[Hammarlund] HQ-170 OSCILLATOR STABILITY

[Greg Mijal]

The HQ 170 and 180 will always drift a bit due to lack of a crystal
controlled oscillator.  It gets magnified
by the demands of frequency stability in the ssb mode. 
This opinion is from observation of 1 HQ 180A and 2 HQ 170's run in my
shack.
 When the A/C kicked on in the room the receivers would re-act shortly with
a drift.
I personally give the 170 180 low marks in the SSB stability and audio
departments but find the
radio fun to use on the air and sensitivity was good for all models I had.
A little off the subject but I currently have a HQ 180A modified for the
USCG.  It's a basic 180 with a 10 position
crystal channel switch assembly added where the clock was supposed to go,
set-up for 19" rack mounting and a built-in 3 tube
noise silencer running at mid IF.   I have all the "civilian"  doc's for
the radio but no military info.  Is anyone familiar with this unusual
variation of the HQ 180?
Tnx
Greg
WA7LYO
in sunny Feenix



> [Original Message]
> From: Larry Harrison <harrisonl at comcast.net>
> To: <hammarlund at mailman.qth.net>
> Date: 9/1/2006 9:16:04 PM
> Subject: Re: [Hammarlund] HQ-170 OSCILLATOR STABILITY
>
> Bill,
> I have an HQ-170A with the same problem only mine takes over 8 hours to
stop 
> drifting. If you find the problem I hope you will post it on the
reflector. 
> I have not really pursued the drift problem yet, will tackle it when I
get 
> some other projects finished.
> 73,
> Larry K3JRR
>
> ----- Original Message ----- 
> From: "Magoo" <magoo at isp.ca>
> To: <hammarlund at mailman.qth.net>
> Sent: Monday, August 28, 2006 16:14
> Subject: [Hammarlund] HQ-170 OSCILLATOR STABILITY
>
>
> >I just aligned an HQ-170 and found that it took about 4 hours for the 
> >frequency drift to stop.  This after replacing the 6C4 oscillator and
doing 
> >the VR tube mod.  Any HQ-170 owners have the same experience?  My 75A-4 
> >settles down to the calibrated settings after about 1/2 hour, and even
my 
> >S-40 and HQ-129X settle out after about 45 minutes to an hour.
> >
> > Bill, VE3NH
> >
> > _______________________________________________
> > List Administrator: Duane Fischer W8DBF
> > ** For Assistance: dfischer at usol.com **
> > ----
> > http://mailman.qth.net/mailman/listinfo/hammarlund 
>
> _______________________________________________
> List Administrator: Duane Fischer W8DBF
> ** For Assistance: dfischer at usol.com **
> ----
> http://mailman.qth.net/mailman/listinfo/hammarlund