[Heathkit] HW-101, full carrier, no voice when in SSB position & PTT activated

Thu, 29 May 2003 20:22:30 -0400

 Sounds like balanced modulator trouble, could be a
bad carrier null pot, that's a common problem.

Mark  WB8JKR

On Thu, 29 May 2003 20:11:30 EDT [email protected] writes:
> Greetings,
> 
> I am trying to restore a HW-101, the receiver works fine, the 
> transmitter 
> works fine but only on CW. When shifting to SSB and pressing the PTT 
> button, all 
> I get is full carrier out, +/- 100 watts Continuous Wave, I cannot 
> get the 
> carrier to balance out no matter what I try. The bias is set 
> correctly, but there 
> is no idling current in SSB, just full output each time I press the 
> PTT 
> switch with the mode switch in either SSB position.
> 
> Normal logic would suggest the trouble is in the balanced modulator 
> section, 
> but with these old rigs, it seems that normal logic and trouble 
> shooting 
> techniques are out the window. Has anyone else experienced this, can 
> anyone point 
> me in the right direction? I have read many of the archives, but 
> maybe I missed 
> the one referring to this phenomena.
> 
> Any help is appreciated.
> 
> 73, 
> John, K3AOT
> 
> 
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