[R-390] More 51J-3 PTO Fun

[Tom M.]

Gentlemen?  

Last week I reported that my PTO doesn't "O."

I found that the PTO was missing its bypass caps (I went in to replace them and
they were gone)."  The unit actually had a crude solder job done on the cover
so I smelled a rat.  When it worked, it also had the freq vary with operating
voltage, so I figured a kluge was in there somewhere. Still not sure what is
wrong with it, but since it acted funny all along and now did not work at all,
I went to the parts bin for a spare.

The spare had a s.n. of > 9000, and the circuit cover was screwed down instead
of soldered down, a great improvement.

I went into the spare and replaced the bypass caps (which were set up
differently than the schematic, not sure why) and then powered it up.  The
endpoint was 15 kcs long (or is it short?), anyway, in the usual direction.

I tried the one turn removal trick and this did not do the job. Still 9 Kcs out
 For the first time I had to remove two turns to bring it in.  This worked, but
of course the adjustment range is very skinny (since the adjustment coil is
almost gone).

Anyway, the PTO is in the oven right now getting Hurricane Lili baked out of it
(eat cereal for supper, this is important!).

This is all very difficult to explain to the neighbor why I'm doing this for a
radio to listen to in the shop.

Cheers

Tom N5OFF  

 

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