[Swan] Re: Cygnet Audio

[Mark Shaum]

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.

73! - Mark K9TR

----- Original Message -----
Sent: Wednesday, August 04, 2004 3:01 AM
> From: K5XS at aol.com
>
> I have a Cygnet 300, and am getting reports that my transmit audio is
> restricted.
>
> I know it's not the microphone (Shure 444--works great on other rigs),
and I
> have replaced the mic audio tube with no effect.
>
> Does anyone have a good starting point for troubleshooting?
>
> Thanks.
>
> Bernie K5XS
> Arkansas
>