From hbr@mailman.qth.net  Sun Feb  1 00:26:25 2004
From: hbr@mailman.qth.net (hbr@mailman.qth.net)
Date: Sat, 31 Jan 2004 19:26:25 EST
Subject: [HBR] HBR-??
Message-ID: <19b.20079c8a.2d4da1b1@aol.com>

In a message dated 1/31/04 6:46:57 PM Eastern Standard Time, 
Bill@LizCurtisHiggs.com writes:


> the plate design was far from linear; much closer to straight-line 
> wavelength than straight line frequency. Although I can use it to cover my range of 
> 5050-5750 in a High-C circuit, the linearity goes in the sewer.
> 
> Solutions:
> 
> 1. Live with it.
> 2. See if any of the folks on the list have a BC-454 or BC-455 tuning cap 
> they'd be willing to swap or sell (Anybody building up a Q-Fiver??)
> 

3. Put a fixed cap in series with the SLW variable to linearize the range
4. Tap the variable down on the coil for the same purpose.

Yes, you lose the use of the trimmers, but their range is fairly limited 
anyway.

Another trick I used in the Southgate Type 6 transceiver (20+ years ago!) was 

to use the classic ECO circuit (Hartley with a 6AU6A, screen grounded for RF, 
suppressor grounded directly), and put the grid circuit at half frequency, 
while the plate circuit consisted of a double-tuned bandpass circuit (pair of 
slugtuned coils).
Result was complete absence of pulling or chirp, very good stability and very 
linear dial from an SLW cap 

73 de Jim, N2EY




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From hbr@mailman.qth.net  Sun Feb  1 14:47:19 2004
From: hbr@mailman.qth.net (hbr@mailman.qth.net)
Date: Sun, 1 Feb 2004 09:47:19 EST
Subject: [HBR] Re: Linear Capacitor Tuning
Message-ID: <10d.2f5c03ca.2d4e6b77@aol.com>

I got involved in this about 30 years ago.  I must admit that I never put the 
following into a practical project, but here is the theoretical shape of the 
plates of a linear-with-frequency tuning capacitor:

R=SQR((-4*K)/(H*(K*A+F2)^3)+C^2)

Where:
R == Radius of plates as a function of rotation (inches)
A == Angle of rotation (radians) -- the variable in the equation
K == Rate of frequency change with rotation -- (Hz/rad)
F2 == Higher frequency (freq with plates unmeshed) (Hz)
C == Radius of cutout in stator to clear shaft (inches)
H == Ck/(F1^2*C1)
       Where: Ck == Farads per square inch of capacitor used -- this accounts 
for the plate spacing and number of plates
                F1 == Lower frequency (Hz)
                C1 == Capacitance at F1 (Farads)

The equations look much simpler when you put them in standard math notation.

Since this is only theoretical, fringing of the electric field is neglected, 
but this should have only a minor effect.

Now, does someone know how to build a capacitor once you design it?

Anyway, it is fun to see what the capacitor you want looks like.  Remember I 
did this back before home computers.  I had a TI SR-10 calculator which was 
great because you could do square roots on it!

Dan K9WEK


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From hbr@mailman.qth.net  Sun Feb  1 20:06:30 2004
From: hbr@mailman.qth.net (Ken Evans)
Date: Sun, 1 Feb 2004 15:06:30 -0500
Subject: [HBR] Eddystone 898
Message-ID: <005501c3e8fe$e1abb650$6501a8c0@pawpaw>

Anyone looking for the Eddystone 898, here is one on e-bay.

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3075380963&category=4671&sspagename=STRK%3AMEBWA%3AIT&rd=1

Ken
W4DU
Vice President - QRP ARCI
QRPARCI #696, GQRP#5918, FP#295, ARRL - Life



From hbr@mailman.qth.net  Mon Feb  2 21:44:23 2004
From: hbr@mailman.qth.net (hbr@mailman.qth.net)
Date: Mon, 2 Feb 2004 16:44:23 EST
Subject: [HBR] Re: Linear Capacitor Tuning
Message-ID: <1d6.197ca7e3.2d501eb7@aol.com>

I thought the listing I posted the other day may be of interest to some of 
the HBR group, but I haven't heard anything out of anyone.

This was one of those projects which I put quite a lot of effort into back 
when my calculus skills were quite a bit sharper than they are now.  I'm pretty 
sure the equation is valid, though.  For example, I did the shape of a linear 
tuning capacitor for the AM broadcast band and got a pretty neat looking 
shape.  For just the 80 meter band, simply offsetting the plates about 1/16th to 
1/8th inch gives nearly linear tuning with circular plates.

Let me know if you try it and/or find it interesting.  TNX, Dan K9WEK

> I got involved in this about 30 years ago.  I must admit that I never put 
> the 
> following into a practical project, but here is the theoretical shape of the 
> 
> plates of a linear-with-frequency tuning capacitor:
> 
> R=SQR((-4*K)/(H*(K*A+F2)^3)+C^2)
> 
> Where:
> R == Radius of plates as a function of rotation (inches)
> A == Angle of rotation (radians) -- the variable in the equation
> K == Rate of frequency change with rotation -- (Hz/rad)
> F2 == Higher frequency (freq with plates unmeshed) (Hz)
> C == Radius of cutout in stator to clear shaft (inches)
> H == Ck/(F1^2*C1)
>     Where: Ck == Farads per square inch of capacitor used -- this accounts 
> for the plate spacing and number of plates
>         F1 == Lower frequency (Hz)
>         C1 == Capacitance at F1 (Farads)
> 
> The equations look much simpler when you put them in standard math notation.
> 
> Since this is only theoretical, fringing of the electric field is neglected, 
> 
> but this should have only a minor effect.
> 
> Now, does someone know how to build a capacitor once you design it?
> 
> Anyway, it is fun to see what the capacitor you want looks like.  Remember I 
> 
> did this back before home computers.  I had a TI SR-10 calculator which was 
> great because you could do square roots on it!
> 
> Dan K9WEK



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From hbr@mailman.qth.net  Wed Feb  4 14:11:07 2004
From: hbr@mailman.qth.net (hbr@mailman.qth.net)
Date: Wed, 4 Feb 2004 09:11:07 -0500 (EST)
Subject: [HBR] Some photos of Homebrew HF transceiver based on Hallicrafters HT-37
Message-ID: <Pine.LNX.4.33.0402040905280.27967-100000@localhost.localdomain>

No, I did not build this. Brother found it at a rummage sale near
Avondale/Decatur GA. There was no power supply and no documentation.
It's presently running finr in RX mode using the Heath HP-23 and I've
just about got the TX section sorted out. Cabinet is not shown in photos
but is in good shape. Will be looking for a good home for this pretty
soon.

http://edebris.com/catalog2/item/1198

the thumbnails link to more detail.
original has the best resolution
may be a bit slow this AM as friend ed is rearranging the database
and making some changes to the scaling options.

-Bob



From hbr@mailman.qth.net  Fri Feb  6 18:36:03 2004
From: hbr@mailman.qth.net (hbr@mailman.qth.net)
Date: Fri, 6 Feb 2004 13:36:03 -0500 (EST)
Subject: [HBR] Looking for a few National FB coils and WTS: assorted national HRO
 stuff. HRO JR, HRO SR, HRO JR/SR(modified), RC-105, HRO-5. HRO-5A, coil sets
 ?
Message-ID: <Pine.LNX.4.33.0402061247160.18380-100000@localhost.localdomain>

Before wading through all the stuff below, I'm looking for some National
FB series coils. Have a bunch of SW series coils for swapping. Would like
to find...
oscillator and detector 'D'
RF 'E'
Curious if there is a set for higher frequencies than the 'A' set. 'AA'?

Looking for a strong offer on my National HRO 'collection'.
Really do not want to sell but do not have funds to ship to Hawaii or room
to play with it, once there. Presently located in Canton,Georgia 30114
USA

Not sure but it looks like I've got
HRO JR, HRO SR, HRO JR/SR(modified), RC-105, HRO-5. HRO-5A :-)
Plus, total of 17 coil sets.

4 COMPLETE, 2 NEED FRONT PANELS.

Can pickup or will pack all for $100 and ship at published fed ex
ground/home rates from 30114.

HRO coil sets with box #1
http://edebris.com/catalog2/item/1216

HRO coil sets with box #2
http://edebris.com/catalog2/item/1217

HRO coil set #1
http://edebris.com/catalog2/item/1206

HRO coil set #2
http://edebris.com/catalog2/item/1207

HRO coil set #3
http://edebris.com/catalog2/item/1208

HRO coil set #4
http://edebris.com/catalog2/item/1209

HRO coil set #5
http://edebris.com/catalog2/item/1210

HRO coil set #6
http://edebris.com/catalog2/item/1211

HRO coil set #7
http://edebris.com/catalog2/item/1212

HRO coil set #8
http://edebris.com/catalog2/item/1213

HRO coil set #9
http://edebris.com/catalog2/item/1214

HRO coil set #10
http://edebris.com/catalog2/item/1215

HRO receiver #1 HRO-5?
National HRO series receiver using octal tubes. HRO-5?
Tube lineup: 6sk7,6sk7,6sj7,6sj7,6sk7,6sk7,6sq7,6sj7,6v6
http://edebris.com/catalog2/item/1204

HRO receiver #2 RC-105
National RC-105 HRO receiver, coast guard
I have not seen many RC-105
Note, the 1930's Hallicrafters xtal filter!
Condition is pretty good.
Tube lineup 6d6,6d6,6c6,6c6,6d6.6d6,6b7,6c6,42
http://edebris.com/catalog2/item/1205

HRO receiver #3 HRO JR
A nice, although a bit worn, HRO JR
Tube lineup: 6d6, 6d6, 6c6, 6c6, 6d6, 6d6, 6b7, 6c6, 42
This is the only HRO jr I've ever seen, in person
http://edebris.com/catalog2/item/1218

HRO receiver #4 HRO JR, modifies or SR modified?
This is a very early HRO with some minor modifications and a lot of use
Must have been pretty nice performer to become so 'polished'.
Tube lineup is 58, 58, 57, 57, 58, 58, 2b7, 57, 2a5
That's right, a 2V set.
Note the pull type switch on the front which was common on 30's vintage
battery sets
This is in pretty nice shape considering age and that it saw a lot of use
http://edebris.com/catalog2/item/1219

HRO receiver #5 HRO SR?
Pre-war HRO needs a front panel and as with #6 needs a dial (I have one
dial)
Tube lineup is 6d6, 6D6, 6C6, 6C6, 6D6, 6D6, 6B7, 6C6, 42
Look closely, is HRO JR or SR?
Less effort required than for #5, needs only panel and usual old radio
refurb
http://edebris.com/catalog2/item/1220

HRO receiver #6  HRO-5A ?
Not sure which HRO this is.
It used 11 octal tubes which suggests it's the HRO-5A
Tube lineup would be 6k7,6k6,6j7,6j7,6k7,6k7,6h6,6j7,6v6.6j5,6h6
The lack of tube shield hardware suggests use of metal versions of these
tubes.
Note that the variable capacitor is lower value in each section than the
other HRO's I've shown here (1-5)
So, what is it, really?
It looks complete enough to warrant and deserving of a restoration job.
http://edebris.com/catalog2/item/1221

Thanks,
-bob



From hbr@mailman.qth.net  Fri Feb  6 20:23:24 2004
From: hbr@mailman.qth.net (Al Klase)
Date: Fri, 06 Feb 2004 15:23:24 -0500
Subject: [HBR] Re: [Boatanchors] Looking for a few National FB coils and WTS: assorted
 national HRO stuff. HRO JR, HRO SR, HRO JR/SR(modified), RC-105, HRO-5. HRO-5A,
 coil sets ?
In-Reply-To: <Pine.LNX.4.33.0402061247160.18380-100000@localhost.localdomain>
References: <Pine.LNX.4.33.0402061247160.18380-100000@localhost.localdomain>
Message-ID: <4023F7BC.5020703@bw.webex.net>


ah7i@atl.org wrote:
> Curious if there is a set for higher frequencies than the 'A' set. 'AA'?

There was, at least, a 19-33MHz coil set.  My complete list 
is at: 
http://www.webex.net/~skywaves/commrx/National/FB-7/FB-7.html

Al

-- 
Al Klase - N3FRQ
skywaves@webex.net
Flemington, NJ 08822
Web Page:  http://www.webex.net/~skywaves/home.htm

From hbr@mailman.qth.net  Sat Feb  7 19:49:35 2004
From: hbr@mailman.qth.net (hbr@mailman.qth.net)
Date: Sat, 7 Feb 2004 14:49:35 EST
Subject: [HBR] Old QSTs FS
Message-ID: <ba.4f384cea.2d569b4f@aol.com>

Folks, 

Some time back I mentioned having some old QSTs to get rid of.
Here's the complete list:

1957 Jun July Aug Nov

1958 Jun July Aug Sep Oct Nov Nov Dec (yes, 2 Novembers)

1959 Jan Feb Mar Apr May Jun July Aug Sep Oct Nov Dec

1960 Jan Feb Mar Apr Jun July Aug Oct Nov Dec

1961 Jan Feb Mar May Jun July Sep Oct Nov Dec

1962 Jan Feb Mar Apr May Jun July Aug Sep Oct Nov Dec

1963 Jan Feb Mar Apr May Jun July Aug Sep Oct Nov Dec

1964 Jan Feb Mar Apr May Jun July Aug Sep Oct Nov Dec

1965 Jan Feb Mar Apr May July Aug Sep Oct Nov Dec

1966 Jan Feb Mar Apr May Jun July Aug Sep Oct Nov Dec

1967 Jan Feb Mar Apr May Jun July Aug Sep Oct Nov Dec

1967 Jan Feb Mar Apr May Jun July Aug Sep Oct Nov Dec

1968 Jan Feb Mar Apr May Jun July Aug Sep Oct Nov Dec

1970 Jan Feb Mar Apr May Jun July Aug Sep Nov Dec

1971 Jan Feb Mar Apr May Jun July Aug Sep Oct Nov Dec

1972 Jan Feb Mar Jun July Aug Sep Nov Dec

1973 Jan Feb Mar Apr May Jun July Aug Sep Oct Nov Dec

Conditions range from near-mint to worn-but-readable. Make me an offer on
any or all! Shipping by media mail from 19087 is on the buyer.

73 de Jim, N2EY 


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From hbr@mailman.qth.net  Sun Feb  8 17:01:15 2004
From: hbr@mailman.qth.net (hbr@mailman.qth.net)
Date: Sun, 8 Feb 2004 12:01:15 EST
Subject: [HBR] HBR16 40 meter coil spec info needed
Message-ID: <1f1.1876637e.2d57c55b@aol.com>

I have 2 coil specs for 40 meters. About a 1 turn difference. What are the 
correct coil specs please. Thanks-Lew KlNDV

PS-Im still wrestling with the  1st osc and I wanna thank Walt for all his 
time and advice! I will get it -sooner or later-hi! 


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From hbr@mailman.qth.net  Sun Feb  8 17:49:48 2004
From: hbr@mailman.qth.net (Darrell, WA5VGO)
Date: Sun, 08 Feb 2004 11:49:48 -0600
Subject: [HBR] HBR16 40 meter coil spec info needed
In-Reply-To: <1f1.1876637e.2d57c55b@aol.com>
Message-ID: <5.2.0.9.2.20040208114439.00b18ee8@mail.earthlink.net>

Lew,

The actual coils will vary depending on your particular components and 
layout. You will have to experiment to get your tracking exact. Either coil 
you wind will most likely be a good starting place.

Regards,
Darrell






From hbr@mailman.qth.net  Mon Feb  9 01:14:44 2004
From: hbr@mailman.qth.net (George R. Griesbach)
Date: Sun, 8 Feb 2004 19:14:44 -0600
Subject: [HBR] FS-Misc items
Message-ID: <NHBBKIJJOLOIFFNNPMBJAEKLFEAA.w5grg@comforttexas.net>

I have added more items to my website, and would like to sell some (or all)
of them. I accept offers and usually will trade, but for now, I would like
to only sell outright.
Pictures and descriptions on my website. There is too much to post here.
http://www.comforttexas.net/w5grg/



Additionally , I am selling items from my fathers estate, not ham items ,
but some hams may have interest. All offers will receive consideration,
especially for multiple sales.
Pictures and descriptions here
 http://www.comforttexas.net/forsale/thumbs/index.html

Thank You
George R. Griesbach W5GRG
505 River Oaks Rd.
Comfort, Texas 78013
w5grg@comforttexas.net
http://www.comforttexas.net/w5grg
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From hbr@mailman.qth.net  Fri Feb 13 16:02:05 2004
From: hbr@mailman.qth.net (George R. Griesbach)
Date: Fri, 13 Feb 2004 10:02:05 -0600
Subject: [HBR] For Sale : Misc
Message-ID: <NHBBKIJJOLOIFFNNPMBJGEGFFFAA.w5grg@comforttexas.net>

For Sale items;

Gonset Communicator II very nice shape, clean, receives well, could not
check xmit-no mic plug. but should work ok. $85.00

Heath kit SG-6 vintage Signal generator w/manual $35.00

M.C. Jones Micro Match Model 702.27, SO-259 connectors 0-4 Watts,SWR,VSWR
meter $125.00

M.C. Jones MicroMatch Model 706, 0-400 watts,SWR,VSWR meter "N"
connectors$150.00

Lumidor GasPro Plus Model MPU-16 HandHeld Personal gas analyzer needs manual
and calibration $100.00

2 ea. Maxon Model 49-S transceivers set for channel B w. Silenta Universal
headsets w/mics. One is nice the other is rougher, it is missing its battery
cover, and belt clip. Both seem to work ok $50.00/both

Kiethly Model 261 Picoampere Source, works good, just recapped $150.00

Hickock 191 X Crystal controlled signal generator w/vtvm. Has 100kc and
1000kc crystals. $100.00

AN/USN-441 Precision Calibrator $100.00

I have lots of tubes, even some 47's, 24's 2X6's etc. Let me know what you
need
6146, 807's tested $6.00
Small tubes starting at $1.00 as they come or, $2.00 tested

RCA Receiving tube Form 1275C, 1275B , 1942, 1946 , the 1942 model has some
pages missing some content-looks like the paper got soft , the 1946 is
better $20.00 for both publications.


Thank You
George R. Griesbach W5GRG
505 River Oaks Rd.
Comfort, Texas 78013
w5grg@comforttexas.net
http://www.comforttexas.net/w5grg



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From hbr@mailman.qth.net  Wed Feb 25 18:58:08 2004
From: hbr@mailman.qth.net (hbr@mailman.qth.net)
Date: Wed, 25 Feb 2004 13:58:08 -0500 (EST)
Subject: [HBR] WTS: Old homebrew receiver, breadboard.
Message-ID: <Pine.LNX.4.33.0402251349570.9006-100000@localhost.localdomain>

It's got to be good, he used the best parts!

Browning-Drake RF parts.
National transformers and dials.
'floating' 4 pin sockets.

I think it's really pretty too, but alas, have some serious weeding to do.

Receiver is in working condition with a good set of tubes.
$175, picked up. $190 packed for shipping plus actual ship charges.
Will wrap tubes individually and form a base to protect under-board
wiring.

http://edebris.com/catalog2/item/1255

-bob



From hbr@mailman.qth.net  Thu Feb 26 13:23:14 2004
From: hbr@mailman.qth.net (hbr@mailman.qth.net)
Date: Thu, 26 Feb 2004 08:23:14 EST
Subject: [HBR] Lew Lipson inre: new e mail address
Message-ID: <126.3b614c12.2d6f4d42@aol.com>

I am changing over to netzero so please bookmark my new e mail address. I 
will hold the aol address temporarily. Thanks-Lew Lipson

new e mail will be LJL160@netzero.com


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