Thanks for the audio note distortion description. I'll listen for it
and see if I can hear it. Must be the sync is drifting off center
carrier due to the tone created by the musical note looking like
another carrier to lock too during a selective fade. The difference
between the radios audio response could then be due to the PLL lock
time where the Drake drifts faster then the 7030 causing the change in
tone.


In article .com,
"Joe Analssandrini" wrote:

Dear "Telamon,"

I hear this "note-flattening" on music fairly frequently when listening
to music via a station whose signal is variable in strength (when
listening on my Satellit 800 with AGC set to "slow," sync circuit
"on,." using 6.0 kHz [nominal] filter or the 4.0 kHz one, and the
station's frequency set to "spot-on"). Obviously, I cannot tell others
when they will hear this effect but it is very noticeable here on the
east coast when the VOR (whose signal varies in strength) is playing
their interval signal. Try listening to that. On the Satellit 800 (and
the two Drake radios I heard - R8B and SW8), a sustained note will
appear to change frequency, "flattening" momentarilyand then returning
to its proper frequency. This happens often.

It never happens with my AOR AR7030 Plus receiver.

Best,

Joe

"Telamon" wrote:

I don't have perfect pitch so I guess I have not heard the effect you
noted. I'm trying to understand your example so I can hear it. Are you
saying that on the voice of Russia Interval signal itself one of the
notes is flat and only the one note? If that is the case is that a high
or low note? I'll have to listen to both radios to see if I can hear
the
difference. Even though I don't have the perfect pitch ability I should
be able to hear this as a difference between the radios but if you have
more information maybe I can't hear the effect.

Both radios have selectable filters and passband tuning that shape the
sound. Usually I don't hear any tonal effects due to the sync but I can
easily hear tonal differences due to:
1. Tuning the VCO from right on to slightly off frequency.
2. Filter selection.
3. Passband tuning.
4. Audio tone controls.
5. Notch filter.

Generally how the audio sounds is mostly affected by the filter and
passband tuning, which I fiddle with to get the best high frequency
response depending on conditions. I guess I would be surprised that a
change in the audio would result from using the sync on the Drake and
that something else is causing it like the filter response not being
flat on the Drake or the way the operator controls are adjusted.

Maybe something I can listen to that is more repetitive like the tones
on WWV. Do you hear a difference there?

--
Telamon
Ventura, California