[R-390] PTO 70H-12 problem

[Steve Hobensack]

Hello Clemens,
I had that problem a while back. I found a small solder glob shorting the 
turns at the terminal point on one of the compensator coils (cosmos pto). 
You need a magnifying glass. There were only 3 or 4 turns. Be sure they are 
not shorted together. Hope this helps, 73...Steve..KJ8L






>From: "Clemens S.Ostergaard" <clemens@it.dk>
>To: r-390@mailman.qth.net
>Subject: [R-390] PTO 70H-12 problem
>Date: Sun, 26 Jan 2003 17:30:26 +0100
>
>Hi everyone,
>
>A "new" EAC R-390A  being renovated  (recapped, etc.) has turned out to
>have a problem preventing calibration. The PTO variation is insufficient,
>with the end-point adjustment screw all CCW it covers 977.13 kcs, all CW
>983.55 kcs. A friend of mine, who has the sufficient skill and learning,
>took it apart and it proves to have been tampered with: windings off the
>adjustment coil and the linearity-coil also seems to have been maltreated.
>White salt-like deposit all over the insides, but this is perhaps not so
>grave. I have (large) digital pictures if anyone wants. Mechanically it
>seems OK and it was functional, though sometimes with a kind of slight
>wobbling when tuning through a heterodyne.
>
>Here in Europe, spares are not thick on the ground, so I reckon my best
>chance is to ask the list if anyone has a spare PTO to sell. Payment in
>unmarked dollarbills, hi. Alternatively, does anyone have positive/negative
>experiences with PTO's from Fair Radio?
>
>And while I am asking questions: why not put either the training manual
>TM-4000 or the STP called "Troubleshoot the radio receiver R390A/URR to the
>faulty component" on the phenomenal R390A website?
>
>Best,  (and hope to hear from you)
>
>Clemens S.Ostergaard
>Aarhus, Denmark
>
>R-390A's, SP-600, 51J-4,  and searching..
>
>
>
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