[Swan] Re: Cygnet Audio

K5XS at aol.com K5XS at aol.com
Mon Aug 9 11:16:23 EDT 2004


Mark,
Thanks very much.  Your assesment is pretty close to several others'.  I have 
dug out the manual, and found the carrier oscilator adjustment.  I'll hook up 
the audio generator and give that a shot.
Thank you for taking the time to respond.  I think the "boat anchor" 
community is a great bastion of commradery.
Bernie K5XS

In a message dated 8/9/2004 10:11:29 AM Central Standard Time, 
k9tr at dtnspeed.net writes:
Might want to check the alignment of the carrier oscillator against the
filter slope.  I don't have a Cygnet so can't give any specific
procedures.  Usually a trimmer capacitor is adjusted to place the
(mostly suppressed) carrier at some point down on one side of the filter
slope.  If the carrier oscillator has drifted, the resulting audio is
likely to sound too "bassy" or too "tinny" depending on which direction
the oscillator (or crystal filter bandpass) has shifted.  The overall
width of the bandpass is still determined by the sideband filter and is
not adjustable.

Other than the above, you can check the capacitors for leakage and
resistance values for drift in the mic preamp and balanced modulator in
the event it is the AF stages that is restricting the resulting
transmitted audio and not the filter/carrier frequency relationship, but
I've not seen these stages affected much by age in any of my vintage SSB
or AM gear.


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