[Heathkit] Re: Heathkit Digest, Vol 55, Issue 20

Mon Aug 25 20:32:21 EDT 2008

If anyone is interested in an EXCELLENT (and cheap!!) digital dial, 
they need look NO further than N3ZI. I have 2 of his kits, the latest 
for 'vintage' radios with multiple IFs. How the heck can you go wrong 
for a SIMPLE kit for $29.?????!!!!!

ron

N4UE

PS: look on eHam for his reviews....

-----Original Message-----
From: heathkit-request at mailman.qth.net
To: heathkit at mailman.qth.net
Sent: Sat, 23 Aug 2008 4:01 am
Subject: Heathkit Digest, Vol 55, Issue 20

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Today's Topics:

1. SB-304 (kiyoinc at attglobal.net)
2. Re: SB-304 (Tom N?JMY - AAR7FV)
3. RE: Heathkit Digest, Vol 55, Issue 19 (Robert P. Ward)
4. WTB: schematic (Edward B Richards)
5. Re: WTB: schematic (Ron.K3PID)
6. Re: WTB: schematic (revcom at wbsnet.org)
7. Re: HP-1144 PS (Richard)
8. IM-2400 Hand held Counter FOR SALE (David Thompson)

----------------------------------------------------------------------

Message: 1
Date: Fri, 22 Aug 2008 08:56:01 -0400
From: kiyoinc at attglobal.net
Subject: [Heathkit] SB-304

To: heathkit at mailman.qth.net
Message-ID: <48AEB761.8050702 at attglobal.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

I got the SB-303 recap kit from Tom (www.hayseedhamfest.com)
yesterday. Hey thanks Tom!

These caps are the proper axials.

The big 2200 and the other XICONs have a black stripe on the side 
marked
" - - -". One end of the cap is black. Does that mean that's the
"minus" end?

The other caps, the Nichicons, have "-" arrows pointing to one end.
That's the "minus" end of the cap, correct?

I had been stalled on an SB-303 project for a while for a couple
reasons. This 303 has a low level AC hum in spite of replacing the main
capacitor.

I'm guessing one of my 500 ufd electrolytics is bad. Given that 303's
are 30+ years old, it's not a bad idea to do a total recap of the
electrolytics. I started a couple times to order a full set of caps,
quantity 100 or 250, with the idea of selling off the excess as kits.

I was overjoyed that Tom stepped up to the plate so that I would not
have to do that.

I've been much too sick to take on a project like ordering and 
rebagging
a couple thousand capacitors, advertising them, taking orders and
mailing them. I'm doing a better but still, given this economy, I'm
focussed on my day job. Don't know if anyone here has noticed but the
economy has gotten kinda weird.

Any of you with a '303 or '313, Tom
 has the caps. Get em while their
hot!!!

Back to this '303.

I've got a series of reversible upgrades planned for mine. Some of this
is experimental and might not work out but we'll see.

1) The recap using Tom's kit, get rid of the AC hum.

2) Clean the LMO and get it stable. The '303's LMO is capable of a few
cycles per hour stability. These radios are amazing.

3) Lead shot in the main tuning knob. Makes it smooth.

4) Polish the knobs and the visible plastic. Paint the cabinet to
freshen up the look.

5) Tighten the bandpass. I have a '303 with two 2.1 ssb filters in
series. Cuts down the blowby a lot. I have some ideas for doing this at
a low cost.

6) Open up the bandpass. I have a '313 with the 5 kHz AM filter. I'd
like a 10 kHz AM filter. I've heard there's an LC filter mod. That
would be better for the '313.

7) PSK31 and other digital modes on the back panel. If it's all done
in software, is the '303 stable enough? Morse code, RTTY, slowscan, 
etc.

8) Digital readout inside the 303.
http://www.qrpkits.com/freqcounter.html has a small counter. Not as
sophisticated as the AADE but the price is nice. It might fit in the
[1...2...3...4...5] window. I'd only put it inside if it were
reversible, otherwise I'd put it in a small Heath looking station
control box.

I'd call a radio with all the mods an SB-304.

de
 ah6gi/4

------------------------------

Message: 2
Date: Fri, 22 Aug 2008 08:51:46 -0500
From: Tom N?JMY - AAR7FV <tfarl at mchsi.com>
Subject: Re: [Heathkit] SB-304
To: <kiyoinc at attglobal.net>, <heathkit at mailman.qth.net>
Message-ID: <00aa01c9045e$37cc42a0$6901a8c0 at LAPTOP>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=response

Hello Cory and the list.
----- Original Message ----- >
> The big 2200 and the other XICONs have a black stripe on the side 
marked
> " - - -". One end of the cap is black. Does that mean that's the
> "minus" end?

Actually, no. On common axial electrolytic caps, the black end (which 
is an
insulating material) will be your positive lead. It's also identified 
by
the indented ring or groove near one of the ends.

The can, or body, is negative, so you will note that the negative lead 
is
attached directly to it.

> The other caps, the Nichicons, have "-" arrows pointing to one end.
> That's the "minus" end of the cap, correct?

That's affirmative, Sarge.

> I had been stalled on an SB-303 project for a while for a couple 
reasons.
> This 303 has a low level AC hum in spite of replacing the main 
capacitor.

Could also be a ground-loop, too.

> Any of you with a '303 or '313, Tom has the caps. Get em while their
> hot!!!

Thanks for the kind words, Cory. We've sold about 180 can-type caps and

kits since February, thanks to our wonderful customers and friends. 
Most
recently we've started stocking the multi-section can-cap for the 
Hammarlund
HQ-129X. We also did our first prototype Halli SX-117. On the Heathkit
front, we stock DX-60, DX-100, HR-10, HW-16, SB-301, SB-303 (no cans),
SB-310, SB-313 (no cans), and SB-401, in both complete recap kits and 
cans
only. The rest we can get on about 2 weeks notice. We also stock many
Drake units including the 2-A, 2-B, most R-4 variants, T-4, T-4X, most
TR-4's and the TR-4C.

Couldn't do it without the generous technical help of many folks from 
this
list.

I apologize for this shameless outburst of capitalism, but after all, 
Cory
tee'd it up so perfectly, hi HI!

Tnx again es vy 73,
Tom NØJMY
Hayseed Hamfest Co.
www.hayseedhamfest.com

------------------------------

Message: 3
Date: Fri, 22 Aug 2008 10:23:56 -0400
From: "Robert P. Ward" <wardbnj at comcast.net>
Subject: [Heathkit] RE: Heathkit Digest, Vol 55, Issue 19
To: <heathkit at mailman.qth.net>
Message-ID: <LBEEKLOMFLODGMHLNJCJAEALEBAA.wardbnj at comcast.net>
Content-Type: text/plain; charset="us-ascii"

To the list and Joe

Hi Joe

Don't think you will find the original parts kit to change the
power supply to an "A" model.
I recently installed a crowbar circuit in my Heath supply. I used the
schematic form ARRL Handbook, titled 28-V high current supply. The 20 A
secondary20fuse will have to be moved to "see" raw voltage and add the
crowbar,
I used a 15V zener in my design. Also added a BIG diode from the 
regulated
output to the "raw" DC input to handle back-flow. Simple but it works..

Bob NQ3N

Message: 5
Date: Thu, 21 Aug 2008 18:58:11 -0700
From: "Joe Hatvany" <joekb7svi at verizon.net>
Subject: [Heathkit] HP-1144 PS
To: <heathkit at mailman.qth.net>
Message-ID: <000d01c903fa$88bc02e0$7801a8c0 at joe>
Content-Type: text/plain; format=flowed; charset=iso-8859-1;
reply-type=original

To the list

Does any one know if I can find a source for parts to upgrade the( 
HP-1144
PS to a HP-1144A ? As it happens my HP-1144 does not have the crowbar
circuit included, on the regulator board an did some nasty things to my
SB-104A's "A" & "B" boards, and possibly rhe Output Transistors when the
un-soldered ground pin came loose from the regulator board. (poor kit
building )
Any and advice will be appreciated

Thanks &73
Joe KB7SVI

------------------------------

Message: 4
Date: Fri, 22 Aug 2008 08:00:15 -0700
From: Edward B Richards <zuu6k at juno.com>
Subject: [Heathkit] WTB: schematic
To: heathkit at mailman.qth.net
Message-ID: <20080822.080133.3860.2.zuu6k at juno.com>
Content-Type: text/plain; charset=us-ascii

Hi all;

I need a schematic for the Astron LS-35A 28volt power supply. I will pay
for copying and mailing. Thank you,

Ed K6UUZ
____________________________________________
________________
Recharge and relax. Click for great vacation ideas.
http://thirdpartyoffers.juno.com/TGL2141/fc/Ioyw6i3nMAbG8t2cKU2EWgbVB8rYcUqL8WYQibZkLYjvTK9Wb3VEwX/

------------------------------

Message: 5
Date: Fri, 22 Aug 2008 16:03:49 -0500
From: "Ron.K3PID" <ron.k3pid at sbcglobal.net>
Subject: Re: [Heathkit] WTB: schematic
To: <heathkit at mailman.qth.net>, "Edward B Richards" <zuu6k at juno.com>
Message-ID: <7990176C068E46E8BB883E81D264262F at CYCLOPS>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original

Have you tried contacting them? Email them at 
astroncorporation at yahoo.com

Ron H
--
This outgoing email was scanned by
Norton Antivirus Corp. Edition
and found to be virus free!

------------------------------

Message: 6
Date: Fri, 22 Aug 2008 17:56:19 -0500 (CDT)
From: revcom at wbsnet.org
Subject: Re: [Heathkit] WTB: schematic
To: "Ron.K3PID" <ron.k3pid at sbcglobal.net>
Cc: heathkit at mailman.qth.net
Message-ID:
<660b3db72dcc47c64e652728c6edf55a.squirrel at marconi.wbsnet.net>
Content-Type: text/plain;charset=iso-8859-1

In all my 'inifinite wisdom' and 'computer expertise' I apparently 
erased
the message requesting an Astron 24V PS schematic.

What model were you looking for? I have most Astron schematics on hand
here. Looking them over, the 24V and 12V are basically the same with 
only
a few component changes and of course higher voltage transformer and
higher ratings for the pass transistors and capacitors.

Rod
K0EQH

> Have you tried contacting=2
0them? Email them at 
astroncorporation at yahoo.com
>
> Ron H
> --
> This outgoing email was scanned by
> Norton Antivirus Corp. Edition
> and found to be virus free!
>

------------------------------

Message: 7
Date: Fri, 22 Aug 2008 18:10:11 -0500
From: "Richard" <theprof at texoma.net>
Subject: Re: [Heathkit] HP-1144 PS
To: <heathkit at mailman.qth.net>
Message-ID: <7F0B79E16F26434BB41EE289F626F9DE at thebatcave>
Content-Type: text/plain; charset="us-ascii"

Same concern but an external crowbar (zener/SCR) will do just as well. I
use them in my homebrew supplies.

On Thu, 8/21/08, Joe Hatvany <joekb7svi at verizon.net> wrote:

Does any one know if I can find a source for parts to upgrade the( 
HP-1144
PS to a HP-1144A ? As it happens my HP-1144 does not have the crowbar
circuit included, on the regulator board an did some nasty things to my
SB-104A's "A" & "B" boards, and possibly rhe Output Transistors when 
the
un-soldered ground pin came loose from the regulator board. (poor kit
building )

------------------------------

Message: 8
Date: Fri, 22 Aug 2008 21:57:55 -0400
From: "David Thompson" <thompson at mindspring.com>
Subject: [Heathkit] IM-2400 Hand held Counter FOR SALE
To: <Heathkit at mailman.qth.net>
Message-ID: <00ae01c904c3$a95bf680$c5659a04 at yourxb2x7j77gn>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original

I have the counter, case, manual, and wall wart. Used this to track the
frequency on a=2
0Meissner EX Signal Shifter. Goes to 512Mhz.

$40 plus shipping.

73 Dave K4JRB
thompson at mindspring.com

------------------------------

_______________________________________________

End of Heathkit Digest, Vol 55, Issue 20
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