[Hammarlund] HQ-110 stability

[Kenneth G. Gordon]

On 8 Feb 2010 at 12:49, Greg Mijal wrote:

> The HQ 110 is reasonably stable for what it is.

Well, that is what I had thought too.

> I consider it the best bang for the buck for the round shouldered
> Hammarlunds.  They will drift over time but sudden changes in
> frequency is suspicious.  Suggest you do a quck check of the
> oscillator voltage line, then do a complete cleaning of the tuning
> capacitor bearings and shaft wipers, including the bfo.  Also, you can
> re-seat all the tubes and de-ox the sockets.  This problem sounds like
> a mechanical situation, not an electrical.

Hmmm....I suppose that could be, all right. I have never seen such 
serious frequency jumping in any receiver I have ever had which had 
a voltage regulated HF oscillator. Even the slightest change in line 
voltage causes the frequency tuned to to jump, even on 160 meters.

>  FYI: a nice HQ 110 sold at
> my Radio Club's Saturday auction and I'm happy to report the 110 is
> holding it's value.  If I had my choice of a HQ 100 or a HQ 110 I
> would go with the 110.  Reason being is that there is no bfo circuit
> in the 100!  You have to push the Q multiplier into oscillation to
> receive CW.

That never worked for me.  Even my crappy S-41G had a real BFO.

Yes. I think the 110 is a far better receiver, unless one wishes to 
SWL.

Ken W7EKB