Good point -- I should swap out the feedthrough as well. There is only one in this case, for the power lead-in, but if it is growing internal whiskers or otherwise failing I could see it causing this symptom...
-- john, KE5FX > -----Original Message----- > From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com]on > Behalf Of Kit Scally > Sent: Wednesday, September 01, 2010 8:34 PM > To: time-nuts@febo.com > Subject: [time-nuts] Maser manual (2) > > > John, > > I'd put money on one of the feedthrough caps (easily damaged upon > installation) in the Maser for such small jumps. > >From memory, the 5065A uses SM components, but these could be guilty. > > I've learned many abstract things I'd never otherwise come across > in this thread on home-built masers. I for one would like to see > more mileage on this topic although I'm not sure there's $25k in > my "Xmas box" for the necessary parts to build one ! > > Kit > VK2LL > > >>>snip > The 5065A is showing occasional phase jumps on the order of 10-100 ps that > coincide with small spikes in the current drawn by the lamp > exciter, and I'm > leaning towards blaming the silver-mica B-E feedback capacitor. (It even > has the same designation in both instruments' service manuals, C2.) > Tom: this is why your BVA was appearing to jump when I measured it. :-P > > -- john, KE5FX > >>>snip > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.