From hbr@mailman.qth.net  Sun May  5 04:59:18 2002
From: hbr@mailman.qth.net (Sandy and Kees Talen)
Date: Sat, 4 May 2002 22:59:18 -0500
Subject: [HBR] Small 100Khz IF transformers
Message-ID: <20020504.225926.-384103.14.windy10605@juno.com>

Just got through testing a few JW Miller 15-H, K-TRAN, 262Khz
IF transformers. These are the small 3/4" square units (same 
physical size as used on the HBR-11/12/13). These were 
originally designed for 6BE6 and 6BA6 IF tubes.  

Coil inductance actually goes from about 2mH to 6mH which really 
surprises me that it will go that high. They are set at approx 3.5mH 
for the 262Khz frequency. The resonating capacitor integtated into
the base ranges from 80-95pf.  
 
The coils are very densely wound (something I can't do yet with the 
coil winder) using approx 37 feet of #40 wire (not bifilar .....which
surprises me a little). There is no room to add windings to the 
diameter of the coil (will contact the powdered iron cup), but there is 
a possibility of adding additional turns to the ends of the coil. The 
cup provides higher permeability and self shielding, something the 
JW Miller #1710 and #1709 don't have, requiring a flexible powdered 
iron material inside the can.

At 95% of the maximum inductance (should be lower to allow tuning 
room) the coil "Q" is "74" which is very close to what the 100Khz 
JW miller IFs measure.

Calculations show that a 430pf padder added to the 80-95pf internal
capacitor will bring it to 100Khz. This is more capacitance than 
I would normally add as additional padder, however the starting 
point is 80-95pf. This brings the total to approx 520pf.....that's high. 
The JW Miller 100Khz IFs use 333pf. Need to make some more 
"Q" compares but my JW Miller #1710 is about useless (patched 
broken wires at the coil 3 times) due to the multiple times removing 
it from the can, unsoldering wires, etc.

All the above said, the Spectrum Analyzer does not lie (the real circuit
application would be better) and at -6dB, the BW is 3.8Khz and the 
-20dB BW is 19.2Khz ....really pretty good. The JW Miller #1710 is 
measured at 3.5Khz and 15Khz. You can add another IF stage and 
put two IFs in series (HBR-13). The overall insertion loss is greater 
than the #1710 but .....close enough. 

Since the #1710 and #1709 transformers are "unobtanium", these 
JW Miller 15-H IFs should be more readily available (used in many
car radios) and ought to work ....and they have the cool JW Miller 
label just like the #1710 and #1709.  

73s  Kees K5BCQ



From hbr@mailman.qth.net  Sun May  5 12:20:47 2002
From: hbr@mailman.qth.net (Bob Duckworth, WB4MNF)
Date: Sun, 05 May 2002 07:20:47 -0400
Subject: [HBR] Small 100Khz IF transformers
References: <20020504.225926.-384103.14.windy10605@juno.com>
Message-ID: <3CD5158F.3020106@atl.org>

Kees-

Have you given any thought to using two of these 262 coils?
Place the windings in series on each and wind yourself a link
coil on each, between the windings. Use this link coil as your
coupling between the two tuned circuits. If you experiment a
bit, you can likely stick a cap across the link to vary bandwidth.

I've not built this, just a thought. I get them sometimes
when it's still early in the AM and I've just had my morning coffee :-)

73,
-bob
wb4mnf

Sandy and Kees Talen wrote:

> Just got through testing a few JW Miller 15-H, K-TRAN, 262Khz
> IF transformers. These are the small 3/4" square units (same 
> physical size as used on the HBR-11/12/13). These were 
> originally designed for 6BE6 and 6BA6 IF tubes.  
> 
> Coil inductance actually goes from about 2mH to 6mH which really 
> surprises me that it will go that high. They are set at approx 3.5mH 
> for the 262Khz frequency. The resonating capacitor integtated into
> the base ranges from 80-95pf.  
>  
> The coils are very densely wound (something I can't do yet with the 
> coil winder) using approx 37 feet of #40 wire (not bifilar .....which
> surprises me a little). There is no room to add windings to the 
> diameter of the coil (will contact the powdered iron cup), but there is 
> a possibility of adding additional turns to the ends of the coil. The 
> cup provides higher permeability and self shielding, something the 
> JW Miller #1710 and #1709 don't have, requiring a flexible powdered 
> iron material inside the can.
> 
> At 95% of the maximum inductance (should be lower to allow tuning 
> room) the coil "Q" is "74" which is very close to what the 100Khz 
> JW miller IFs measure.
> 
> Calculations show that a 430pf padder added to the 80-95pf internal
> capacitor will bring it to 100Khz. This is more capacitance than 
> I would normally add as additional padder, however the starting 
> point is 80-95pf. This brings the total to approx 520pf.....that's high. 
> The JW Miller 100Khz IFs use 333pf. Need to make some more 
> "Q" compares but my JW Miller #1710 is about useless (patched 
> broken wires at the coil 3 times) due to the multiple times removing 
> it from the can, unsoldering wires, etc.
> 
> All the above said, the Spectrum Analyzer does not lie (the real circuit
> application would be better) and at -6dB, the BW is 3.8Khz and the 
> -20dB BW is 19.2Khz ....really pretty good. The JW Miller #1710 is 
> measured at 3.5Khz and 15Khz. You can add another IF stage and 
> put two IFs in series (HBR-13). The overall insertion loss is greater 
> than the #1710 but .....close enough. 
> 
> Since the #1710 and #1709 transformers are "unobtanium", these 
> JW Miller 15-H IFs should be more readily available (used in many
> car radios) and ought to work ....and they have the cool JW Miller 
> label just like the #1710 and #1709.  
> 
> 73s  Kees K5BCQ
> 
> 
> ************************************
> Visit the HBR Receiver Web Site with over 100 pictures of receivers and 
> construction notes...... via http://www.qsl.net/k5bcq/ 
> 
> Retrieve reflector archived data via http://mailman.qth.net/mailman/listinfo/hbr
> 
> 
> 
> 



From hbr@mailman.qth.net  Sun May  5 15:06:59 2002
From: hbr@mailman.qth.net (hbr@mailman.qth.net)
Date: Sun, 5 May 2002 10:06:59 EDT
Subject: [HBR] Small 100Khz IF transformers
Message-ID: <aa.b07947a.2a069683@aol.com>

In a message dated 5/5/02 7:24:14 AM Eastern Daylight Time, bob@atl.org 
writes:

> Have you given any thought to using two of these 262 coils?
>  Place the windings in series on each and wind yourself a link
>  coil on each, between the windings. Use this link coil as your
>  coupling between the two tuned circuits. If you experiment a
>  bit, you can likely stick a cap across the link to vary bandwidth.

Better yet, try this:

Connect the two coils in series-aiding but leave one end of the winding free 
(may require destruction of the internal capacitors). Use "bottom coupling" 
like in the DC-500 receiver to obtain adjustable bandwidth. The DC-500 
claimed bandwidths suitable for AM, SSB and CW from 50 kc. IFs made from TV 
width coils, whose Q is probably not as good as the Miller IFs. 
  
>  I've not built this, just a thought. I get them sometimes
>  when it's still early in the AM and I've just had my morning coffee :-)

Great thought, tho!! Only real problem is getting enough of the 262's.

With 2 IF stages and a single transformer feeding the detector, 5 cans would 
be needed - 6 if you use one for the BFO. With 3 IF stages the number jumps 
to 7 and 8, respectively.

73 de Jim, N2EY  

From hbr@mailman.qth.net  Sun May  5 17:18:25 2002
From: hbr@mailman.qth.net (Sandy and Kees Talen)
Date: Sun, 5 May 2002 11:18:25 -0500
Subject: Fw: Re: [HBR] Small 100Khz IF transformers
Message-ID: <20020505.111831.-164121.5.windy10605@juno.com>

I just tried puting the two coils in the 262Khz JW Miller 15-H
in series and you get approx 10mH ....that's expected. This 
and a 250pf capacitor provides resonance at 100Khz. Only 
thing is that with the windings, when connected so they are 
in the same direction, or connected so they are bucking, 
results in a "Q" of 62-64 ......less than the previous measurements. 
I would guess it has something to do with the coil spacing ? 
or the physical design of K-TRAN transformers ? 

All Q measurements are made without any internal/external 
capacitors except for what's in the Q meter and stray 
capacitance to the shield, etc.

73s  Kees K5BCQ  

--------- Forwarded message ----------
From: N2EY@aol.com
To: hbr@mailman.qth.net
Date: Sun, 5 May 2002 10:06:59 EDT
Subject: Re: [HBR] Small 100Khz IF transformers
Message-ID: <aa.b07947a.2a069683@aol.com>

In a message dated 5/5/02 7:24:14 AM Eastern Daylight Time, bob@atl.org 
writes:

> Have you given any thought to using two of these 262 coils?
>  Place the windings in series on each and wind yourself a link
>  coil on each, between the windings. Use this link coil as your
>  coupling between the two tuned circuits. If you experiment a
>  bit, you can likely stick a cap across the link to vary bandwidth.

Better yet, try this:

Connect the two coils in series-aiding but leave one end of the winding
free 
(may require destruction of the internal capacitors). Use "bottom
coupling" 
like in the DC-500 receiver to obtain adjustable bandwidth. The DC-500 
claimed bandwidths suitable for AM, SSB and CW from 50 kc. IFs made from
TV 
width coils, whose Q is probably not as good as the Miller IFs. 
  
>  I've not built this, just a thought. I get them sometimes
>  when it's still early in the AM and I've just had my morning coffee
:-)

Great thought, tho!! Only real problem is getting enough of the 262's.

With 2 IF stages and a single transformer feeding the detector, 5 cans
would 
be needed - 6 if you use one for the BFO. With 3 IF stages the number
jumps 
to 7 and 8, respectively.

73 de Jim, N2EY  
************************************
Visit the HBR Receiver Web Site with over 100 pictures of receivers and 
construction notes...... via http://www.qsl.net/k5bcq/ 

Retrieve reflector archived data via
http://mailman.qth.net/mailman/listinfo/hbr



From hbr@mailman.qth.net  Sun May  5 20:00:48 2002
From: hbr@mailman.qth.net (Sandy and Kees Talen)
Date: Sun, 5 May 2002 14:00:48 -0500
Subject: [HBR] JW Miller 15-H IFs in series
Message-ID: <20020505.140053.-164121.9.windy10605@juno.com>

Is there something I'm missing on using IF's in series ?

I connect 2 of the subject, retuned to 100Khz, JW Miller, 
15-H, IFs directly together and because of overcoupling see 
a "double hump". This is not necessarily bad because it 
"flat tops" the passband like a crystal filter. The BW goes 
up a little from 3.8Khz to 4.2Khz but the -20dB BW drops 
from 15Khz to 10Khz which is really good.  Using capacitive 
coupling between the IFs of 5-10pf the waveform is a little 
distorted and peaked ....and the -20dB BW goes to 8.5Khz. 
The -6dB BW actually goes up to 4.8Khz.

These are a little more difficult to tune up because it's not
just peaking (on the capacitively coupled ones) it's also
passband shaping. The direct (overcoupled) set is easier 
to tune up because just peaking will get you there.

73s  Kees K5BCQ 

From hbr@mailman.qth.net  Sun May  5 22:24:02 2002
From: hbr@mailman.qth.net (Jeff Noel)
Date: Sun, 5 May 2002 17:24:02 -0400
Subject: [HBR] JW Miller 15-H IFs in series
References: <20020505.140053.-164121.9.windy10605@juno.com>
Message-ID: <001e01c1f47b$4345fee0$7f6a2c42@hppav>

I wonder if JW Miller would make a few?


From hbr@mailman.qth.net  Sun May  5 21:44:34 2002
From: hbr@mailman.qth.net (Robert S. Stein)
Date: Sun, 05 May 2002 13:44:34 -0700
Subject: [HBR] Re: [HomeBrew] JW Miller 15-H IFs in series
References: <20020505.140053.-164121.9.windy10605@juno.com>
Message-ID: <3CD599B2.8070207@earthlink.net>

Kees, the best way to tune overcoupled circuits is to shunt the other 
winding with
a resistor to lower the Q.   For example, temporarily connect  a 1k 
resistor across
the secondary and peak the prmary.  Then do the reverse when peaking the 
secondary.
This should give the optimum passband

73, Bob
w6nbi

Sandy and Kees Talen wrote:

>** HOMEBREW REFLECTOR - Please do NOT cross-post messages to multiple mailing lists on the "To:" or "CC:" line of the e-mail message. **
>
>Is there something I'm missing on using IF's in series ?
>
>I connect 2 of the subject, retuned to 100Khz, JW Miller, 
>15-H, IFs directly together and because of overcoupling see 
>a "double hump". This is not necessarily bad because it 
>"flat tops" the passband like a crystal filter. The BW goes 
>up a little from 3.8Khz to 4.2Khz but the -20dB BW drops 
>from 15Khz to 10Khz which is really good.  Using capacitive 
>coupling between the IFs of 5-10pf the waveform is a little 
>distorted and peaked ....and the -20dB BW goes to 8.5Khz. 
>The -6dB BW actually goes up to 4.8Khz.
>
>These are a little more difficult to tune up because it's not
>just peaking (on the capacitively coupled ones) it's also
>passband shaping. The direct (overcoupled) set is easier 
>to tune up because just peaking will get you there.
>
>73s  Kees K5BCQ 
>_______________________________________________
>HomeBrew mailing list
>HomeBrew@mailman.qth.net
>http://mailman.qth.net/mailman/listinfo/homebrew
>



From hbr@mailman.qth.net  Mon May  6 17:11:48 2002
From: hbr@mailman.qth.net (William L. Hopkins)
Date: Mon, 06 May 2002 12:11:48 -0400
Subject: [HBR] Mystery cans
References: <20020505.140053.-164121.9.windy10605@juno.com>
Message-ID: <02May6.121919edt.119159@gateway.naz.edu>

Hello all,

At the Antique Wireless Association (AWA) Spring Meet on Saturday, May 4, in East
Bloomfield NY (Rochester), I picked up a couple of IF cans in rather good
condition.  One has the number in black ink stamped on it "1851" and the other
"1852."  They are identical in size.  The cans are 1 3/8 inches square and 3 inches
high.  Each has two slug tuning capabilities on the top of the can.  Anyone know
what these are good for?

ciao
bill hopkins
AA2YV


Sandy and Kees Talen wrote:

> Is there something I'm missing on using IF's in series ?
>
> I connect 2 of the subject, retuned to 100Khz, JW Miller,
> 15-H, IFs directly together and because of overcoupling see
> a "double hump". This is not necessarily bad because it
> "flat tops" the passband like a crystal filter. The BW goes
> up a little from 3.8Khz to 4.2Khz but the -20dB BW drops
> from 15Khz to 10Khz which is really good.  Using capacitive
> coupling between the IFs of 5-10pf the waveform is a little
> distorted and peaked ....and the -20dB BW goes to 8.5Khz.
> The -6dB BW actually goes up to 4.8Khz.
>
> These are a little more difficult to tune up because it's not
> just peaking (on the capacitively coupled ones) it's also
> passband shaping. The direct (overcoupled) set is easier
> to tune up because just peaking will get you there.
>
> 73s  Kees K5BCQ
> ************************************
> Visit the HBR Receiver Web Site with over 100 pictures of receivers and
> construction notes...... via http://www.qsl.net/k5bcq/
>
> Retrieve reflector archived data via http://mailman.qth.net/mailman/listinfo/hbr

--
For Study-Abroad Website in Berlin, click on:
   http://www.studienforum-berlin.de



--- StripMime Report -- processed MIME parts ---
multipart/mixed
  text/plain (text body -- kept)
  text/x-vcard
The reason this message is shown is because the post was in HTML
or had an attachment. Attachments are not allowed.
Please post in Plain-Text only.---

From hbr@mailman.qth.net  Mon May  6 17:16:52 2002
From: hbr@mailman.qth.net (Mike Feher)
Date: Mon, 06 May 2002 12:16:52 -0400
Subject: [HBR] Mystery cans
References: <20020505.140053.-164121.9.windy10605@juno.com>
 <02May6.121919edt.119159@gateway.naz.edu>
Message-ID: <013001c1f519$6ff06ea0$d2775243@n4fs>

They sure sound like units out of the ARC-5 series. 73 - Mike




Mike B. Feher, N4FS
89 Arnold Blvd.
Howell NJ, 07731
(732) 901-9193


----- Original Message -----
From: "William L. Hopkins" <wlhopkin@naz.edu>
To: <hbr@mailman.qth.net>
Sent: Monday, May 06, 2002 12:11 PM
Subject: [HBR] Mystery cans


> Hello all,
>
> At the Antique Wireless Association (AWA) Spring Meet on Saturday, May 4,
in East
> Bloomfield NY (Rochester), I picked up a couple of IF cans in rather good
> condition.  One has the number in black ink stamped on it "1851" and the
other
> "1852."  They are identical in size.  The cans are 1 3/8 inches square and
3 inches
> high.  Each has two slug tuning capabilities on the top of the can.
Anyone know
> what these are good for?
>
> ciao
> bill hopkins
> AA2YV
>
>
> Sandy and Kees Talen wrote:
>
> > Is there something I'm missing on using IF's in series ?
> >
> > I connect 2 of the subject, retuned to 100Khz, JW Miller,
> > 15-H, IFs directly together and because of overcoupling see
> > a "double hump". This is not necessarily bad because it
> > "flat tops" the passband like a crystal filter. The BW goes
> > up a little from 3.8Khz to 4.2Khz but the -20dB BW drops
> > from 15Khz to 10Khz which is really good.  Using capacitive
> > coupling between the IFs of 5-10pf the waveform is a little
> > distorted and peaked ....and the -20dB BW goes to 8.5Khz.
> > The -6dB BW actually goes up to 4.8Khz.
> >
> > These are a little more difficult to tune up because it's not
> > just peaking (on the capacitively coupled ones) it's also
> > passband shaping. The direct (overcoupled) set is easier
> > to tune up because just peaking will get you there.
> >
> > 73s  Kees K5BCQ
> > ************************************
> > Visit the HBR Receiver Web Site with over 100 pictures of receivers and
> > construction notes...... via http://www.qsl.net/k5bcq/
> >
> > Retrieve reflector archived data via
http://mailman.qth.net/mailman/listinfo/hbr
>
> --
> For Study-Abroad Website in Berlin, click on:
>    http://www.studienforum-berlin.de
>
>
>
> --- StripMime Report -- processed MIME parts ---
> multipart/mixed
>   text/plain (text body -- kept)
>   text/x-vcard
> The reason this message is shown is because the post was in HTML
> or had an attachment. Attachments are not allowed.
> Please post in Plain-Text only.---
> ************************************
> Visit the HBR Receiver Web Site with over 100 pictures of receivers and
> construction notes...... via http://www.qsl.net/k5bcq/
>
> Retrieve reflector archived data via
http://mailman.qth.net/mailman/listinfo/hbr
>
>


From hbr@mailman.qth.net  Mon May  6 18:07:17 2002
From: hbr@mailman.qth.net (LORNE BARBER)
Date: Mon, 6 May 2002 10:07:17 -0700
Subject: [HBR] WTB IF cans
Message-ID: <001001c1f520$8adecb60$9bbb17cf@default.sunwave.net>

Require two Command set IF cans and bases only. Any frequency,
any model.   Do not need electronics.
Using 85 khz command IF's and for cosmetic reasons I  would
like to house the first IF in the same type of can.

73
Lorne
VE7BOX


From hbr@mailman.qth.net  Mon May  6 16:59:21 2002
From: hbr@mailman.qth.net (Sandy and Kees Talen)
Date: Mon, 6 May 2002 10:59:21 -0500
Subject: [HBR] Mystery cans
Message-ID: <20020506.105925.-167607.0.windy10605@juno.com>

I think Mike is correct.......

If they have 6 pins in a circular pattern on the bottom,
either solder pins or a mica wafer with 6 sockets, it's
an ARC-5 can (one of the little command sets). If it 
has leads or 4 pins it's something else, maybe military, 
maybe not. Generally a LOT of "old stuff" is war surplus
or comes from war surplus. The frequency should be 
stamped on them. If not, find out what pins the coils are
connected to, hook a signal generator across one coil
and a scope across the other coil (doesn't matter which
one) and see what frequency it peaks at. Or you can 
measure the coil and the resonating capacitor and 
calculate the frequency. ARC-5 cans do have two top 
adjustments but they are (excellent) air trimmers. 

Kees

From hbr@mailman.qth.net  Mon May  6 17:06:04 2002
From: hbr@mailman.qth.net (Sandy and Kees Talen)
Date: Mon, 6 May 2002 11:06:04 -0500
Subject: [HBR] WTB IF cans
Message-ID: <20020506.110609.-167607.2.windy10605@juno.com>

Boy, can I help you out. I have some of those 10Mhz? ARC-5
IFs which are useless to me.

Do you, or anyone else, happen to have the Nov 1945 QST ? 
I neen to confirm what that "21 Tube Receiver" is ...Darrell 
may have one.

Kees

From hbr@mailman.qth.net  Mon May  6 18:35:00 2002
From: hbr@mailman.qth.net (Mike Feher)
Date: Mon, 06 May 2002 13:35:00 -0400
Subject: [HBR] WTB IF cans
References: <20020506.110609.-167607.2.windy10605@juno.com>
Message-ID: <016b01c1f524$5a779a20$d2775243@n4fs>

The November '45 issue of QST describes a 21 tube "All-Purpose Receiver" It
is supposed to combine the features of the HRO and Super-Pro for ham use and
at the same time be able to provide "Hi-Fidelity" equivalent to a Scott. It
has a pair of 45s in the audio output and even a preamp to hook up to a
phono. From a quick glance it appears to be single conversion, with a
phasing type crystal filter, that can be bypassed. It has two power
supplies, one just for the audio output and the other for the rest of the
set. Besides the phono input and the mike input it also has a recorder
output, so, you can see how the tube count really adds up. You need a
magnifier to read the schematic. Well, at least I do, HI.

I kind of remember those P/Ns being from command set IFs. Right now I do not
know where my box of about 50 of them are, HI. 73 - Mike




Mike B. Feher, N4FS
89 Arnold Blvd.
Howell NJ, 07731
(732) 901-9193


----- Original Message -----
From: "Sandy and Kees Talen" <windy10605@juno.com>
To: <hbr@mailman.qth.net>
Sent: Monday, May 06, 2002 12:06 PM
Subject: Re: [HBR] WTB IF cans


> Boy, can I help you out. I have some of those 10Mhz? ARC-5
> IFs which are useless to me.
>
> Do you, or anyone else, happen to have the Nov 1945 QST ?
> I neen to confirm what that "21 Tube Receiver" is ...Darrell
> may have one.
>
> Kees
> ************************************
> Visit the HBR Receiver Web Site with over 100 pictures of receivers and
> construction notes...... via http://www.qsl.net/k5bcq/
>
> Retrieve reflector archived data via
http://mailman.qth.net/mailman/listinfo/hbr
>
>


From hbr@mailman.qth.net  Wed May  8 00:50:59 2002
From: hbr@mailman.qth.net (Bob Duckworth, WB4MNF)
Date: Tue, 07 May 2002 19:50:59 -0400
Subject: Fw: Re: [HBR] Small 100Khz IF transformers
References: <20020505.111831.-164121.5.windy10605@juno.com>
Message-ID: <3CD86863.7080703@atl.org>

Kees-

Did you measure the DC resistance
and is it enough to account for most of the
difference in Q?

-bob

Sandy and Kees Talen wrote:

> I just tried puting the two coils in the 262Khz JW Miller 15-H
> in series and you get approx 10mH ....that's expected. This 
> and a 250pf capacitor provides resonance at 100Khz. Only 
> thing is that with the windings, when connected so they are 
> in the same direction, or connected so they are bucking, 
> results in a "Q" of 62-64 ......less than the previous measurements. 
> I would guess it has something to do with the coil spacing ? 
> or the physical design of K-TRAN transformers ? 
> 
> All Q measurements are made without any internal/external 
> capacitors except for what's in the Q meter and stray 
> capacitance to the shield, etc.
> 
> 73s  Kees K5BCQ  
> 
> --------- Forwarded message ----------
> From: N2EY@aol.com
> To: hbr@mailman.qth.net
> Date: Sun, 5 May 2002 10:06:59 EDT
> Subject: Re: [HBR] Small 100Khz IF transformers
> Message-ID: <aa.b07947a.2a069683@aol.com>
> 
> In a message dated 5/5/02 7:24:14 AM Eastern Daylight Time, bob@atl.org 
> writes:
> 
> 
>>Have you given any thought to using two of these 262 coils?
>> Place the windings in series on each and wind yourself a link
>> coil on each, between the windings. Use this link coil as your
>> coupling between the two tuned circuits. If you experiment a
>> bit, you can likely stick a cap across the link to vary bandwidth.
>>
> 
> Better yet, try this:
> 
> Connect the two coils in series-aiding but leave one end of the winding
> free 
> (may require destruction of the internal capacitors). Use "bottom
> coupling" 
> like in the DC-500 receiver to obtain adjustable bandwidth. The DC-500 
> claimed bandwidths suitable for AM, SSB and CW from 50 kc. IFs made from
> TV 
> width coils, whose Q is probably not as good as the Miller IFs. 
>   
> 
>> I've not built this, just a thought. I get them sometimes
>> when it's still early in the AM and I've just had my morning coffee
>>
> :-)
> 
> Great thought, tho!! Only real problem is getting enough of the 262's.
> 
> With 2 IF stages and a single transformer feeding the detector, 5 cans
> would 
> be needed - 6 if you use one for the BFO. With 3 IF stages the number
> jumps 
> to 7 and 8, respectively.
> 
> 73 de Jim, N2EY  
> ************************************
> Visit the HBR Receiver Web Site with over 100 pictures of receivers and 
> construction notes...... via http://www.qsl.net/k5bcq/ 
> 
> Retrieve reflector archived data via
> http://mailman.qth.net/mailman/listinfo/hbr
> 
> 
> ************************************
> Visit the HBR Receiver Web Site with over 100 pictures of receivers and 
> construction notes...... via http://www.qsl.net/k5bcq/ 
> 
> Retrieve reflector archived data via http://mailman.qth.net/mailman/listinfo/hbr
> 
> 
> 
> 



From hbr@mailman.qth.net  Wed May  8 01:27:31 2002
From: hbr@mailman.qth.net (Sandy and Kees Talen)
Date: Tue, 7 May 2002 19:27:31 -0500
Subject: Fw: Re: Fw: Re: [HBR] Small 100Khz IF transformers
Message-ID: <20020507.192736.-108355.6.windy10605@juno.com>

Bob,

Probably more than you asked for........ I added a few comments 
which I know is "old hat" to you but might be interesting for the 
rest of the group ....and maybe get some additional discussion 
going.

The DC resistance of the 262Khz 15-H IF coils is 41 ohms and 
they are wound with 1 strand of #40. The resistance of the 100Khz 
#1710 coil is 53 ohms and the winding is made up of bifilar #40 
or #41....hard to tell. Each wire has a resistance of 105 ohms.
The inductance of the #1710 is, of course, higher ...it goes from 
3.3-9.3mH and resonance with the integrated 333pf capacitor is 
at 6.4mH. The 15-H range is about 2.0-6.0mh and is set at 5.0mH
which dictates 520pf. The #1710 coil is larger in diameter (due to 
the two wires and more wire) and the RF resistance should be 
less due to the increased surface area of bifilar wire, but there is 
more of it which increases the RF resistance. RF resistance 
below 2-3Mhz plays a substantial factor in coil Q....that's why all
those old broadcast radios used plenty of Litz wire in the frontend. 
Then they got enough stations all over the place and the need fell
off ....I guess that's why.

   
The one thing that still causes some question is those Q numbers 
are the "unloaded Q" measurements of the coil on a Q meter. The 
"loaded Q", between the two, may well change that. I don't like the 
fact of adding 520pf total for resonance vs 333pf total on the 
#1710. One better indication of overall performance of the whole 
transformer and "Q" would be to see how much of a peak relative 
to the noise floor you can get on the Spectrum Analyzer. I have 
always looked at "Q" as supplying a higher voltage peak vs a 
sharper peak ....they don't necessarily go hand in hand. In other 
words, everyone is talking about -6dB BW and you might have a 
-6dB BW of 4Khz on one and 3Khz on the other, yet the peak of 
the 4Khz might be 60dB above the noise floor and the 3Khz might 
be 40dB above the noise floor. That's where those BC-453 IFs 
really excell. 

Maybe that should just be looked at as insertion loss and add 
another IF stage ?? I don't think so. If the gain of a stage is 
typically around 150, that's about +40dB. ....but with amplifiers 
they do just that ...amplify and everything goes up, signal, noise 
floor, etc ....and they add "stuff".   

73s  Kees K5BCQ

--------- Forwarded message ----------
From: "Bob Duckworth, WB4MNF" <bob@atl.org>
To: hbr@mailman.qth.net
Date: Tue, 07 May 2002 19:50:59 -0400
Subject: Re: Fw: Re: [HBR] Small 100Khz IF transformers
Message-ID: <3CD86863.7080703@atl.org>
References: <20020505.111831.-164121.5.windy10605@juno.com>

Kees-

Did you measure the DC resistance
and is it enough to account for most of the
difference in Q?

-bob

Sandy and Kees Talen wrote:

> I just tried puting the two coils in the 262Khz JW Miller 15-H
> in series and you get approx 10mH ....that's expected. This 
> and a 250pf capacitor provides resonance at 100Khz. Only 
> thing is that with the windings, when connected so they are 
> in the same direction, or connected so they are bucking, 
> results in a "Q" of 62-64 ......less than the previous measurements. 
> I would guess it has something to do with the coil spacing ? 
> or the physical design of K-TRAN transformers ? 
> 
> All Q measurements are made without any internal/external 
> capacitors except for what's in the Q meter and stray 
> capacitance to the shield, etc.
> 
> 73s  Kees K5BCQ  
> 
> --------- Forwarded message ----------
> From: N2EY@aol.com
> To: hbr@mailman.qth.net
> Date: Sun, 5 May 2002 10:06:59 EDT
> Subject: Re: [HBR] Small 100Khz IF transformers
> Message-ID: <aa.b07947a.2a069683@aol.com>
> 
> In a message dated 5/5/02 7:24:14 AM Eastern Daylight Time, bob@atl.org

> writes:
> 
> 
>>Have you given any thought to using two of these 262 coils?
>> Place the windings in series on each and wind yourself a link
>> coil on each, between the windings. Use this link coil as your
>> coupling between the two tuned circuits. If you experiment a
>> bit, you can likely stick a cap across the link to vary bandwidth.
>>
> 
> Better yet, try this:
> 
> Connect the two coils in series-aiding but leave one end of the winding
> free 
> (may require destruction of the internal capacitors). Use "bottom
> coupling" 
> like in the DC-500 receiver to obtain adjustable bandwidth. The DC-500 
> claimed bandwidths suitable for AM, SSB and CW from 50 kc. IFs made
from
> TV 
> width coils, whose Q is probably not as good as the Miller IFs. 
>   
> 
>> I've not built this, just a thought. I get them sometimes
>> when it's still early in the AM and I've just had my morning coffee
>>
> :-)
> 
> Great thought, tho!! Only real problem is getting enough of the 262's.
> 
> With 2 IF stages and a single transformer feeding the detector, 5 cans
> would 
> be needed - 6 if you use one for the BFO. With 3 IF stages the number
> jumps 
> to 7 and 8, respectively.
> 
> 73 de Jim, N2EY  
> ************************************
> Visit the HBR Receiver Web Site with over 100 pictures of receivers and

> construction notes...... via http://www.qsl.net/k5bcq/ 
> 
> Retrieve reflector archived data via
> http://mailman.qth.net/mailman/listinfo/hbr
> 
> 
> ************************************
> Visit the HBR Receiver Web Site with over 100 pictures of receivers and

> construction notes...... via http://www.qsl.net/k5bcq/ 
> 
> Retrieve reflector archived data via
http://mailman.qth.net/mailman/listinfo/hbr
> 
> 
> 
> 


************************************
Visit the HBR Receiver Web Site with over 100 pictures of receivers and 
construction notes...... via http://www.qsl.net/k5bcq/ 

Retrieve reflector archived data via
http://mailman.qth.net/mailman/listinfo/hbr



From hbr@mailman.qth.net  Wed May  8 02:34:30 2002
From: hbr@mailman.qth.net (Sandy and Kees Talen)
Date: Tue, 7 May 2002 20:34:30 -0500
Subject: Fw: Re: Fw: Re: [HBR] Small 100Khz IF transformers
Message-ID: <20020507.203435.-108355.7.windy10605@juno.com>

I did the last destructive test on the one coil remaining on the
JW Miller 100Khz #1710 IF transformer. It's 62ft of wire ...and 
at 105 ohms per wire that works out to be bifilar #42 AWG. 
It also says the #1710 transformer is good for 18ma DC.

Difficult to measure down that far with calipers and unknown
insulation.

73s  Kees K5BCQ


From hbr@mailman.qth.net  Wed May  8 14:47:25 2002
From: hbr@mailman.qth.net (Freeberg, Scott (STP))
Date: Wed, 8 May 2002 08:47:25 -0500
Subject: [HBR] My New Old HBR
Message-ID: <1D1B8647FA5CD411A02800508BDFD0A002F693B9@stpmsx03.stp.guidant.com>

Hi,

While pinging the boatanchor lists about homebrew receivers a few weeks
back, someone offered to sell me a complete HBR-16.  I figured the parts
alone were worth more than the asking price so went ahead and bought it.  If
it were a piece of junk then I'd just strip the parts and use them to build
a new one.  The HBR arrived yesturday.  It came with three sets of coils
(maybe four since I don't remember if I counted the ones already plugged
in), so I guessing I might be looking at 80m, 40, 20 or 15 meters.   These
are not junky coils either, very well built!    It has a National
rectangular 180 degree dial setup, the Collins style knobs with wide skirts,
one pointer knob just to the right of the National vernier, or actually
through the National vernier plate.

Its a nice looking radio!  I haven't pulled the chassis out of the cabinet
for a closer look but were these chassis professionally made??    The
chassis construction is incredible.  The chassis looks commercial in that I
don't see all the marks and scratches that my homebrew projects show.  The
chassis is covered in grime and dust so I'll get it cleaned out tomorrow and
take a closer look.    I saw a reference in the K8ENL notes about someone
selling all the parts for the HBR so thats why I was wondering about a kit.
Then again, maybe only the mechanically talented took on the HBR project and
thats why they look so great.  I'll take some photo's once its clean up and
ask Kees to put them up on the HBR website.   I pulled one coil out of the
socket, ceramic socket no less.  

I don't know who the builder was and I've not seen a callsign anywhere yet.
I've asked the seller if he might know the builder.  Maybe there's a call
under the chassis.

BY the way,  I'm printing out the 36 pages of K8ENL notes.  It has taken me
two days so far :^)   It takes a while for each page to load so I've been
doing it as a background task.  Every so often I check the page to see if
its loaded, then print it and move on to the next page.  :^))  I'm on page
33 so far.
I am also printing out the HBR schematics and other notes so I can check the
receiver out this weekend.  

There is no power cord on the HBR, just what appears to be a 4 pin Johnson
style connector with some smaller gauge wires hanging off it, the type that
is on the back of the 250-33 10 Watt Speech Amplifier.  At first I wondered
if the HV and filament were outboard but the power transformer is sitting
there in the rear right cornet and a fuse holder is on the back.  I'll power
it up this weekend and see whats going on.

I see photo's of the Eddystone 898 (?) dial assembly on some of the HBR's.
What a great looking dial.  I would like to buy one if a listmember has a
spare for sale.    Thanks.

Hmm, now I have a dilemma, I want to build my own HBR and this ones too nice
to gut.  So I guess I'll have to start collecting my own parts :^)

73,  Scott WA9WFA in Saint Paul Minn

From hbr@mailman.qth.net  Wed May  8 15:00:05 2002
From: hbr@mailman.qth.net (Sandy and Kees Talen)
Date: Wed, 8 May 2002 09:00:05 -0500
Subject: [HBR] My New Old HBR
Message-ID: <20020508.090013.-345337.2.windy10605@juno.com>

Can't wait for the pictures, Scott. Certainly is good to hear
of another one rescued and being put back into service.
Proves again that they are out there ....you just have to beat
the bushes (or the reflectors) and keep beating the bushes. 
The workmanship sounds outstanding. There certainly were/
are some talented (mechanically and electrically) people out
there. Maybe someone will find Bill McKay's, Bill Hillard's, or 
one of Ted Crosby's original units.  

Before you power it up, you might give it a careful check 
underneath and definitely power it up the first time through 
a variac or put a light bulb in series ....anything to slowly 
reform the electrolytics before you apply full power. Having the 
rectifier "tube" is also easier on the unit than rectifier "diodes". 

As far as a commercial chassis, I'm not aware of any ??

73s  Kees K5BCQ 

From hbr@mailman.qth.net  Wed May  8 19:05:42 2002
From: hbr@mailman.qth.net (Jeff Noel)
Date: Wed, 8 May 2002 14:05:42 -0400
Subject: [HBR] My New Old HBR
References: <1D1B8647FA5CD411A02800508BDFD0A002F693B9@stpmsx03.stp.guidant.com>
Message-ID: <001301c1f6bb$0d76eee0$2b2d2c42@hppav>

Scott,
I am waiting to see the pictures of your new/old HBR.

Jeff


From hbr@mailman.qth.net  Wed May  8 19:42:51 2002
From: hbr@mailman.qth.net (William L. Hopkins)
Date: Wed, 08 May 2002 14:42:51 -0400
Subject: [HBR] My New Old HBR
References: <1D1B8647FA5CD411A02800508BDFD0A002F693B9@stpmsx03.stp.guidant.com>
Message-ID: <02May8.145024edt.119080@gateway.naz.edu>

Hey all,

I would like to know about the 36 page information packet by K8ENL.  Does this make
sense?

ciao
bill hopkins AA2YV



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From hbr@mailman.qth.net  Wed May  8 20:11:02 2002
From: hbr@mailman.qth.net (Freeberg, Scott (STP))
Date: Wed, 8 May 2002 14:11:02 -0500
Subject: [HBR] RE:  ED Kent K8ENL Notes
Message-ID: <1D1B8647FA5CD411A02800508BDFD0A002F693BA@stpmsx03.stp.guidant.com>

Hi Bill,

The 36 page info I mentioned is on the HBR website.  It is 36 pages of HBR
notes written by Ed Kent K8ENL.  There is a ton of notes and recommendations
on the HBR circuitry, coil winding, etc...   The URL is:
http://www.qsl.net/k5bcq/Doc1/
It does take a bit of time to get at it but its worth it!

73, Scott WA9WFA

From hbr@mailman.qth.net  Wed May  8 19:38:41 2002
From: hbr@mailman.qth.net (Sandy and Kees Talen)
Date: Wed, 8 May 2002 13:38:41 -0500
Subject: [HBR] RE:  ED Kent K8ENL Notes
Message-ID: <20020508.133851.-345337.9.windy10605@juno.com>

Ed Kent's notes are item #12 in the "HBR Receiver Pictures/Data"
section of the HBR Web Site (at the end of the list).

For those providing pictures, please keep the size to about 50KB
or they take too long to upload/download and too much storage
space on Allan Waller's system. On my Sony Mavica the 640x480
mode works great. The little "e-mail" 13KB pictures are too small
and the >100KB ones are too large.

I'll also be adding some pictures of Darrell's 21 tube receiver.

73s  Kees K5BCQ 

From hbr@mailman.qth.net  Wed May  8 20:56:20 2002
From: hbr@mailman.qth.net (hbr@mailman.qth.net)
Date: Wed, 8 May 2002 15:56:20 EDT
Subject: [HBR] My New Old HBR
Message-ID: <16d.d4fd7eb.2a0adce4@aol.com>

If you want to sell one, let me know.  I have always wanted to build one, but 
have not ever had the time` Mike W0LTL in Tucson, AZ 


--- StripMime Report -- processed MIME parts ---
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The reason this message is shown is because the post was in HTML
or had an attachment. Attachments are not allowed.
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From hbr@mailman.qth.net  Wed May  8 23:46:38 2002
From: hbr@mailman.qth.net (Byron Tatum)
Date: Wed, 8 May 2002 17:46:38 -0500
Subject: [HBR] Eddystone Dials
Message-ID: <00e401c1f6e2$3806dc20$dfcddacf@tatum001>

Hello-
    I have made a parts buy { various tube gear building parts} and have one
each of these Eddystone dials as extras to trade for HBR parts :
    # 598, as new, with all parts, instructions and template
    # 898, ditto
        Actually, both of these dials have been placed on a front panel and
never used, then pulled off and returned to storage.
    I am also interested in parts for the Bill Orr receiver { DX Receiver,
16th edition, I believe}. The Miller coils and IF transformers have not
turned up for me anywhere as of yet. Miller B-727, B-727C, S-27 shields,
912-C2,912-C4, 912-C5 .
    Anyway, thought I would throw my hat in the ring. Thanks, Byron, WA5THJ.


From hbr@mailman.qth.net  Wed May  8 22:50:03 2002
From: hbr@mailman.qth.net (Sandy and Kees Talen)
Date: Wed, 8 May 2002 16:50:03 -0500
Subject: [HBR] Eddystone Dials
Message-ID: <20020508.165006.-345337.11.windy10605@juno.com>

Bet you get a few e-mails on that parts list, Byron.

I have the 17th edition which has Bill Hillard's "Deluxe HBR
Receiver". Tell us some more about the Bill Orr "DX Receiver"
...... tube lineup, receiver chacteristics, etc.

73s  Kees K5BCQ

From hbr@mailman.qth.net  Thu May  9 00:27:55 2002
From: hbr@mailman.qth.net (Sandy and Kees Talen)
Date: Wed, 8 May 2002 18:27:55 -0500
Subject: [HBR] If you need some gears
Message-ID: <20020508.182801.-345337.12.windy10605@juno.com>

Here is a web site if you are making a mechanical tuning system 
and need some gears, etc to match up.

http://www.sdp-si.com/Component_Cat.htm  

Kees   

From hbr@mailman.qth.net  Sat May 11 02:09:19 2002
From: hbr@mailman.qth.net (Sandy and Kees Talen)
Date: Fri, 10 May 2002 20:09:19 -0500
Subject: [HBR] JW Miller IF transformers
Message-ID: <20020510.200927.-169843.4.windy10605@juno.com>

You have probably followed some of the information on converting
JW Miller (and others) K-Tran 262Khz IFs to 100Khz for use in the 
smaller HBR units. These are like the #1710 transformers.

I received some JW Miller 262Khz #90-PHP transformers which 
are identical electrically to the JW Miller 262Khz #15-H transformers 
I tested earlier. Only difference is 2 extra pins for detector filter 
capacitors (not used) and the shield has PC board mounting, not 
the K-Tran clip and the can will need to be grounded. These 
transformers are available from  JMarsh1014@aol.com  I believe 
he has a qty of them and maybe some others. You can contact 
him directly.

Just use pins 1,2,3,and 4, add a 430pf SM padder capacitor and 
adjust the powdered iron cap all the way in and back it out 1-1/2 turns. 
Makes a good 100Khz transformer very much like the JW Miller 
#1710. The spectrum analyzer plots are close.....the #1710 being
slightly better. If you put two in series the passband is excellent with 
steep skirts (at -20dB it's only 10Khz wide). A single #1710 is about
15-18Khz wide at -20dB. 

I'm trying a few other things like substituting two coils in series to
increase Q and I've seen some improvement but I don't think the 
extra work is worth the improvement .......it's nothing like using
two IF transformers in series.

73s  Kees K5BCQ


From hbr@mailman.qth.net  Sat May 11 17:58:42 2002
From: hbr@mailman.qth.net (Sandy and Kees Talen)
Date: Sat, 11 May 2002 11:58:42 -0500
Subject: [HBR] HBR Receiver parts
Message-ID: <20020511.115846.-108957.0.windy10605@juno.com>

The difficult to find parts for a HBR Receiver are the FM variable 
capacitor, the IF transformers, and the coil forms.

For the coil forms, an excellent solution is to use the 1-1/4" amber
pill containers or PVC. Attach a plug of your choice and only the 
osc coil socket should be ceramic for electrical stability. Testing 
(on the web site) has shown that the "Q" of coils wound on these 
forms is very close to that of the Amphenol coil forms. There ARE
other materials which are worse (ANY paper based product) or 
slightly better (ceramic). The winding adhesive DOES have an 
effect on "Q" (on the web site).

For the IF transformers, BC-453 85Khz IFs are great if you have
the room for the large cans. If you want to use the smaller 3/4"
cans, modified 262Khz IFs adjusted for more inductance and 
with 430pf padder capacitors seems to work well (previous 
discussions). 

For the tuning capacitor, the one offered by BG Micro was excellent
(three section with 7-27pf per section) but they are no longer
available from BG Micro. Since these are modern manufacture, it's
only a matter of time before someone finds a source of these again. 
There is another possible solution from the guy below. These are 
six section tuning capacitors. Section 3 and 6 are 5-21pf and 
section 4 can be modified to match sections 3 and 6 by removing 
one rotor plate and one stator plate. The range of 5-21pf will require 
some coil turn adjustment so the whole band can be covered. If 
you want more capacitance removing all the rotor plates except one 
between two stator plates on sections 1 and 2 provides 6-35pf 
each. Section 5 is a little more difficult due to the size of the plates
and gives 7-36pf if you remove all but two of the rotor plates ....but
the tracking will be different from sections 1 and 2. This will give
you more than an adequate tuning range for all bands, but I'd go
with the 5-21pf sections and adjust the coils if you can. The only 
drawback is that this capacitor has maximum capacitance fully 
clockwise, so the low end of the band would be to the right unless 
you design the dial drive. Both the BG Micro capacitor and this one 
are PC board mount variables and have 1/4" shafts.

Other subject........ 
How about a receiver based around some of the later articles (double
tuned frontend, low noise front end mixer, designed for 3-5-4Mhz with 
crystal converters for the other bands, etc), 262Khz IFs (retuned for 
256Khz), 256Khz Collins Mechanical filter #526-9700 (cheap, 
because no one knows what to do with a 256Khz filter), hang audio 
AGC, Q multiplier ....and naturally tubes (preferably no 7360s ....too
difficult to find for less than $25 and it won't decrease).

73s  Kees K5BCQ
  

-------- Forwarded message ----------
From: "I. Cannon" <ctrak04t@prodigy.net>
To: <windy10605@juno.com>
Subject: 1348464684 Large Multi Section Variable Capacitor (4)


Yes have more of these. Sold in pkgs/4 as listed on ebay at $16.00 for
first
pkg, and $15.00 thereafter. Ebay bid is not required, but please refer to
this same item number if ordering. Thanks.



From hbr@mailman.qth.net  Sun May 12 00:59:31 2002
From: hbr@mailman.qth.net (Sandy and Kees Talen)
Date: Sat, 11 May 2002 18:59:31 -0500
Subject: [HBR] more pictures
Message-ID: <20020511.185938.-108957.9.windy10605@juno.com>

Pictures of Darrell's  21 tube, triple conversion, receiver have
been uploaded to the web site. If anyone recognizes the 
receiver and where/when/if it was published, we'd all like 
to know. Heck of a receiver for it's apparent age (octal tubes).

73s  Kees K5BCQ 

From hbr@mailman.qth.net  Sun May 12 11:01:06 2002
From: hbr@mailman.qth.net (Jeff Noel)
Date: Sun, 12 May 2002 06:01:06 -0400
Subject: [HBR] more pictures
References: <20020511.185938.-108957.9.windy10605@juno.com>
Message-ID: <000701c1f99b$efd5d520$67292c42@hppav>

Kees,

Saw the pictures of Darrell's 21 tube receiver. Looks like it was built last
week,  real clean no rust and pitting of the chassis. A lot of work went
into this one.
 Wonder how Darrell found the receiver?

Jeff


From hbr@mailman.qth.net  Sun May 12 13:23:59 2002
From: hbr@mailman.qth.net (Eddy Swynar)
Date: Sun, 12 May 2002 08:23:59 -0400
Subject: [HBR] Eddystone Dials
References: <00e401c1f6e2$3806dc20$dfcddacf@tatum001>
Message-ID: <000001c1f9b1$6bf91c60$e3d549c6@greg>

Hi Byron...

I think you're in luck by virtue of the fact that the price of Eddystone 898
dials seems to be DROPPING on eBay, of late...

One auction just closed the other day for less than $60.00---the previous
one a month ago sold for just over $100.00! Both were new items, never
used...

I was lucky & found mine by posting "Wanteds" on different Reflectors/swap
sites---traded a variable inductor for it. Both items were used, but the
"swapper" & the "swappee" are VERY pleased with the deal! Hi Hi

~73~ Eddy VE3CUI - VE3XZ





----- Original Message -----
From: "Byron Tatum" <bjtatum@ev1.net>
To: <hbr@mailman.qth.net>
Sent: Wednesday, May 08, 2002 6:46 PM
Subject: [HBR] Eddystone Dials


> Hello-
>     I have made a parts buy { various tube gear building parts} and have
one
> each of these Eddystone dials as extras to trade for HBR parts :
>     # 598, as new, with all parts, instructions and template
>     # 898, ditto
>         Actually, both of these dials have been placed on a front panel
and
> never used, then pulled off and returned to storage.
>     I am also interested in parts for the Bill Orr receiver { DX Receiver,
> 16th edition, I believe}. The Miller coils and IF transformers have not
> turned up for me anywhere as of yet. Miller B-727, B-727C, S-27 shields,
> 912-C2,912-C4, 912-C5 .
>     Anyway, thought I would throw my hat in the ring. Thanks, Byron,
WA5THJ.
>
> ************************************
> Visit the HBR Receiver Web Site with over 100 pictures of receivers and
> construction notes...... via http://www.qsl.net/k5bcq/
>
> Retrieve reflector archived data via
http://mailman.qth.net/mailman/listinfo/hbr


From hbr@mailman.qth.net  Sun May 12 15:24:55 2002
From: hbr@mailman.qth.net (john)
Date: Sun, 12 May 2002 10:24:55 -0400
Subject: [HBR] more pictures
In-Reply-To: <20020511.185938.-108957.9.windy10605@juno.com>
Message-ID: <3.0.3.32.20020512102455.01e2a8f4@pop-server.nc.rr.com>

What a beautiful rig!

Would love to hear details as they become available. The craftsmanship
is fantastic....

John



At 06:59 PM 5/11/02 -0500, you wrote:
>Pictures of Darrell's  21 tube, triple conversion, receiver have
>been uploaded to the web site. If anyone recognizes the 
>receiver and where/when/if it was published, we'd all like 
>to know. Heck of a receiver for it's apparent age (octal tubes).
>
>73s  Kees K5BCQ 
>************************************
>Visit the HBR Receiver Web Site with over 100 pictures of receivers and 
>construction notes...... via http://www.qsl.net/k5bcq/ 
>
>Retrieve reflector archived data via
http://mailman.qth.net/mailman/listinfo/hbr
>
>

From hbr@mailman.qth.net  Sun May 12 21:06:39 2002
From: hbr@mailman.qth.net (hbr@mailman.qth.net)
Date: Sun, 12 May 2002 16:06:39 EDT
Subject: [HBR] more pictures
Message-ID: <96.26697aed.2a10254f@aol.com>

In a message dated 5/11/02 10:14:47 PM Eastern Daylight Time, 
windy10605@juno.com writes:

> Pictures of Darrell's  21 tube, triple conversion, receiver have
>  been uploaded to the web site. 

Nice piece of work! 

> If anyone recognizes the 
>  receiver and where/when/if it was published, we'd all like 
>  to know. 

This much I know: It was never in QST or the ARRL Handbook.
The last IF looks to be very similar to the DCS-500, using "width coils"
at 50 kHz.  

>Heck of a receiver for it's apparent age (octal tubes).

It could be much newer than the tube types would indicate. The Eddystone
dial appeared in the late 1950s or so, long after miniatures were all over the
place. The bakelite in the Miller coils, and their label style, indicates 
they are
relatively "new" (if one can say a quarter century plus is "new"). The chassis
arrangement, internal power supply and front panel layout appear to be 
HBR-16 inspired. There may also be a bit of HB-65/67 influence.

Looks like the Unknown Builder combined lots of good ideas into a masterpiece.
As for the use of metal tubes, the Builder probably had big piles of them, 
with 
good sockets to match. No headaches with shields, and for many uses there is
no performance advantage to miniatures. For example, for AF output use,
a 6AQ5 is just a mini-6V6 that can't be pushed quite so hard. 

I am old enough to remember when all of the parts to build such a project 
could
be picked up at a hamfest for relatively few dollars, because things like B&W
TV width coils, 6K8s and even 898 dials were considered "junk". The Builder 
may have taken advantage of this.

My best guess is that the RX was built in the late 1960s or early 1970s.

Some questions:

- How well does it work?
- What's the mixing scheme (IF frequencies, etc.)?
- Schematic, block diagram, other info?

Thanks for the photos and info. Warms the ol' ticker to know such things 
exist.

73 de Jim, N2EY

From hbr@mailman.qth.net  Sun May 12 13:16:23 2002
From: hbr@mailman.qth.net (Sandy and Kees Talen)
Date: Sun, 12 May 2002 07:16:23 -0500
Subject: [HBR] yet more pictures
Message-ID: <20020512.071630.-346731.5.windy10605@juno.com>

Also uploaded pictures of Darrell's HBR-16 (original builder K5RPZ)
This looks like a really nice one showing the backlit 180 degree dial
(Eddystone 598 and National ICN). Front panel has the typical labels
of the time.

73s  Kees K5BCQ

From hbr@mailman.qth.net  Sun May 12 23:26:23 2002
From: hbr@mailman.qth.net (john)
Date: Sun, 12 May 2002 18:26:23 -0400
Subject: [HBR] yet more pictures
In-Reply-To: <20020512.071630.-346731.5.windy10605@juno.com>
Message-ID: <3.0.3.32.20020512182623.01a5d1e0@pop-server.nc.rr.com>

It's fantastic that so many of these were saved and are coming to light.
Would be fascinating (but  impossible) to know how many were built. There
was a tremendous investment in time (and a not insignificant amount of
money) that went into each of these.  

I think your site Kees, has likely sparked considerable interest in finding
and restoring these wonderful old radios...

John WB5OAU

From hbr@mailman.qth.net  Sun May 12 15:15:09 2002
From: hbr@mailman.qth.net (Sandy and Kees Talen)
Date: Sun, 12 May 2002 09:15:09 -0500
Subject: Fw: Re: [HBR] yet more pictures
Message-ID: <20020512.091603.-400629.1.windy10605@juno.com>

>I think your site Kees, has likely sparked considerable interest in
finding
>and restoring these wonderful old radios...

>John WB5OAU
************************************


I hope so ...that (and building them from scratch today) was the idea
after 
talking to Lorne Barber and Bob Cole. The original thought was that we 
might find a dozen via the Internet and QST ads........at the very
outside.

Other homebrew radios (Darrell's 21 tube receiver is a good example, 
as are the HB 65/67 and DCS-500) are also satisfying to discover and 
bring back into the light, but the HBRs are so well known. I'd estimate 
80% of the people who have been hams for a number of years remember 
reading about or talking about an HBR Receiver, whether they built one 
or not. 

I also think people building a matching transmitter (SSB and/or CW),
as Lorne Barber is doing, is an excellent idea.

Just keep spreading the word ....there are more out there.
 
Kees

From hbr@mailman.qth.net  Mon May 13 03:53:24 2002
From: hbr@mailman.qth.net (Sandy and Kees Talen)
Date: Sun, 12 May 2002 21:53:24 -0500
Subject: [HBR] HBR design
Message-ID: <20020512.215328.-391957.3.windy10605@juno.com>

Let me ask you a question, Jim. Why wouldn't you use 
6BH6 tubes vs the 6BJ6 in the IF amplifiers ....same
grid 1 to plate capacitance, higher transconductance,
same plate/screen requirements, same filament power,
......adjust the bias and go. 6BH6 tubes are very plentiful
today.

Kees K5BCQ

From hbr@mailman.qth.net  Mon May 13 12:15:53 2002
From: hbr@mailman.qth.net (hbr@mailman.qth.net)
Date: Mon, 13 May 2002 07:15:53 EDT
Subject: [HBR] HBR design
Message-ID: <86.1a7577a4.2a10fa69@aol.com>

In a message dated 5/12/02 10:53:44 PM Eastern Daylight Time, 
windy10605@juno.com writes:

> Let me ask you a question, Jim. Why wouldn't you use 
>  6BH6 tubes vs the 6BJ6 in the IF amplifiers ....same
>  grid 1 to plate capacitance, higher transconductance,
>  same plate/screen requirements, same filament power,
>  ......adjust the bias and go.

6BJ6 is remote cutoff, 6BH6 is sharp cutoff. 

> 6BH6 tubes are very plentiful today.

They were used as limiters in Motorola and other mobile FM gear. 

--

Sharp cutoff tubes can replace their remote cutoff counterparts in a pinch, 
but there will be some changes in performance. AGC and MGC will be affected 
by the fact that it takes far less bias change to go from full gain to no 
gain with sharp cutoff tubes. Dynamic range and big-signal handling will 
suffer because the sharp cutoff tubes will be easier to push into the 
nonlinear region. 

Tube makers produced many "remote/sharp" pairs. Here are a few:

6BJ6/6BH6
6BA6/6AU6
6EH7/6EJ7
6SK7/6SJ7
6K7/6J7
6D6/6C6
78/77
58/57

to name just a few.

73 de Jim, N2EY 

From hbr@mailman.qth.net  Mon May 13 14:20:27 2002
From: hbr@mailman.qth.net (Sandy and Kees Talen)
Date: Mon, 13 May 2002 08:20:27 -0500
Subject: [HBR] HBR design
Message-ID: <20020513.082031.-388483.1.windy10605@juno.com>


From hbr@mailman.qth.net  Mon May 13 15:39:36 2002
From: hbr@mailman.qth.net (Freeberg, Scott (STP))
Date: Mon, 13 May 2002 09:39:36 -0500
Subject: [HBR] My New Old HBR
Message-ID: <1D1B8647FA5CD411A02800508BDFD0A002F693C7@stpmsx03.stp.guidant.com>

HBR Friends,

I took Thursday and Friday off last week for some 'radio days'.  I spent
several hours Thursday cleaning up my newly acquired HBR-16 that arrive in
the mail earlier in the week.  I pulled the chassis out of the cabinet.
There was dust and stuck on grime in there but no rust or corrosion. The
chassis cleaned up shiny and bright, same for the tube shields.   

The chassis and front panel construction is top notch and very professional
looking.  I put the cabinet in the basement sink and scrubbed it with soap
and water.  It came out looking good.  After it dried I followed up up with
an application of WD-40 on the entire cabinet surface.  WB-40 replenishes
the moisture in the dried out paint and brings back the lusture.  I don't
know, is it natural for an HBR to have a 'lusture' ??   Maybe only fancy
schmancy radios have lusture :^)   The knobs are the same ones from the QST
article with the exception of having dial skirts on them.  The knobs cleaned
up fine.  The radio looks great.  It is almost an exact copy of the original
HBR photo's on Kees website. 

I disconnected the ac power receptacle on the chassis rear and put on a 3
wire cord.  I didn't even need to drill a hole for the power cord. There was
a grommeted hole just waiting for it. Its show time.  The HBR powered up
right away and I was surprised to hear good sounding signals on 40 meters.
I put the 20 meter coils in and spent a couple of hours listening to 20
meter cw and ssb.  The radio appears to be stable, the cw signals sounded
very good, meaning good tone quality, good frequency response.  The National
dial tuning is alot heavier than I like.  I did grease up the mechanism but
it didn't make a noticeable difference.  I ran some brief side by side
comparisions with my Collins 75S3B and I found the HBR to be as sensitive as
the 3B on all signals that I compared.  I'll put the URM25D signal generator
on and see how sensitive it is.  I copied quite a bit of 20 meter cw DX that
day.  There is something special listening to cw on a homebrew receiver,
even if it was built by someone else!! It must sound even more special when
you build it yourself. 

There is a weak signal present all the time that I need to attenuate or
eliminate.  To avoid it, I adjusted the BFO to zero beat it out.  It
probably has something to do with the the first or 2nd oscillator.  I need
to review my receiver theory.  Its after the RF amp because the RF gain does
not affect it, but before the mixer state because the signal is amplified
along with everything else when the mixer gain is adjusted.

No coils were mentioned when I bought the radio so I assumed I'd be winding
my own.  I was pleasantly surprised to find 4 sets of coils, 10, 15, 20, 40
meters.  All in all I am really impressed with the radio and it will be a
pleasure to put on the air.

I just about blew my ear drums out that first time.  I plugged my headphones
in the rear jack that I thought was for the phones.  I know I know (now) its
for the speaker.  Anyway, nothing came out so I switched the front panel
speaker/headphone switch to speaker.  The volume was set high........
Ouch....

I'll take some close up photos and ask Kees to put them on his website.  

I don't know who built the radio.  The seller didn't know and I didn't find
any name or callsign on the cabinet or chassis.  Too bad as it would have
been fun to find out who made it.  He did an incredible job.

So just as I'm starting to get excited about all this homebrew stuff, Eddy
Swynar VE3CUI - VE3XZ sent me 8 emails containing 16 photos of his homebrew
receiver, transmitter, and vfo.  I think Eddys trying to motivate me.   Now
there is a gorgeous well made homebrew station.  Eddy is a master builder
and has built a beautiful station.  
I just gotta build me some of that :^)   Thanks Eddy.

73,  Scott WA9WFA
Proud HBR-16 owner, Hopeful HBR-13 builder

From hbr@mailman.qth.net  Mon May 13 15:58:34 2002
From: hbr@mailman.qth.net (Diane Swynar)
Date: Mon, 13 May 2002 10:58:34 -0400 (EDT)
Subject: [HBR] My New Old HBR
In-Reply-To: <1D1B8647FA5CD411A02800508BDFD0A002F693C7@stpmsx03.stp.guidant.com>
References: <1D1B8647FA5CD411A02800508BDFD0A002F693C7@stpmsx03.stp.guidant.com>
Message-ID: <7710.198.208.223.35.1021301914.squirrel@webmail.durham.net>

Hi Scot...

Many thanks for all the kind words!

~73~ Eddy VE3CUI - VE3XZ




> HBR Friends,
>
> I took Thursday and Friday off last week for some 'radio days'.  I
> spent several hours Thursday cleaning up my newly acquired HBR-16 that
> arrive in the mail earlier in the week.  I pulled the chassis out of
> the cabinet. There was dust and stuck on grime in there but no rust or
> corrosion. The chassis cleaned up shiny and bright, same for the tube
> shields.
>
> The chassis and front panel construction is top notch and very
> professional looking.  I put the cabinet in the basement sink and
> scrubbed it with soap and water.  It came out looking good.  After it
> dried I followed up up with an application of WD-40 on the entire
> cabinet surface.  WB-40 replenishes the moisture in the dried out paint
> and brings back the lusture.  I don't know, is it natural for an HBR to
> have a 'lusture' ??   Maybe only fancy schmancy radios have lusture :^)
>   The knobs are the same ones from the QST article with the exception
> of having dial skirts on them.  The knobs cleaned up fine.  The radio
> looks great.  It is almost an exact copy of the original HBR photo's on
> Kees website.
>
> I disconnected the ac power receptacle on the chassis rear and put on a
> 3 wire cord.  I didn't even need to drill a hole for the power cord.
> There was a grommeted hole just waiting for it. Its show time.  The HBR
> powered up right away and I was surprised to hear good sounding signals
> on 40 meters. I put the 20 meter coils in and spent a couple of hours
> listening to 20 meter cw and ssb.  The radio appears to be stable, the
> cw signals sounded very good, meaning good tone quality, good frequency
> response.  The National dial tuning is alot heavier than I like.  I did
> grease up the mechanism but it didn't make a noticeable difference.  I
> ran some brief side by side comparisions with my Collins 75S3B and I
> found the HBR to be as sensitive as the 3B on all signals that I
> compared.  I'll put the URM25D signal generator on and see how
> sensitive it is.  I copied quite a bit of 20 meter cw DX that day.
> There is something special listening to cw on a homebrew receiver, even
> if it was built by someone else!! It must sound even more special when
> you build it yourself.
>
> There is a weak signal present all the time that I need to attenuate or
> eliminate.  To avoid it, I adjusted the BFO to zero beat it out.  It
> probably has something to do with the the first or 2nd oscillator.  I
> need to review my receiver theory.  Its after the RF amp because the RF
> gain does not affect it, but before the mixer state because the signal
> is amplified along with everything else when the mixer gain is
> adjusted.
>
> No coils were mentioned when I bought the radio so I assumed I'd be
> winding my own.  I was pleasantly surprised to find 4 sets of coils,
> 10, 15, 20, 40 meters.  All in all I am really impressed with the radio
> and it will be a pleasure to put on the air.
>
> I just about blew my ear drums out that first time.  I plugged my
> headphones in the rear jack that I thought was for the phones.  I know
> I know (now) its for the speaker.  Anyway, nothing came out so I
> switched the front panel speaker/headphone switch to speaker.  The
> volume was set high........ Ouch....
>
> I'll take some close up photos and ask Kees to put them on his website.
>
>
> I don't know who built the radio.  The seller didn't know and I didn't
> find any name or callsign on the cabinet or chassis.  Too bad as it
> would have been fun to find out who made it.  He did an incredible job.
>
> So just as I'm starting to get excited about all this homebrew stuff,
> Eddy Swynar VE3CUI - VE3XZ sent me 8 emails containing 16 photos of his
> homebrew receiver, transmitter, and vfo.  I think Eddys trying to
> motivate me.   Now there is a gorgeous well made homebrew station.
> Eddy is a master builder and has built a beautiful station.
> I just gotta build me some of that :^)   Thanks Eddy.
>
> 73,  Scott WA9WFA
> Proud HBR-16 owner, Hopeful HBR-13 builder
> ************************************
> Visit the HBR Receiver Web Site with over 100 pictures of receivers and
>  construction notes...... via http://www.qsl.net/k5bcq/
>
> Retrieve reflector archived data via
> http://mailman.qth.net/mailman/listinfo/hbr




From hbr@mailman.qth.net  Mon May 13 16:49:37 2002
From: hbr@mailman.qth.net (Sandy and Kees Talen)
Date: Mon, 13 May 2002 10:49:37 -0500
Subject: [HBR] HBR design
Message-ID: <20020513.104940.-289955.3.windy10605@juno.com>

Since there were a couple of requests, here is some additional 
information from Darrell on the 21 tube receiver. Looking forward to 
more.

Also put some better front and chassis pictures on the web site.

Kees

===========================================
It is band switched from 80 to 10 meters and has variable selectivity. It
also has a notch filter, hang agc and both product and envelope
detectors.
It uses a total of 21 tubes.In spite of the fact that it has all octal
tubes, I believe it was most likely constructed in the early 60's. The
receiver is triple conversion with a 1900-2400 KC tunable IF followed by
455
KC and 50 KC fixed IF's. I have been unable to find the circuit in any
text.
I suspect the builder took classic circuits from many sources and
combined
them.
===========================================

From hbr@mailman.qth.net  Mon May 13 18:46:52 2002
From: hbr@mailman.qth.net (LORNE BARBER)
Date: Mon, 13 May 2002 10:46:52 -0700
Subject: [HBR] My New Old HBR
Message-ID: <002f01c1fab1$39c2aee0$aabb17cf@default.sunwave.net>

Sure be nice if we could all look at Eddy's  handiwork.

73
Lorne 
Ve7box


From hbr@mailman.qth.net  Mon May 13 23:19:53 2002
From: hbr@mailman.qth.net (Jeff Noel)
Date: Mon, 13 May 2002 18:19:53 -0400
Subject: [HBR] HBR design
References: <20020513.082031.-388483.1.windy10605@juno.com>
Message-ID: <003801c1facc$4f360fe0$14692c42@hppav>

Lorne,

Where can I find the schematic for the HBTX that you are building?
I think it would go well with the  HBR16 on the desk.

Jeff 


From hbr@mailman.qth.net  Tue May 14 03:30:18 2002
From: hbr@mailman.qth.net (LORNE BARBER)
Date: Mon, 13 May 2002 19:30:18 -0700
Subject: [HBR] HBR design
Message-ID: <006d01c1faef$91ac4b00$aabb17cf@default.sunwave.net>

Jeff, the transmitter I am building is from Orr's Radio
Handbook, 17 edition starting on page 624.
I have made some  modifications such as VOX circuitry, CW
sidetone, single 6146 final with a multi band tuner.
I can provide more details by direct email if you like .
Power is from a Heath HP23.
73
Lorne
Ve7box


From hbr@mailman.qth.net  Tue May 14 15:59:39 2002
From: hbr@mailman.qth.net (William L. Hopkins)
Date: Tue, 14 May 2002 10:59:39 -0400
Subject: [HBR] My New Old HBR
References: <1D1B8647FA5CD411A02800508BDFD0A002F693C7@stpmsx03.stp.guidant.com>
Message-ID: <02May14.110715edt.119123@gateway.naz.edu>

Dear Scott and Friends,

Funny you should mention the persistent tone that you can zero out by the bfo.
Well, guess what?  I am working on the Heathkit Comanche MR-1 rcvr (in a pair with
the Cheyenne MT-1) that I have promised myself I would spiff up.  I had taken out
the 5 electrolytics and wanted to replace them.  Each was about 8 mfd. at various
voltage ratings.  I replaced the ones close to the 300 volt power source (all are to
ground), but forgot the twin 8-8 mfd caps over between the MIXER and the crystal
filter, going into the first IF.  I had this very loud schriek every time I switched
on the BFO for SSB/CW listening.  Well, my sharp eyes spotted where I had snipped
off the two caps.  Once I replaced them, the problem went away.

So I would suggest you look for open caps (electrolytics) to ground in this area of
your HBR16.  I'll be building my own this summer, so wish me luck.

ciao
bill hopkins
AA2YV
rochester ny


"Freeberg, Scott (STP)" wrote:

> HBR Friends,
>
> I took Thursday and Friday off last week for some 'radio days'.  I spent
> several hours Thursday cleaning up my newly acquired HBR-16 that arrive in
> the mail earlier in the week.  I pulled the chassis out of the cabinet.
> There was dust and stuck on grime in there but no rust or corrosion. The
> chassis cleaned up shiny and bright, same for the tube shields.
>
> The chassis and front panel construction is top notch and very professional
> looking.  I put the cabinet in the basement sink and scrubbed it with soap
> and water.  It came out looking good.  After it dried I followed up up with
> an application of WD-40 on the entire cabinet surface.  WB-40 replenishes
> the moisture in the dried out paint and brings back the lusture.  I don't
> know, is it natural for an HBR to have a 'lusture' ??   Maybe only fancy
> schmancy radios have lusture :^)   The knobs are the same ones from the QST
> article with the exception of having dial skirts on them.  The knobs cleaned
> up fine.  The radio looks great.  It is almost an exact copy of the original
> HBR photo's on Kees website.
>
> I disconnected the ac power receptacle on the chassis rear and put on a 3
> wire cord.  I didn't even need to drill a hole for the power cord. There was
> a grommeted hole just waiting for it. Its show time.  The HBR powered up
> right away and I was surprised to hear good sounding signals on 40 meters.
> I put the 20 meter coils in and spent a couple of hours listening to 20
> meter cw and ssb.  The radio appears to be stable, the cw signals sounded
> very good, meaning good tone quality, good frequency response.  The National
> dial tuning is alot heavier than I like.  I did grease up the mechanism but
> it didn't make a noticeable difference.  I ran some brief side by side
> comparisions with my Collins 75S3B and I found the HBR to be as sensitive as
> the 3B on all signals that I compared.  I'll put the URM25D signal generator
> on and see how sensitive it is.  I copied quite a bit of 20 meter cw DX that
> day.  There is something special listening to cw on a homebrew receiver,
> even if it was built by someone else!! It must sound even more special when
> you build it yourself.
>
> There is a weak signal present all the time that I need to attenuate or
> eliminate.  To avoid it, I adjusted the BFO to zero beat it out.  It
> probably has something to do with the the first or 2nd oscillator.  I need
> to review my receiver theory.  Its after the RF amp because the RF gain does
> not affect it, but before the mixer state because the signal is amplified
> along with everything else when the mixer gain is adjusted.
>
> No coils were mentioned when I bought the radio so I assumed I'd be winding
> my own.  I was pleasantly surprised to find 4 sets of coils, 10, 15, 20, 40
> meters.  All in all I am really impressed with the radio and it will be a
> pleasure to put on the air.
>
> I just about blew my ear drums out that first time.  I plugged my headphones
> in the rear jack that I thought was for the phones.  I know I know (now) its
> for the speaker.  Anyway, nothing came out so I switched the front panel
> speaker/headphone switch to speaker.  The volume was set high........
> Ouch....
>
> I'll take some close up photos and ask Kees to put them on his website.
>
> I don't know who built the radio.  The seller didn't know and I didn't find
> any name or callsign on the cabinet or chassis.  Too bad as it would have
> been fun to find out who made it.  He did an incredible job.
>
> So just as I'm starting to get excited about all this homebrew stuff, Eddy
> Swynar VE3CUI - VE3XZ sent me 8 emails containing 16 photos of his homebrew
> receiver, transmitter, and vfo.  I think Eddys trying to motivate me.   Now
> there is a gorgeous well made homebrew station.  Eddy is a master builder
> and has built a beautiful station.
> I just gotta build me some of that :^)   Thanks Eddy.
>
> 73,  Scott WA9WFA
> Proud HBR-16 owner, Hopeful HBR-13 builder
> ************************************
> Visit the HBR Receiver Web Site with over 100 pictures of receivers and
> construction notes...... via http://www.qsl.net/k5bcq/
>
> Retrieve reflector archived data via http://mailman.qth.net/mailman/listinfo/hbr

--
For Study-Abroad Website in Berlin, click on:
   http://www.studienforum-berlin.de



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From hbr@mailman.qth.net  Mon May 20 20:05:20 2002
From: hbr@mailman.qth.net (Sandy and Kees Talen)
Date: Mon, 20 May 2002 14:05:20 -0500
Subject: [HBR] 100Khz IF transformers
Message-ID: <20020520.140935.-273699.5.windy10605@juno.com>

After a "few" tries, I finally succeeded in making replacement 
3/4" square 100Khz IF transformers which actually look a little 
better than the JW Miller #1710 parts. It's a relatively easy 
convert from 262Khz K-Tran IFs, but you have to increase 
inductance (screw the tuning cups towards each other) while 
not creating an over coupling situation (separate the tuning cups).

Details on the HBR web site.

73s  Kees K5BCQ

From hbr@mailman.qth.net  Tue May 21 01:18:04 2002
From: hbr@mailman.qth.net (Sandy and Kees Talen)
Date: Mon, 20 May 2002 19:18:04 -0500
Subject: [HBR] HBR tuning cap
Message-ID: <20020520.191806.-264237.3.windy10605@juno.com>

Ray, N3XZV, told me about another possibility for a HBR variable
capacitor from
C and H Sales, stock # VACAP9400  for $5.00    http://www.candhsales.com
so I ordered some. They have a minimum order of $30 or they charge
another
fee.

* It has 5 sections approx 8-37pf per section ....little on the high side

* Ball bearing in front, single ball in back (adjustable) ....good
* Made in 1965 (Viet Nam era war surplus) .....good stuff
* Very sturdy/heavy frame construction and silver plated ......well built
* Each section has a silver rotary slip contact for grounding
....excellent
   but causes drag on the capacitor shaft.
* Physical size is in line with the JW Miller variable ....good 
* Removing the center rotor plate gives 6-30pf per section ....better
* Right angle shaft is 3/16" dia, 3/16" long, internally threaded, 
  and driving an anti-backlash right angle bevel gear with a 2:1 ratio
  .....this will require some thinking on how to use it
* If you remove the gears (difficult to do with a cold chisel and 
  other tools since the staking pins wouldn't budge), you end up 
  with a 3/16" dia 5/8" long in-line shaft ....better, add a bushing to
1/4" 
* The stator sections are on ceramic which is mounted via
  screws on fiber washers to the frame. It's nice to have the 
  screw adjustment, but after nearly 40 years, some of the 
  screws are loose  .....not a problem.   
* After nearly 40 years the bearing grease needs replacing ....not a
problem
* Don't apply force (hammer type) in line with the shaft when trying to
  remove the gears, you'll ruin the ball bearings ....one down

Hey, hey, with a 5 section variable you could have a double tuned
frontend
and really get some frontend strong signal rejection.
  
73s  Kees K5BCQ


From hbr@mailman.qth.net  Thu May 23 15:14:07 2002
From: hbr@mailman.qth.net (Bob Duckworth, WB4MNF)
Date: Thu, 23 May 2002 10:14:07 -0400
Subject: [HBR] Some homebrew slide rule dials, not mine.
References: <LOBBJHOLOOHLIPLONIAFCELEFCAA.sieb@sympatico.ca>
Message-ID: <3CECF92F.1050809@atl.org>

Sorry for being so scarce (someone missed me :-)


Here is a mess of photos.

Purpose of presentation is two fold.

1) Look at the really nice homebrew dials
on the two receivers.


Homebrew short-wave 'receiver' with nice
string drive, slide rule dial.
http://edebris.com/catalog2/item/225

Homebrew two meter 'receiver' with nice
string drive, slide rule dial.
http://edebris.com/catalog2/item/226

Homebrew I.F. for above receivers
http://edebris.com/catalog2/item/228


Remainder of rescued homebrew stuff.
HB PS for TCS ?
http://edebris.com/catalog2/item/237

Homebrew stereo amp
http://edebris.com/catalog2/item/236

HB monitor scope
http://edebris.com/catalog2/item/235

Ant couplers
http://edebris.com/catalog2/item/234

Modified TCS AM/CW transmitter
http://edebris.com/catalog2/item/233

assorted HB stuff
http://edebris.com/catalog2/item/231

HB PS for receiver ?
http://edebris.com/catalog2/item/230


2) I'm looking for a home for this stuff.

Rescued, via swap for some new ham gear,
from a leaky shed. Has been in the
'future projects' pile for much too
long and there is no way I'm moving this
into a small apt.


-bob


From hbr@mailman.qth.net  Thu May 23 15:56:37 2002
From: hbr@mailman.qth.net (Bob Duckworth, WB4MNF)
Date: Thu, 23 May 2002 10:56:37 -0400
Subject: [HBR] Re: GB> Some homebrew slide rule dials, not mine.
References: <LOBBJHOLOOHLIPLONIAFCELEFCAA.sieb@sympatico.ca> <3CECF92F.1050809@atl.org>
Message-ID: <3CED0325.5030503@atl.org>

Looking for a home for the lot, not individual pieces.

Bob Duckworth, WB4MNF wrote:


> 
> 2) I'm looking for a home for this stuff.
> 

> -bob




From hbr@mailman.qth.net  Fri May 31 20:57:35 2002
From: hbr@mailman.qth.net (Jeff Noel)
Date: Fri, 31 May 2002 15:57:35 -0400
Subject: [HBR] colis
Message-ID: <001701c208dd$7d77e800$7e6a2c42@hppav>

I found a couple of coils in the junk box. I believe they are Heathkit.
The part number is 40-746 and 40-747 mounted in 3/4 inch regular IF cans.
Can anyone tell me what these coils are for or any other info?

Thanks,

Jeff

k4zku@erols.com


