From: Tom Evans 
Subject: Re: [drakelist] TR7 frequency shift


Tom Evans  made an utterence to the drakelist gang
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This site seems to have the original Drake instructions.  It describes them as 
"'PTO Braid Modification' to cure frequency jumping problems, as
directed by R. L. Drake, Ohio"

http://www.alg.demon.co.uk/radio/tr7/mods.htm#10

-Tom, AG9X


On Wed, 23 Feb 2005 19:58:26 -0600, Tom Evans  wrote:
> Mike,
> 
> One of the Drake-supplied mods I performed on my rather early TR-7
> was to add a braid to the PTO.
> 
> See http://www.wb4hfn.com/DrakeArticles/TechTips/PTO-Repair.htm
> 
> See if yours is missing the grounding braid.
> 
> -Tom, AG9X
> 
> 
> On Wed, 23 Feb 2005 18:34:49 -0500, Mike Williams
 wrote:
> > Well, here is the problem...The Tr7 is solid with the exception of a slight
> > warble in the receiver.  When sitting on a frequency listening to a cw
> > signal or just tuned to the calibrator, the frequency will shift perhaps 80
> > or 100 cycles.  Enough to be audible and annoying.  This started shortly
> > after I cleaned the main shaft of the PTO with De Oxit and followed up with
> > a clean q tip to remove the residue.  I have cleaned the PTO's on my 4 line
> > many times and not experienced this.  I think it is the PTO but I thought I
> > would throw this one out to the group for comments and advice.
> >
> > As always, thanks for any input!
> >
> > Thanks,
> >
> > Mike W4DL
>
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