[Hammarlund] HQ-170 OSCILLATOR STABILITY

[Les Locklear]

It is a Hammarlund HQ-180-AX. It was widely available, not built for the 
Coast Guard or anybody in particular. Also was available as a rack mount 
version, HQ-180-AXR.

Les Locklear
Gulfport, Ms.
DX'ing Since '57
http://www.hammarlund.info/

----- Original Message ----- 
From: "Greg Mijal" <bluebirdtele at earthlink.net>
To: "Larry Harrison" <harrisonl at comcast.net>; <hammarlund at mailman.qth.net>
Sent: Sunday, September 03, 2006 12:31 PM
Subject: Re: [Hammarlund] HQ-170 OSCILLATOR STABILITY


> 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
>> >
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>
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