[Hammarlund] HQ-110 stability

[Singley, Rodger]

Ken,

The HQ-110 is a decent dual conversion receiver and its only real
deficit is the selectivity is somewhat lacking.  But the RF performance
should be as good as the closely related HQ-170 and the stability is not
that bad on my HQ-110.  Unlike the low cost HQ-100, it has the potential
to be a good receiver.

I would suggest monitoring the HFO and BFO on external receivers and see
which one is responsible for the shift and this will help you narrow it
down.  I am assuming the problem is occurring on all bands and not just
40 and up, if just on 40 and up then the 2'nd conversion oscillator
becomes a prime suspect.  Once you narrow it down to a stage it should
be easier to solve.

Rodger WQ9E

> -----Original Message-----
> From: hammarlund-bounces at mailman.qth.net [mailto:hammarlund-
> bounces at mailman.qth.net] On Behalf Of Kenneth G. Gordon
> Sent: Sunday, February 07, 2010 9:32 PM
> To: Hammarlund at mailman.qth.net
> 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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