[Heath] HW100 loss of signal

[gary skillicorn]

You likely covered this already Dick but one thing you said caught my attention and that was the bandswitch itself. You said you had "gone over during maintenance". You said just touching the band switch brought it back. All it would take is a little oxidation on some of the switch contacts to cause crazy things similar to what you mentioned. I'd exercise that band switch and mode switch numerous times while spraying it with contact cleaner.  Just a thought. Gary  K3GS
 > From: kf4nsradio at verizon.net
> To: heathkit at mailman.qth.net; heath at puck.nether.net
> Date: Fri, 14 Sep 2012 15:45:18 -0400
> 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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