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


Tom Evans  made an utterence to the drakelist gang
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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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