[Boatanchors] General question...frequency shift with RF gain

[John Saxon]

Yes, I am seeing a voltage change on the HFO with RF gain adjustments.
--JohnK5ENQ
 

      From: Dale Parfitt <parinc1 at frontier.com>
 To: 'John Saxon' <johnbsaxon at yahoo.com> 
Cc: Boatanchors at mailman.qth.net
 Sent: Friday, January 15, 2016 10:15 AM
 Subject: RE: [Boatanchors] General question...frequency shift with RF gain
   
While I have never experienced this I would wonder if changing the RF Gain changes the current drawn by the front end stages that are controlled by the AGC line. This may change the loading on the  receiver's HV supply.
That little change may then cause a change in the RX VFO voltage, thus causing a small frequency shift. Easy enough to check with a good voltmeter.

Dale W4OP

-----Original Message-----
From: Boatanchors [mailto:boatanchors-bounces at mailman.qth.net] On Behalf Of John Saxon via Boatanchors
Sent: Friday, January 15, 2016 10:55 AM
To: Boatanchors Mail List
Subject: [Boatanchors] General question...frequency shift with RF gain

On the Hallicrafters list a fellow reported a receiver that shifted frequency with RF gain adjustments.  Several folks responded that they had had a similar experience. I am having the same issue with a National NC-101X.  Just out of curiosity:  Is a frequency shift with RF gain adjustment common?  uncommon?  in-between?
Just wondering...
--JohnK5ENQ
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