[Boatanchors] Stability de W7ZFB

[msix@nmia.com]

On Fri, 16 Apr 2004 fkamp@comcast.net wrote:
> I have had three Hallicrafters rigs.  S-85, s-40b, and SR-150.  The only
> one that I thought was a little drifty was the SR-150.  Probably because
> I did not try to use the s-85 and s-40b on rtty.
>
Well, Bill Halligan holds the patent on LO and VFO drift and AFAIK
Halli never sued anyone for patent infringement :)

Halli didn't get their arms around the problem until very late
in the game, perhaps SX-101Mk?? or later...

SR-150 drift isn't the VFO. It's the HFO. For some strange reason,
Halli didn't put the HFO on 150V Reg. As a result, the xtals drifted
with B+. Putting it in 150V Reg fixes the problem. Quite stable...
Halli finally got wise and regulated all the later xcvr HFOs.
73 John W7ZFB