[R-390] PTO end point adjustment

[Larry Haney]

I adjust the EP with the PTO installed in the 390.  Be sure to follow the
instructions in the tech ref as it does make a difference which end you do
first.  I like to use a tool that David Wise suggested on Mar 10, 2009.
You can see a picture of it in my doc R390A Cosmos PTO Observations
<https://www.r-390a.net/R390A_Cosmos_PTO_Observations_LH_rev1.pdf> on page
16.  Thank you David.

Regards, Larry

On Fri, Nov 8, 2024 at 1:32 PM David Wise <d44617665 at hotmail.com> wrote:

> I used a metal-tip alignment stick cut down to a short length.  I could
> work it into the hole, then rotate it between thumb and forefinger.
>
> Dave Wise
>
> ________________________________
> From: r-390-bounces at mailman.qth.net <r-390-bounces at mailman.qth.net> on
> behalf of Jordan Arndt <Outposter30 at shaw.ca>
> Sent: Friday, November 8, 2024 1:25 PM
> To: Jacques Fortin <jacques.f at videotron.ca>; r-390 at mailman.qth.net <
> r-390 at mailman.qth.net>
> Subject: Re: [R-390] PTO end point adjustment
>
> Thanks Jacques...
>
> I've always done it without removing the PTO or the front panel...Now I
> have
> to find the tool I used to use...!
>
> 73...Jordan...
>
> ----- Original Message -----
> From: "Jacques Fortin" <jacques.f at videotron.ca>
> To: "'Jordan Arndt'" <Outposter30 at shaw.ca>; <r-390 at mailman.qth.net>
> Sent: Friday, November 08, 2024 1:03 PM
> Subject: RE: [R-390] PTO end point adjustment
>
>
> Hi Jordan,
>
> Y2K-R3, page 6-20 !
> You zero-beat at 7+000 then goes down to 7.000 and adjust end point in PTO
> for zero beat.
> Up to 7+000 and re-zero beat with the BFO only.
> Back to 7.000 and re-zero beat with the end point, and loop again.
> Both ends sold be aligned after few iterations.
>
> But I neve aligned my PTO when they were IN the frame...
> I used an external supply, frequency counter and the alignment dial:
> Set PTO output to exactly 2.455MHz (almost fully clockwise) note the
> position on the alignment dial.
> Go back (counter-clockwise) exactly 10 turns to same alignment dial
> position.
> Set output to 3.455MHz exactly using the end point adjustment.
> Go up (clockwise) to 2.455 MHz exactly: expect dial reading change and take
> note of the new reading.
> Go back again 10 turns to this new dial reading.
> Set output again to 3.455MHz exactly using the end point adjustment.
> Loop again a couple of times: the two ends will converge to the same
> reading
> after few iterations.
> Once the end points give the same dial readings, re-install the PTO in the
> receiver with dial at 7+000 and PTO at 2.455 MHz positions.
> Check operation.
>
> 73, Jacques, VE2JFE in Montreal
>
> -----Message d'origine-----
> De : r-390-bounces at mailman.qth.net <r-390-bounces at mailman.qth.net> De la
> part de Jordan Arndt
> Envoyé : 8 novembre 2024 14:13
> À : r-390 at mailman.qth.net
> Objet : [R-390] PTO end point adjustment
>
>
>     It's been a long time since I had to adjust PTO end points and I need
> some advice as to the best method.
>     Do I adjust the coil at the -000 end after setting the +000 end with
> the
> zero adjust or vice-versa..?
>     Help...73...Jordan VE6ZT
>
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