From: "Gerry" 
Subject: RE: [drakelist] Sidetone quality/pitch






 





Wouldn't it have been =
better to
implement sidetone in this way anyway, with a major reduction in RF gain
"switched" in the the RX front end by the TX relay when in =
TX, 
together with preset AF gain to set audio level? A few extra components =
in the
RX, granted.





 





2: In the above situation I =
operate
with sidetone (anti-vox) turned to zero to mute the sidetone. If I do =
use
sidetone (RX muted of course) I find that the sidetone does not sound =
very pure
(a bit "raspy" or rough sounding). Is this normal or should =
the
sidetone sound like pure sinewave output? Also, is there any way of =
altering
the sidetone frequency? I find it a little too high pitched for my =
taste. This
is the advantage of method 1 where you can choose your own =
"sidetone"
frequency by adjusting the incoming signal to taste on the RX, then
"netting" TX VFO to same frequency in Spot =
mode.





 





Regarding SSB netting =
(spotting):





 





Can anyone explain the =
source of the
canary "warbling" sound when netting the TX and RX ? Is it the =
sound
of the two carrier oscillators beating? If so, why is this not audible =
as a
pure sinewave beat frequency, with a smooth reduction to zerobeat as the =
two
frequencies coincide, instead of the somewhat "unstable" =
sounding
canary sound? 





 





Apologies for the many =
questions in
one posting!





 





73





David





(G4GTP)









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