[Hammarlund] HQ-110 stability

[Glen Zook]

There was an optional "real" BFO for the HQ-100.  However, the vast majority of those receivers never had this accessory installed.

Glen, K9STH

Website:  http://k9sth.com


--- On Mon, 2/8/10, Greg Mijal <bluebirdtele at embarqmail.com> wrote:

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