From kbgluxford at fastmail.fm  Sun Aug 12 22:34:32 2007
From: kbgluxford at fastmail.fm (KBG Luxford)
Date: Sun Aug 12 22:45:05 2007
Subject: [HBR] Hi Guys
Message-ID: <46BFC338.6030503@fastmail.fm>

Just signed up to the reflector.
Hi to all!

73
Kevin
VK3DAP / ZL2DAP
From windy10605 at juno.com  Sun Aug 12 23:35:20 2007
From: windy10605 at juno.com (Kees & Sandy)
Date: Sun Aug 12 23:48:08 2007
Subject: [HBR] Hi Guys
Message-ID: <20070812.223520.18252.0@webmail11.dca.untd.com>

Well hello to you too, Kevin. Do you have a HBR receiver or are building one ?
73 Kees K5BCQ


-- KBG Luxford <kbgluxford@fastmail.fm> wrote:
Just signed up to the reflector.
Hi to all!

73
Kevin
VK3DAP / ZL2DAP
************************************
Visit the HBR Receiver Web Site with over 100 pictures of receivers and 
construction notes...... via http://www.qsl.net/k5bcq/ 
there is also a mirror (faster response)at http://k5bcq.edebris.com/
 

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

From kbgluxford at fastmail.fm  Mon Aug 13 04:28:55 2007
From: kbgluxford at fastmail.fm (KBG Luxford)
Date: Mon Aug 13 04:39:32 2007
Subject: [HBR] Hi Guys
In-Reply-To: <20070812.223520.18252.0@webmail11.dca.untd.com>
References: <20070812.223520.18252.0@webmail11.dca.untd.com>
Message-ID: <46C01647.8070708@fastmail.fm>

Hi Kees,

Firstly, thanks for putting together your wonderful site.

No I do not have an HBR receiver nor have I started to build one.  I am 
retired now, I am a graduate electrical engineer, but in my day, we were 
immersed in heavy machines rather than electronics.  So I am trying to 
make up for my lack of knowledge by building home brew receivers and 
learning as I go.

When I was a schoolboy, I built a double conversion superhet (1600 KHz 
and 100 KHz IF frequencies) on a piece of Al sheet.  No chassis.  It was 
propped up against the wooden leg of the spare bed in my room.  I hope 
to do a little bit better with my current efforts.

My humungous power supply is just about completed - just have to add the 
delay circuit to switch on the plate transformer after the heaters are 
good and hot.  This will power a receiver and a moderate transmitter 
(possibly a pair of 807s in the final).

I have a number of possible paths for the receiver.  I have a heap of 
spares for my NZ Army ZC1 MK II transceiver, including 465 KHz IF 
transformers.  So one way to go is to build a more updated version of 
the ZC1 receiver with better selectivity and a product detector for SSB 
reception.

Another would be to experiment with triode cascode RF amplifiers for 15 
and 10 mx, various types of mixer, noise silencer and Q-mult circuits. 
As I know very little about receiver design, and intend learning the 
"suck and see" way, I have in mind using a Hammond Al chassis as a base, 
and placing on it standard strips consisting of Al sheet strips about 2" 
wide screwed to Al C section.  Now with a template fabricated from sheet 
steel, the strips should have their mounting holes identically spaced, 
which should result in easy replacement of a strip should this appear 
desirable.  The C section should give good shielding as well.

I have no doubt that I will plagiarize like mad interesting circuits on 
your site.

Incidentally, I found an old Meissner catalog on someone's web site (may 
have been yours) and this specifies the inductances of their various IF 
transformers.  Very valuable should I have to wind my own!

Well, sorry for the bandwidth, but now you can see broadly where I am 
headed.

Vy 73
Kevin
VK3DAP / ZL2DAP


From amargosaent at iscweb.com  Fri Aug 24 21:09:48 2007
From: amargosaent at iscweb.com (amargosaent@iscweb.com)
Date: Fri Aug 24 21:06:28 2007
Subject: [HBR] PVC coil forms for the W6TC HBR
Message-ID: <46CF815C.1090008@iscweb.com>

Does anyone on the reflector have first-hand experience with, or direct 
knowledge of, the performance of PVC tubing with a typical 0.066-in wall 
thickness in an HF receiver front end application as typified by the 
Crosby HBR?  Floating around in various places on the net there is some 
vague commentary about general unsuitability of PVC for coil forms due 
to "excessive losses".  No specifics are cited, nor linkage to sources, 
and as a result it is then impossible for me to decide if the commentary 
is rumor, speculation, or has some measure of substance.

The reason for the query is my intent to move forward (or perhaps not) 
with some experimental work on HBR coil forms using PVC NMT (non 
metallic electrical tubing) and PVC Schedule 40 pipe parts.  I have a 
preliminary physical design using a standard PVC pipe connector, plus a 
5-pin connector customized from a PVC pipe cap, and a coil winding 
surface using the NMT.  Stability of the physical design looks 
promising, but I would prefer not to waste time on coil experiments if 
there is significant truth to the "PVC excessive loss" story.

My in-house references, texts and ARRL handbooks do not shed useful 
light on the subject.

Any thoughts, anyone?

73 de W6HHT
From windy10605 at juno.com  Fri Aug 24 22:09:41 2007
From: windy10605 at juno.com (Kees & Sandy)
Date: Fri Aug 24 22:11:35 2007
Subject: Fw: Re: [HBR] PVC coil forms for the W6TC HBR
Message-ID: <20070824.210941.28276.5@webmail18.dca.untd.com>

I performed a number of experiments measuring the effect of coil form material, coil dope, wire spacing, winding method, etc on coil "Q" some time ago. It's at the end of the section on "Q Meters" on my web site ....just follow the link at the end of this message.   qsl.net/k5bcq 
Regular schedule 40 PVC was really pretty good. If you have access to a lathe you can turn the ends to perfectly fit old tube sockets and trimmer capacitors, even put rings on the ends.
73 Kees K5BCQ

-- "amargosaent@iscweb.com" <amargosaent@iscweb.com> wrote:
Does anyone on the reflector have first-hand experience with, or direct 
knowledge of, the performance of PVC tubing with a typical 0.066-in wall 
thickness in an HF receiver front end application as typified by the 
Crosby HBR?  Floating around in various places on the net there is some 
vague commentary about general unsuitability of PVC for coil forms due 
to "excessive losses".  No specifics are cited, nor linkage to sources, 
and as a result it is then impossible for me to decide if the commentary 
is rumor, speculation, or has some measure of substance.

The reason for the query is my intent to move forward (or perhaps not) 
with some experimental work on HBR coil forms using PVC NMT (non 
metallic electrical tubing) and PVC Schedule 40 pipe parts.  I have a 
preliminary physical design using a standard PVC pipe connector, plus a 
5-pin connector customized from a PVC pipe cap, and a coil winding 
surface using the NMT.  Stability of the physical design looks 
promising, but I would prefer not to waste time on coil experiments if 
there is significant truth to the "PVC excessive loss" story.

My in-house references, texts and ARRL handbooks do not shed useful 
light on the subject.

Any thoughts, anyone?

73 de W6HHT
************************************
Visit the HBR Receiver Web Site with over 100 pictures of receivers and 
construction notes...... via http://www.qsl.net/k5bcq/ 
there is also a mirror (faster response)at http://k5bcq.edebris.com/
 

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

From w4du at bellsouth.net  Sat Aug 25 10:28:08 2007
From: w4du at bellsouth.net (Ken Evans)
Date: Sat Aug 25 10:28:56 2007
Subject: [HBR] Eddystone 98
Message-ID: <002c01c7e724$290a0570$6501a8c0@D99HQJ91>

Anyone have info on how to re-string an Eddystone 898?

Ken Evans, W4DU
QRP ARCI 696, GQRP 5918, FP 295, NOGA, ARRL Life



From wb6kwt at sbcglobal.net  Sat Aug 25 11:05:33 2007
From: wb6kwt at sbcglobal.net (Bob Miller)
Date: Sat Aug 25 11:05:48 2007
Subject: [HBR] Eddystone 98
In-Reply-To: <002c01c7e724$290a0570$6501a8c0@D99HQJ91>
Message-ID: <DDEHLINJDMOAJLINGKMGOEBBDDAA.wb6kwt@sbcglobal.net>

Ken,

If you will send me your email address, I'll send you a picutre
that may help. The list will not let me send an attachment.

Bob
wb6kwt

-----Original Message-----
From: hbr-bounces@mailman.qth.net [mailto:hbr-bounces@mailman.qth.net]On
Behalf Of Ken Evans
Sent: Saturday, August 25, 2007 7:28 AM
To: hbr@mailman.qth.net
Subject: [HBR] Eddystone 98


Anyone have info on how to re-string an Eddystone 898?

Ken Evans, W4DU
QRP ARCI 696, GQRP 5918, FP 295, NOGA, ARRL Life



************************************
Visit the HBR Receiver Web Site with over 100 pictures of receivers and
construction notes...... via http://www.qsl.net/k5bcq/
there is also a mirror (faster response)at http://k5bcq.edebris.com/


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

From amargosaent at iscweb.com  Sat Aug 25 18:50:25 2007
From: amargosaent at iscweb.com (amargosaent@iscweb.com)
Date: Sat Aug 25 18:47:06 2007
Subject: [HBR] Eddystone 98
In-Reply-To: <002c01c7e724$290a0570$6501a8c0@D99HQJ91>
References: <002c01c7e724$290a0570$6501a8c0@D99HQJ91>
Message-ID: <46D0B231.1030101@iscweb.com>

Ken -

I have original British Radio drawing for Eddy 898 if you want it.  
Shows some, probably not all, detail of string.  Send ur mailing address 
to w6hht@arrl.net and I will forward USPS 1st class

Jay Helms W6HHT

Ken Evans wrote:
> Anyone have info on how to re-string an Eddystone 898?
>
> Ken Evans, W4DU
> QRP ARCI 696, GQRP 5918, FP 295, NOGA, ARRL Life
>
>
>
> ************************************
> Visit the HBR Receiver Web Site with over 100 pictures of receivers and 
> construction notes...... via http://www.qsl.net/k5bcq/ 
> there is also a mirror (faster response)at http://k5bcq.edebris.com/
>  
>
> Retrieve reflector archived data via http://mailman.qth.net/mailman/listinfo/hbr
>
>
>
>   

From w4du at bellsouth.net  Sat Aug 25 22:21:49 2007
From: w4du at bellsouth.net (Ken Evans)
Date: Sat Aug 25 22:22:50 2007
Subject: [HBR] Eddystone 98
In-Reply-To: <46D0B231.1030101@iscweb.com>
References: <002c01c7e724$290a0570$6501a8c0@D99HQJ91>
	<46D0B231.1030101@iscweb.com>
Message-ID: <006901c7e787$dcee6280$6501a8c0@D99HQJ91>

Jay,

Got the info from another ham.

Thanks,

Ken

-----Original Message-----
From: hbr-bounces@mailman.qth.net [mailto:hbr-bounces@mailman.qth.net] On
Behalf Of amargosaent@iscweb.com
Sent: Saturday, August 25, 2007 18:50
To: HBR Receiver List
Subject: Re: [HBR] Eddystone 98

Ken -

I have original British Radio drawing for Eddy 898 if you want it.  
Shows some, probably not all, detail of string.  Send ur mailing address 
to w6hht@arrl.net and I will forward USPS 1st class

Jay Helms W6HHT

Ken Evans wrote:
> Anyone have info on how to re-string an Eddystone 898?
>
> Ken Evans, W4DU
> QRP ARCI 696, GQRP 5918, FP 295, NOGA, ARRL Life
>
>
>
> ************************************
> Visit the HBR Receiver Web Site with over 100 pictures of receivers and 
> construction notes...... via http://www.qsl.net/k5bcq/ 
> there is also a mirror (faster response)at http://k5bcq.edebris.com/
>  
>
> 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/ 
there is also a mirror (faster response)at http://k5bcq.edebris.com/
 

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


From tshoppa at wmata.com  Mon Aug 27 08:45:56 2007
From: tshoppa at wmata.com (Tim  Shoppa)
Date: Mon Aug 27 08:47:11 2007
Subject: [HBR] PVC coil forms for the W6TC HBR
In-Reply-To: <46CF815C.1090008@iscweb.com>
References: <46CF815C.1090008@iscweb.com>
Message-ID: <46D28F44020000370000F9DC@gwiavs.nservices.wmata.com>

W6HHT writes:
> Does anyone on the reflector have first-hand experience with, or direct 
> knowledge of, the performance of PVC tubing with a typical 0.066-in wall 
> thickness in an HF receiver front end application as typified by the 
> Crosby HBR?  Floating around in various places on the net there is some 
> vague commentary about general unsuitability of PVC for coil forms due 
> to "excessive losses".  No specifics are cited, nor linkage to sources, 
> and as a result it is then impossible for me to decide if the commentary 
> is rumor, speculation, or has some measure of substance.

PVC does have comparatively high losses... as compared to say air or vacuum.

This matters a lot if you have a very high-Q tank with multiple kilowatts
flowing around, or a trap in an antenna that you hope will take a killowatt
continuous.

Doesn't matter much in a receiver.

I suspect any slight decrease in Q that comes from using a PVC form as
opposed to the styrene forms is because the PVC tends to be thicker.
I despise styrene forms largely from my frustration when I was a kid
trying to machine and solder to pins stuck in it.

> The reason for the query is my intent to move forward (or perhaps not) 
> with some experimental work on HBR coil forms using PVC NMT (non 
> metallic electrical tubing) and PVC Schedule 40 pipe parts.  I have a 
> preliminary physical design using a standard PVC pipe connector, plus a 
> 5-pin connector customized from a PVC pipe cap, and a coil winding 
> surface using the NMT.  Stability of the physical design looks 
> promising, but I would prefer not to waste time on coil experiments if 
> there is significant truth to the "PVC excessive loss" story.

I have been having good luck with phenolic and glass-epoxy tube in
making custom HBR coils. I used to have a local plastic supply house
that had a retail section with remainders and cutoffs, but they're
not nearly as good as they used to be. Most of my stuff comes from
McMaster-Carr ( http://www.mcmaster.com/ )  recently. But the reason
I use those instead of PVC is the superior machinability of phenolic/
glass-epoxy, the fact that it doesn't melt (and many grades have
flame-suppressing properties) and availability of a wide range of
sizes, no electrical reason.

> My in-house references, texts and ARRL handbooks do not shed useful 
> light on the subject.

You might look at books and articles about antenna traps if you want
to know what happens to lossy coil forms at high power. A couple
have very good pictures of the spectacular results - I remember a QST
or QEX article in the past year or two that actually shows the trap on fire!

Tim.

From n7gtb at yahoo.com  Wed Aug 29 17:27:09 2007
From: n7gtb at yahoo.com (Vern VanZ)
Date: Wed Aug 29 17:28:12 2007
Subject: [HBR] Fw: HBR-16 + RME 45...
Message-ID: <499476.36447.qm@web63302.mail.re1.yahoo.com>

From: Vern VanZ <n7gtb@yahoo.com>

To: hbr@mailman.qth.net

Sent: Wednesday, August 29, 2007 2:04:21 PM

Subject: HBR-16 + RME 45...



Greetings.  



I just joined and wanted to say "hello out there!", and ask:  "Is anyone still building an HBR receiver?"  I've recently begun collecting parts for a variation of the HBR using a case, front panel and tuning dial from an RME 45 and various parts from other 'junked' commercial receivers (i.e.,  Hammarlund HQ-100, Knight R-55, RME 45, etc...).  I think I have most of the needed parts (power supply, main tuning, sockets, etc.), but wondering about (current) sources others may have and still use...(?)  Particularly where the I.F. transformers are concerned...  I've built CW transmitters (both tube and transistor), direct conversion receivers, regens, and just about every other piece of gear in my shack.  Thought it was time to tackle a superhet...  I  had in mind to make it general coverage, but that may be expecting a bit much at this juncture...(?)  I've also been toying with using crystal filters in the I.F....(~10Mhz), but that's still up in the air
 so-to-speak.



p.s.  - I could also use a meter movement for use as an 'S' meter, something that will fit the RME 45...  (i.e. - Square faced, 2 1/8" diameter, four mounting studs).  Anyone have one of those?



Thanks,

-Vern, N7GTB




       
____________________________________________________________________________________
Building a website is a piece of cake. Yahoo! Small Business gives you all the tools to get online.
http://smallbusiness.yahoo.com/webhosting 
From daileyservices at qwest.net  Wed Aug 29 17:37:51 2007
From: daileyservices at qwest.net (Thomas C. Dailey - Dailey Services, LLC)
Date: Wed Aug 29 17:39:21 2007
Subject: [HBR] Fw: HBR-16 + RME 45...
References: <499476.36447.qm@web63302.mail.re1.yahoo.com>
Message-ID: <001201c7ea84$da1db0b0$6702a8c0@tomb2bf38c9b6e>

Many being built, as we speak.  For a meter, go look for some of the early 
70's VU meters... they're the same movement and internal resistance (50mv 
full-scale), and you get to home-brew your own scale that way.... or be 
really cool, and mount an ordinary meter UPSIDE DOWN.

Keep us aprised on your progress.

Tom - W?EAJ 

From windy10605 at juno.com  Wed Aug 29 17:51:30 2007
From: windy10605 at juno.com (Kees & Sandy)
Date: Wed Aug 29 17:54:06 2007
Subject: [HBR] Fw: HBR-16 + RME 45...
Message-ID: <20070829.165130.15551.0@webmail03.dca.untd.com>

Hi Vern,
Welcome to the list. A great substitute for the IF transformer (used by several peopel) is the 85Khz IF from a BC-453. There are still several beat up units which show up at swapfests for $15 or less and there still 3 very useable IFs in these.
73 Kees K5BCQ  

-- Vern VanZ <n7gtb@yahoo.com> wrote:
From: Vern VanZ <n7gtb@yahoo.com>

To: hbr@mailman.qth.net

Sent: Wednesday, August 29, 2007 2:04:21 PM

Subject: HBR-16 + RME 45...



Greetings.  



I just joined and wanted to say "hello out there!", and ask:  "Is anyone still building an HBR receiver?"  I've recently begun collecting parts for a variation of the HBR using a case, front panel and tuning dial from an RME 45 and various parts from other 'junked' commercial receivers (i.e.,  Hammarlund HQ-100, Knight R-55, RME 45, etc...).  I think I have most of the needed parts (power supply, main tuning, sockets, etc.), but wondering about (current) sources others may have and still use...(?)  Particularly where the I.F. transformers are concerned...  I've built CW transmitters (both tube and transistor), direct conversion receivers, regens, and just about every other piece of gear in my shack.  Thought it was time to tackle a superhet...  I  had in mind to make it general coverage, but that may be expecting a bit much at this juncture...(?)  I've also been toying with using crystal filters in the I.F....(~10Mhz), but that's still up in the air
 so-to-speak.



p.s.  - I could also use a meter movement for use as an 'S' meter, something that will fit the RME 45...  (i.e. - Square faced, 2 1/8" diameter, four mounting studs).  Anyone have one of those?



Thanks,

-Vern, N7GTB




       
____________________________________________________________________________________
Building a website is a piece of cake. Yahoo! Small Business gives you all the tools to get online.
http://smallbusiness.yahoo.com/webhosting 
************************************
Visit the HBR Receiver Web Site with over 100 pictures of receivers and 
construction notes...... via http://www.qsl.net/k5bcq/ 
there is also a mirror (faster response)at http://k5bcq.edebris.com/
 

Retrieve reflector archived data via http://mailman.qth.net/mailman/listinfo/hbr
From n7gtb at yahoo.com  Wed Aug 29 18:43:20 2007
From: n7gtb at yahoo.com (Vern VanZ)
Date: Wed Aug 29 18:44:36 2007
Subject: [HBR] Fw: HBR-16 + RME 45...
Message-ID: <488366.33099.qm@web63305.mail.re1.yahoo.com>

Tom,

Thanks for the tip on the meter.  I've been scouting ebay and found a couple that may have potential.  As for progress, I'm just about to start.  Will probably layout the holes on the chassis for mounting the power supply components.  Because I'm working with a shell (and 'look-feel') of an RME 45, the positions of some things (like the main tuning cap) are already determined.  So I need to sort out where all the other things will fall...  The original RME 45 had the power supply on the opposite end of the chassis from the HBR 16, but that should really be a trivial thing.  Still needs further investigation though.  Because the tubes are minis rather than loctals, there hopefully will be more realestate available to play with (the chassis is similar dimension of that used in the original HBR-14).

-Vern

----- Original Message ----
From: "Thomas C. Dailey - Dailey Services, LLC" <daileyservices@qwest.net>
To: HBR Receiver List <hbr@mailman.qth.net>
Sent: Wednesday, August 29, 2007 2:37:51 PM
Subject: Re: [HBR] Fw: HBR-16 + RME 45...

Many being built, as we speak.  For a meter, go look for some of the early 
70's VU meters... they're the same movement and internal resistance (50mv 
full-scale), and you get to home-brew your own scale that way.... or be 
really cool, and mount an ordinary meter UPSIDE DOWN.

Keep us aprised on your progress.

Tom - W?EAJ 

************************************
Visit the HBR Receiver Web Site with over 100 pictures of receivers and 
construction notes...... via http://www.qsl.net/k5bcq/ 
there is also a mirror (faster response)at http://k5bcq.edebris.com/
 

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






       
____________________________________________________________________________________
Pinpoint customers who are looking for what you sell. 
http://searchmarketing.yahoo.com/
From n7gtb at yahoo.com  Wed Aug 29 18:54:10 2007
From: n7gtb at yahoo.com (Vern VanZ)
Date: Wed Aug 29 18:55:13 2007
Subject: [HBR] Fw: HBR-16 + RME 45...
Message-ID: <116151.66890.qm@web63302.mail.re1.yahoo.com>

Hi Kees,

Thanks for the welcome and the tip on IF cans.  I may be able to hit the hamfest in Spokane the end of next month, otherwise I'm afraid that ebay is my only other option (unless someone here on the list has some they're willing to sell?).   I have a few (455khz I think) from the same 'junked' RME 45 as the case, etc., but don't have a good way to check them as yet...  I've hear or read that some folks use a GDO to check them out, but I haven't looked into that in detail yet.  Should be fairly simple I'd think...(?).

-Vern

----- Original Message ----
From: Kees & Sandy <windy10605@juno.com>
To: hbr@mailman.qth.net
Sent: Wednesday, August 29, 2007 2:51:30 PM
Subject: Re: [HBR] Fw: HBR-16 + RME 45...

Hi Vern,
Welcome to the list. A great substitute for the IF transformer (used by several peopel) is the 85Khz IF from a BC-453. There are still several beat up units which show up at swapfests for $15 or less and there still 3 very useable IFs in these.
73 Kees K5BCQ  

-- Vern VanZ <n7gtb@yahoo.com> wrote:
From: Vern VanZ <n7gtb@yahoo.com>

To: hbr@mailman.qth.net

Sent: Wednesday, August 29, 2007 2:04:21 PM

Subject: HBR-16 + RME 45...



Greetings.  



I just joined and wanted to say "hello out there!", and ask:  "Is anyone still building an HBR receiver?"  I've recently begun collecting parts for a variation of the HBR using a case, front panel and tuning dial from an RME 45 and various parts from other 'junked' commercial receivers (i.e.,  Hammarlund HQ-100, Knight R-55, RME 45, etc...).  I think I have most of the needed parts (power supply, main tuning, sockets, etc.), but wondering about (current) sources others may have and still use...(?)  Particularly where the I.F. transformers are concerned...  I've built CW transmitters (both tube and transistor), direct conversion receivers, regens, and just about every other piece of gear in my shack.  Thought it was time to tackle a superhet...  I  had in mind to make it general coverage, but that may be expecting a bit much at this juncture...(?)  I've also been toying with using crystal filters in the I.F....(~10Mhz), but that's still up in the air
 so-to-speak.



p.s.  - I could also use a meter movement for use as an 'S' meter, something that will fit the RME 45...  (i.e. - Square faced, 2 1/8" diameter, four mounting studs).  Anyone have one of those?



Thanks,

-Vern, N7GTB




       
____________________________________________________________________________________
Building a website is a piece of cake. Yahoo! Small Business gives you all the tools to get online.
http://smallbusiness.yahoo.com/webhosting 
************************************
Visit the HBR Receiver Web Site with over 100 pictures of receivers and 
construction notes...... via http://www.qsl.net/k5bcq/ 
there is also a mirror (faster response)at http://k5bcq.edebris.com/
 

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/
there is also a mirror (faster response)at http://k5bcq.edebris.com/


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






       
____________________________________________________________________________________
Pinpoint customers who are looking for what you sell. 
http://searchmarketing.yahoo.com/
From kbgluxford at fastmail.fm  Wed Aug 29 21:28:47 2007
From: kbgluxford at fastmail.fm (KBG Luxford)
Date: Wed Aug 29 21:29:47 2007
Subject: [HBR] Fw: HBR-16 + RME 45...
In-Reply-To: <20070829.165130.15551.0@webmail03.dca.untd.com>
References: <20070829.165130.15551.0@webmail03.dca.untd.com>
Message-ID: <46D61D4F.4060901@fastmail.fm>

Would a "good enough" substitute for an IF transformer consist of a 
couple of commercially manufactured inductances or chokes of the "right" 
inductance value, each in parallel with capacitance to provide resonance 
at the intermediate frequency and joined at the top by a small amount of 
capacitance?  In other words a pi network with each leg a resonant 
parallel combination of L and C and the top a coupling capacitor?  Do we 
really need mutual inductance between the anode of one stage and the 
grid of the succeeding stage?

73
Kevin
VK3DAP / ZL2DAP
From windy10605 at juno.com  Wed Aug 29 22:41:34 2007
From: windy10605 at juno.com (Kees & Sandy)
Date: Wed Aug 29 22:43:41 2007
Subject: [HBR] Fw: HBR-16 + RME 45...
Message-ID: <20070829.214134.16388.0@webmail03.dca.untd.com>

Sure, you can substitute for the transformer coupling but the BC-453 transformers are relatively easy to find (maybe not in VK/ZL) and if not, you can make them from 455Khz transformers. I put a writeup on the website in the "Hints and Kinks" section on how to make your own 100Khz transformers that way. Works fine and they have good "Q". But that's the beauty about "homebrew"   ....you can build what you want to build and try something new.
73 Kees K5BCQ.

-- KBG Luxford <kbgluxford@fastmail.fm> wrote:
Would a "good enough" substitute for an IF transformer consist of a 
couple of commercially manufactured inductances or chokes of the "right" 
inductance value, each in parallel with capacitance to provide resonance 
at the intermediate frequency and joined at the top by a small amount of 
capacitance?  In other words a pi network with each leg a resonant 
parallel combination of L and C and the top a coupling capacitor?  Do we 
really need mutual inductance between the anode of one stage and the 
grid of the succeeding stage?

73
Kevin
VK3DAP / ZL2DAP
************************************
Visit the HBR Receiver Web Site with over 100 pictures of receivers and 
construction notes...... via http://www.qsl.net/k5bcq/ 
there is also a mirror (faster response)at http://k5bcq.edebris.com/
 

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

From draynes at kc.rr.com  Thu Aug 30 10:56:28 2007
From: draynes at kc.rr.com (David Raynes)
Date: Thu Aug 30 10:58:12 2007
Subject: [HBR] Fw: HBR-16 + RME 45...
In-Reply-To: <46D61D4F.4060901@fastmail.fm>
References: <20070829.165130.15551.0@webmail03.dca.untd.com>
	<46D61D4F.4060901@fastmail.fm>
Message-ID: <46D6DA9C.9040608@kc.rr.com>

KBG Luxford wrote:
> Would a "good enough" substitute for an IF transformer consist of a
> couple of commercially manufactured inductances or chokes of the
> "right" inductance value, each in parallel with capacitance to provide
> resonance at the intermediate frequency and joined at the top by a
> small amount of capacitance?  In other words a pi network with each
> leg a resonant parallel combination of L and C and the top a coupling
> capacitor?  Do we really need mutual inductance between the anode of
> one stage and the grid of the succeeding stage?
>
> 73
> Kevin
> VK3DAP / ZL2DAP
> ************************************
> Visit the HBR Receiver Web Site with over 100 pictures of receivers
> and construction notes...... via http://www.qsl.net/k5bcq/ there is
> also a mirror (faster response)at http://k5bcq.edebris.com/
>
>
> Retrieve reflector archived data via
> http://mailman.qth.net/mailman/listinfo/hbr
>
Here's a link to homebrew i.f. cans:

http://www.angelfire.com/electronic/funwithtubes/IF_Can-1.html

Haven't tried this myself, but it looks very interesting!

draynes

From kbgluxford at fastmail.fm  Thu Aug 30 21:57:54 2007
From: kbgluxford at fastmail.fm (KBG Luxford)
Date: Thu Aug 30 21:59:05 2007
Subject: [HBR] Fw: HBR-16 + RME 45...
In-Reply-To: <46D6DA9C.9040608@kc.rr.com>
References: <20070829.165130.15551.0@webmail03.dca.untd.com>	<46D61D4F.4060901@fastmail.fm>
	<46D6DA9C.9040608@kc.rr.com>
Message-ID: <46D775A2.5010103@fastmail.fm>

David,

Thanks for the info on home brew IF transformers.  As the guy in Rohan 
and Martin's "Laugh-in" used to say, "vverrry interresting".

73
Kevin
VK3DAP / ZL2DAP

From wrcromwell at gmail.com  Fri Aug 31 09:24:39 2007
From: wrcromwell at gmail.com (Bill Cromwell)
Date: Fri Aug 31 09:25:55 2007
Subject: [HBR] Re: FW: HBR-16 + RME 45
Message-ID: <234313270708310624o5b024d94p75d9b7507240b6ec@mail.gmail.com>

> From: David Raynes <draynes@kc.rr.com>

> Here's a link to homebrew i.f. cans:
>
> http://www.angelfire.com/electronic/funwithtubes/IF_Can-1.html
>
> Haven't tried this myself, but it looks very interesting!
>
> draynes

Hi,

Don't forget to follow the link on that page.

Here is another:

http://web.telia.com/~u85920178/blocks/if-txfmr_tube_00.htm

Some helpful ideas on all those pages.

73,

Bill KU8H
