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 <[email protected]> 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: [email protected] <[email protected]> on > behalf of Jordan Arndt <[email protected]> > Sent: Friday, November 8, 2024 1:25 PM > To: Jacques Fortin <[email protected]>; [email protected] < > [email protected]> > 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" <[email protected]> > To: "'Jordan Arndt'" <[email protected]>; <[email protected]> > 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 : [email protected] <[email protected]> De la > part de Jordan Arndt > Envoyé : 8 novembre 2024 14:13 > À : [email protected] > 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 > > ______________________________________________________________ > R-390 mailing list > Home: http://mailman.qth.net/mailman/listinfo/r-390 > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > > ______________________________________________________________ > R-390 mailing list > Home: http://mailman.qth.net/mailman/listinfo/r-390 > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > ______________________________________________________________ > R-390 mailing list > Home: http://mailman.qth.net/mailman/listinfo/r-390 > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > ______________________________________________________________ R-390 mailing list Home: http://mailman.qth.net/mailman/listinfo/r-390 Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
