[TenTec] Corsair II AGC
Dr. Gerald N. Johnson
geraldj at storm.weather.net
Fri Dec 8 16:46:13 EST 2006
On Fri, 2006-12-08 at 15:19 -0600, Paul DeWitte K9OT wrote:
> Last weekend I used my Corsair II in the 160m contest. It is much quieter on
> rcv than my Omni VI+, and will hear anything that the Omni VI+ will.
> I did have some front end overload or AGC pumping from strong signals in the
> passband (not sure which). Because of the design of the AGC circuit, is
> there any cure for this?
> A narrow roofing filter like Inrad made for the Omni V& VI series would be
> nice, but would it still have the AGC problem?
I'm pretty sure the AGC in the Corsair II is derived from audio after
the detector, and so after all the crystal filters but before the audio
filter. So that has to be where the AGC pumping came from. A narrower
first IF filter would help but its only SSB bandwidth now, though the 9
Tentec or Inrad MHz CW filter will fit there. There is no roofing filter
as such in the Corsair, the main filter is right after the first mixer,
with auxiliary filters in the 2nd IF at 6.3 MHz just for narrowing with
the IF shift.
> Also has anyone tried moving the rx trx switch on the back to a place that
> is more accessible?
> Thanks for any comments either on or off the reflector.
> 73 Paul K9OT
73, Jerry, K0CQ,
All content copyright Dr. Gerald N. Johnson, electrical engineer
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