[Heathkit] Heathkit Digest, Vol 199, Issue 1

Thu Dec 17 17:35:43 EST 2020

Hi Bruce

I have replaced fried switch contacts in wafers using 10BA brass nuts 
and bolts to hold them in place. There is an item with photo on wafer 
switch repairs/mods on my technical web site.

73

Bob

Bob F Burns G3OOU, G-QRP 6907, @BobFBurns
Crystal Palace Radio & Electronics Club: http://cprec.btck.co.uk/
Admin/sales site: http://www.g3oou.co.uk/ Technical site: www.qsl.net/g3oou

On 17/12/2020 22:09, heathkit-request at mailman.qth.net wrote:
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> Today's Topics:
>
>     1. FW: AR-3 Bandspread Dial (Gary H. Harmon, Jr.)
>     2. Parting out Heathkit (for Bell & Howell) O-Scope	10D-203-3
>        (hwhall at compuserve.com)
>     3. Heathkit Green Paint (Jim)
>     4. Heterodyne crystals (keckerle at chartermi.net)
>     5. SB200 parts (Bruce Hudler WK3A)
>     6. Problems with HW-101 (Kenneth G. Gordon)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Fri, 30 Oct 2020 19:09:14 -0500
> From: "Gary H. Harmon, Jr." <gharmon at idworld.net>
> To: <heathkit at mailman.qth.net>
> Subject: [Heathkit] FW: AR-3 Bandspread Dial
> Message-ID: <[email protected]>
> Content-Type: text/plain;	charset="us-ascii"
>
> Anyone have an extra or is anyone making them?
>
>   
>
> 73,
>
>   
>
> Gary H. Harmon, Jr. - K5JWK - HAM Radio, HEATHKIT, and ATARI Archaeologist
>
> 6003 Archwood
>
> San Antonio, TX 78239-1504
>
> (210) 657-1549 <home>
>
> (210) 884-6926 <cell and text>
>
> (210) 657-1549 <FAX with prior notification>
>
> gharmon at idworld.net
>
>   
>
> "Retirement = Every day is a Saturday except Sunday"
>
> "Real radios glow in the dark"
>
> "Too many projects, not enough time"
>
>   
>
> http://www.grissomroadcoc.org
>
>   
>
>
>
> ------------------------------
>
> Message: 2
> Date: Sat, 31 Oct 2020 02:51:24 +0000 (UTC)
> From: hwhall at compuserve.com
> To: "heathkit at mailman.qth.net" <heathkit at mailman.qth.net>
> Subject: [Heathkit] Parting out Heathkit (for Bell & Howell) O-Scope
> 	10D-203-3
> Message-ID: <37285423.810783.1604112684808 at mail.yahoo.com>
> Content-Type: text/plain; charset=UTF-8
>
> By Heathkit for Bell & Howell schools, model 10D-203-3, 5inch, 5MHz scope. Missing power transformer. All other parts available. Make offer, it's just in the way here.
>
> WayneWB4OGM
>
> ------------------------------
>
> Message: 3
> Date: Mon, 23 Nov 2020 20:17:08 -0500
> From: Jim <jim at w1jt.net>
> To: Heathkit at mailman.qth.net
> Subject: [Heathkit] Heathkit Green Paint
> Message-ID: <06d6f7c6-90d1-6a8a-c25c-c1c2b3c28009 at w1jt.net>
> Content-Type: text/plain; charset=utf-8; format=flowed
>
> Hello all,
> Wondering if anyone knows of a source for Heathkit Green Paint? I've a
> few items I'll be working on this coming Winter and I'd really like to
> be able to make them look good with a fresh coat of paint.
>
> If anyone knows a good source I'd be grateful to hear about it.
>
> Thanks!
>
> 73 Jim W1JT
>
>
> ------------------------------
>
> Message: 4
> Date: Wed, 09 Dec 2020 22:41:23 +0000
> From: keckerle at chartermi.net
> To: "'heathkit at mailman.qth.net'" <heathkit at mailman.qth.net>
> Subject: [Heathkit] Heterodyne crystals
> Message-ID: <d59c6737fc93cfac0e6595c50842c2b548ee5830 at webmail>
> Content-Type: text/plain; charset=UTF-8
>
> Looking for two heterodyne crystals, 37.395 (28.5MC) and 38.395
> (29.5MC). Both are used in the SB series radios.K8FE
>
>
> ------------------------------
>
> Message: 5
> Date: Wed, 16 Dec 2020 13:21:14 +0000 (UTC)
> From: Bruce Hudler WK3A <hudlerb54 at verizon.net>
> To: "heathkit at mailman.qth.net" <heathkit at mailman.qth.net>
> Subject: [Heathkit] SB200 parts
> Message-ID: <2069994992.1269586.1608124874925 at mail.yahoo.com>
> Content-Type: text/plain; charset=UTF-8
>
> Hello group,Working on a pretty rough one.?
> Is there a source for a replacement wafer switch - the tank circuit one? The 20m and 15m sections are vaporized.....I have seen taking good fingers out of other switches and use screws to attach them on the old wafer.?
> Bruce WK3A
>
> ------------------------------
>
> Message: 6
> Date: Thu, 17 Dec 2020 14:08:53 -0800
> From: "Kenneth G. Gordon" <kgordon2006 at frontier.com>
> To: heathkit at mailman.qth.net
> Subject: [Heathkit] Problems with HW-101
> Message-ID: <5FDBD6F5.982.164B85F at kgordon2006.frontier.com>
> Content-Type: text/plain; charset=US-ASCII
>
> Hello Gary and all:
>
> I am working on an HW-101 for a friend and have run into a problem I have
> not seen before. I am not sure how to address this, so I am asking for
> advice here.
>
> But first some history.
>
> My friend bought the HW-101, with an HP-23 and a speaker, at a garage
> sale for about $50.00. It was complete, but very dirty. He cleaned it up quite well. He later
> found and bought a Heathkit desk-microphone at another garage sale.
>
> I completely rebuilt the HP-23 and it is completely up to spec.
>
> I have cleared many problems with the HW-101.
>
> The first one was that the VFO would competely stop working after a short
> warm-up period. I fixed that by replacing the VFO's FET, and replacing the
> VFO's voltage regulator. The VFO is now stable and reliable.
>
> Then, when I attempted it align the rig, following the manual's
> directions, I found that I could not find any peak on either the grid or
> the plate coils for the driver on 10 or 15 meters, and the peaks on 40 and
> 20 were weak, probably due to the fact that all those coils are in a series-parallel
> arrangement..
>
> The coils on 80 meters appeared to peak correctly.
>
> I replaced the driver and final amp tubes with new ones.Then, when testing
> for power output, if the rig was cold, power output on 80, 40 and 20
> appeared to be close to spec, although a little low, but as the rig warmed up, power
> output would drop to zero.
>
> Replacing the IF amplifier tubes appeared to fix that drop-out problem,
> but things are still not correct.
>
> I checked the heterodyne oscillator alignment, and all of those appear
> correct. I reduced all of those to -3.5 VDC at the TP. Although the manual
> calls for lower voltages, and a maximum (apparently) at -2.0 VDC, I didn't
> think the higher voltage would hurt anything, so I left that alone, as
> long as all were equal. I also tuned them all down on the slow side of the
> peak as the manual orders.
>
> Using the calibrator, I can get a reading of well over S-9, like 20 dB
> over S-9, on 80, but only S-3 on 40, and no S-meter reading at all on 20
> and up, although I can hear the calibrator on all bands.
>
> Power output in TUNE on 80 is close to 100 watts, although in the past, on
> other HW-101s and SB transceivers I have worked on, the NORMAL power
> output on 80 has always been 110 watts. And this power output is only
> available with the MIC/CW LEVEL pot all the way up
>
> I can get about 75 watts on 40 and 20, but only 5 to 10 watts on 15 and 10
> meters.
>
> I have carefully examined all the wiring and soldering and can, so far,
> find no faults in either.
>
> What is bugging the heck out of me is that I cannot figure out WHY I
> cannot tune the driver grid and plate coils at all on 15 and 10 meters.
>
> As I run the slugs further into the coils, the signal from the calibrator gets louder, but never
> comes to a peak.
>
> Everything LOOKS correct there. All the coils appear to be the correct
> ones, but unless I can get the alignment done correctly, both power
> output, and receiver sensistivity will be way low.
>
> Has anyone run into a similar problem in the past, what did you find, and
> how did you correct it?
>
> Ken W7EKB
>
>
>
>
> ------------------------------
>
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> End of Heathkit Digest, Vol 199, Issue 1
> ****************************************