[Heath] Fw: HW100 loss of signal

[Dick KF4NS]

Opening the champagne bottle here and wish I could share it with all the GREAT helpers on the Heathkit 
groups. It works like a brand new radio in all modes and bands. You guys are amazing. I have been working 
on classic radios, etc. for over 55 years and still get twisted like a pretzel trying to repair some 
troubles.

First thing I did was check for proper alignment of the HET OSC coils. Before I could even get done with 
that, I noticed some intermittent crackling and started touching everything under the coil cover. It took 
me about an hour but I finally found the nasty culprit.

So many of you were right on the money when you said it has to be the in the HET OSC area. The problem 
was found to be the little 3/4 in. wire from the HET OSC ground plane to the chassis which was a weak 
solder connection. As soon as I resoldered it everything was good as new. Amazing how something as 
insignificant as that can cause so much grief.

I cannot thank you guys enough for nailing it down to the HET OSC area. I had imagined so many 
possibilities. THANK YOU, THANK YOU !!

No matter how much experience, how much knowledge, how much confidence we have, a second or more eyes or 
minds is sometimes needed.

73, Dick KF4NS
St Petersburg, FL 33714 USA
Keep The Glow!


----- Original Message ----- 
From: "Paul Reissmann" <wd8mwt at comcast.net>
To: "'Dick KF4NS'" <kf4nsradio at verizon.net>
Sent: Friday, September 14, 2012 7:22 PM
Subject: RE: [Heath] HW100 loss of signal


| Dick,
|   I remember back when I repaired 101s, we had to solder the het osc and
| driver boards (and others in the string) ground foils to the board below
| because they were losing the needed ground contact. Similar are in the 100 if
| I recall correctly.  The later HW-101 construction manuals address this.
|  Hope this helps.
|
| Paul WD8MWT
| -----Original Message-----
| From: heath-bounces at puck.nether.net [mailto:heath-bounces at puck.nether.net] On
| Behalf Of Dick KF4NS
| Sent: Friday, September 14, 2012 3:45 PM
| To: heathkit at mailman.qth.net; Heath puck list
| Subject: [Heath] HW100 loss of signal
|
| Just when I thought I  had all the problems solved and put the rig back in
| service, this ruins my day.
|
| I had the rig on 20M with great signals coming in, all is well for about an
| hour and suddenly the S-meter
| drops to zero and audio goes dead. I just touched the band switch which had
| been completely gone over
| during maintenance, and full service was again back. All contacts were working
| fine and tested for
| continuity. All bands were performing fine. I let it go and a while later it
| did it again. This time I
| switched from USB to LSB and it perked right up and both sidebands were fine.
| I decided to try 40M and
| 15M. They never failed. Went back to 20M and guess what? It did it again !!
|
| Some things are pretty self apparent and a bit of digging can get things going
| again. I just cannot
| rationalize this MODE switch BAND switch thing only on 20M. Scanning over the
| schematic I could not begin
| to make the connection.  What seems so very odd is the loss of RF input shown
| on the S-meter and total
| loss of audio at the same time.
|
| Scratch your heads, rattle your brains and throw some darts at the schematic
| and please let me know what
| makes the bell ring.
|
| Thanks VM and 73, Dick KF4NS
| St Petersburg, FL 33714 USA
| Keep The Glow!
|
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