[R-390] PTO

Fri Sep 3 22:11:03 EDT 2010

I did find the 2455 and 3455 points on the PTO; there was a ton of spurs and
trash audible on the general-coverage sandstate ersatz freq counter, but
every 100khz I can find the signal from the pto [which appears to have a
much slower tuning rate than the intermodded trash].  3455 is about 3 or 4
turns clockwise from the end stop; does that seem about right for a collins
pto?

Sanity check: 2455 equates to +000, yes?

73 de ka9egw

-----Original Message-----
From: r-390-bounces at mailman.qth.net
[mailto:r-390-bounces at mailman.qth.net]On Behalf Of ka9egw at britewerkz.com
Sent: Friday, September 03, 2010 7:37 PM
To: r-390 at mailman.qth.net
Subject: [R-390] PTO

The saga continues...it goes without saying the rf deck is now horribly out
of alignment.  I can get the rx to hear my sig/gen on the antenna input, but
that's about it.

Lacking access to a freq counter, but having a decent sandstate general
coverage rx, [a Rat Shack DX390 which is possibly too sensitive for this
use] how do I go about telling where the pto is really at?  I've got more
than my share of intermod and spurious mixing products and can blank the
receiver 50 times when tuned through 10 turns starting at the
counterclocksise.  [When I say 'stop' I mean that point where the resistance
of the bare pto shaft to my bare fingers just starts to increase marginally,
I am being very careful not to run the pto past it's physical limits...]

Assuming I'm at the full CCW stop on the pto, where should it be?  It's a
Collins PTO FWIW.

I won't even go into my planned 'someday' change to the Cosmos I have on teh
shelf...

Any help would be appreciated.

73 de KA9EGW

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