[Heathkit] [Heathkit:Yahoo] thanks for the help on bias problem

[G3OOU at aol.com]

Hi Dale
 
I would be inclined to check what frequency the carrier oscillator is  
generating and the passband shape and frequency of the SSB filter. These  rigs 
did not have any mechanism for adjusting the carrier oscillator and it is  
possible that one or both crystals and/or the filter have aged sufficiently to 
 have moved significantly off their correct frequencies.
 
Both carrier frequencies should be about 300Hz down each side of the filter 
 which typically equates to about -15 to -20dB into the stop band.
 
I have had one or two SSB filters that have developed faults making them  
sound very odd due to excessive ripple in the passband and so far I have been 
 able to carefully open them up and effect a repair. Normally the ripple 
should  be less than 2dB. You can see if the ripple is present by tuning 
through a  single carrier around the S3 to S5 level and watching the S meter.
 
73

Bob

Bob F Burns
C Eng,  FIET, MSE
Amateur Radio Callsign: G3OOU
Registered RSGB  Instructor
G-QRP Member No: 6907; Zone: 14, QRA: IO91WH; WAB:  TQ25
Secretary of Crystal Palace Radio & Electronics Club: _www.g3oou.co.uk_ 
(http://www.g3oou.co.uk/) 
Technical web site: _www.qsl.net/g3oou_ (http://www.qsl.net/g3oou)