[Heathkit] HW100 loss of signal

[Bill Cromwell]

Hi Dick,

I'm voting for Don and the heterodyne oscillator for twenty meters. Eddy
might have lead there too and that heterodyne oscillator is where I
would look for the bad solder joint if that's what's happened.

On my old Kenwood R-599, after 25 years of steady use I lost RX on the
CW mode. Just.. nuthin. There was a bad solder joint on the filter board
at the CW filter exported from Japan when the radio was built. A lil
touch up solder job and it's been running ever since. Bad solder joints
do not have to show up early in life - or ever. I scrapped out a
useless, unwanted, tube based frequency counter that was over 50 years
old and still worked perfectly (such as perfect was). I found a
grounding wire in one of the divider chains that was still tightly
crimped onto the ground lug and with no solder at all. My thoughts were
"well - whadayaknow". It was still working to spec when it was
retired/scrapped.

73,

Bill  KU8H



On Fri, 2012-09-14 at 15:45 -0400, Dick KF4NS wrote:
> 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!