[R-390] R390 PTO endpoint

[Jacques Fortin]

John,

The PTO end-point adjustment is at the same place in the 70H-2 for the R-390
that it is in the 70H-12 for the R-390A.
See the green coloured hex screw in the attached picture.
The Plastic Plug S701 is the access to the PTO heater temp. adjustment !

73, Jacques, VE2JFE

-----Message d'origine-----
De : r-390-bounces at mailman.qth.net <r-390-bounces at mailman.qth.net> De la
part de jgedde at optonline.net
Envoyé : 10 juin 2019 16:29
À : r-390 at mailman.qth.net
Objet : [R-390] R390 PTO endpoint

I've started to look into doing the PTO endpoint on my R390.  The PTO is
completely different than the Cosmos one on my R390A which I was successful
in calibrating, including linearity.  Where is the endpoint adjustment on
the Collins R390 PTO?  I can barely see a plug behind the transformer can.
Is that where it's hiding?  

 

My PTO also has a plastic plug screwed into a hole marked S701.  Behind the
plug is a hollow shaft with two notches to allow it to be turned with a
screwdriver.  What is that for?  It does nothing as far as varying the
frequency.

 

There is so much wealth of information online about the R390A and its
various PTO flavors, but not much about the R390 PTO.

 

73's,

John

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