[Hammarlund] HQ-110 stability

[Carl]

Put a meter on the 0A2 line and see what its dynamic stability really is. 
Most Ive checked are far from stable or the series resistor has increased to 
the point of marginal performance. Is the BFO a real one or a regen IF? 
Wasnt a xtal BFO an option on the non A version as with the HQ-100?

Carl


----- Original Message ----- 
From: "Kenneth G. Gordon" <kgordon2006 at verizon.net>
To: <Hammarlund at mailman.qth.net>
Sent: Sunday, February 07, 2010 10:32 PM
Subject: [Hammarlund] HQ-110 stability


>I used my HQ-110C in the last CX and noticed very quickly
> that it was very unstable.
>
> Every time some appliance in the house turned on or off,
> the HQ-110 would change frequency very noticeably.
>
> I checked the 0B2 regulator tube, and it appears to be
> working properly. And I changed the 6C4 HF oscillator, with
> no noticeable effect.
>
> I have some Hammarlund notes from BAMA that mention
> that the 6BE6 could cause drift, but my problem sounds
> more like dynamic instability rather than simple drift.
>
> I would like to hear from others who own and use this
> receiver as to whether or not their receivers have as bad
> instablility as mine.
>
> Any ideas from anyone towards a solution cheerfully
> accepted.
>
> Ken Gordon W7EKB
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