Like one of the 50pf is open… Jacques, VE2JFE in Montréal (more or less).
Le 1 août 2025 à 18:59, Barry <n4...@knology.net> a écrit : Hi Renée, I'm not sure I follow this. Are you saying it will _only_ tune from 463 to 479 kc? Barry - N4BUQ > R390 70j-3 BFO has an interesting issue- one I have not seen before. Z502 > tunes from 463 to 479 kc, stable and good signal per spectrum analyzer. > checked all external parts- all withing spec, opened unit, all parts > present ( someone has opened it the past seal was broken). "Things" look ok. > moving core appears to be intact does not appear to have been tampered. > Before I go any further anyone with thoughts? > - any known loss of permeability of the core? possibly due to temp? > caps internally go "bad" 1600pf, 50pf NPO, 50pf N600.......there is not > much in there as per schematics...simple hartely osc. > the core does not go completely to the end of the form, maybe couple mm > from end. but does cover the coil length. > How do get the core out for inspection? I saw where someone else had > epoxied one back together.....but no notes on full disassembly. > So....If it is non repairable...anyone have a 70j-1 or a -3 available? > Renée, K6FSB > ______________________________________________________________ > R-390 mailing list > Home: http://mailman.qth.net/mailman/listinfo/r-390 > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:R-390@mailman.qth.net > > 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:R-390@mailman.qth.net 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:R-390@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
