Barry, which manual did you have in hand to check the cams alignment ? The two last manuals (The TM11-856 and the TM11-5820-357-35) are in error relating to the correct initial cams positions. The first Collins manual (1953) is however correct. I already posted about this: the TM11-856 became correct only if the corrections listed in the C4 changes document are applied, but the same error was repeated in the TM11-5820-357-35 without the C4 correction applied.
If the proper initial positioning procedure of the cams is applied, there will be no other problems encountered during the RF + IFs alignments. Leave the green gear in place: the positions of all cams should check correct if the initial positioning is done, BUT ONLY IF it was OK before you installed it ! Be aware also that the initial position of the cams and MC and KC tuning shafts is completely different than the R-390A ones. 73, Jacques, VE2JFE in Montreal -----Message d'origine----- De : [email protected] <[email protected]> De la part de Barry Envoyé : 26 août 2024 11:20 À : R-390 Mailing List <[email protected]> Objet : [R-390] R-390 Green Gear I've restarted working on the R-390. Hopefully I'll have the knobs repainted successfully soon but, in the meantime, I'm going back to the rest of the radio. When I started the front panel restoration project, in anticipation of removing the RF deck for cleaning, I installed the Green Gear in the position where it engages the gears (as opposed to where it's normally held for safe-keeping). In the interim, I'd forgotten I had moved it and have rotated both the KC and MC shafts. Now I'm not sure what that might have done to the gear/cam alignments. I thought that with the gear installed that way, it would lock any movement on those shafts but apparently that's not true. If I remove that gear now without placing the KC and MC gearing back to the positions where they were when I installed the Green Gear, does that leave the cams improperly aligned? If not, I can realign them but was hoping to avoid that if it isn't necessary. Thanks, Barry - N4BUQ ______________________________________________________________ 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
