Paul, I've been thinking the same thing. I hate to tear them apart again, but I want to clean the metal-to-metal surfaces again.
I can hear the fingerstock scraping against the inner tube... not a BAD scraping... just what sounds like good metal-to-metal contact. I was also thinking about cleaning the mating surfaces on the top... just need to get the gumption to do it. I'm getting tired of having my butt kicked! Thanks es 73, Mike WM4B > -----Original Message----- > From: Repeater-Builder@yahoogroups.com [mailto:Repeater- > [EMAIL PROTECTED] On Behalf Of Paul N1BUG > Sent: Tuesday, October 07, 2008 6:58 AM > To: Repeater-Builder@yahoogroups.com > Subject: Re: [Repeater-Builder] Desense has me pulling my hair out! > (Was DB4060 Duplexer Cables > > Mike Besemer (WM4B) wrote: > > I have a strange feeling that it's arching around the fingerstock. > The > > inner tuning tubes showed definite signs of wear, but I THOUGHT the > > fingerstock was making good contact. Is there any 'approved' > conductive > > lubricant for that area? > > Your problem sounds a lot like the trouble I was having with my > DB4062 (the 6 cavity version of the 4060). I would get it tuned and > think all was well, only to have major desense the next day. It > nearly drove me nuts! > > What happens desense-wise if you tap lightly on the big tuning knobs > while the transmitter is running? > > Do the cans make a nice scraping sound when you turn the knobs > during tune up? > > Mine had the moving part of the center conductor and the finger > stock coated with some kind of lubricant, which had partially dried > up and was interfering with contact. Check the coil springs around > the finger stock to make sure they are applying adequate pressure > and are not stretched out. I also recommend you check and clean > EVERY metal to metal mating surface, including where the box > containing the coupling loop bolts to the cavity top. I wrote up > something (incomplete) on my restoration project, which can be found > here: > > http://www.repeater.n1bug.com/duplexerrefurb.html > > I think Mike Morris was going to put this on the repeater-builder > site, but I don't see it there yet or I'd have given that link > instead. (Mike Morris: I can supply a version of this minus the > DHTML menu etc. if you want it) > > Almost one year since the restoration now and all's well... > > 73, > Paul N1BUG > > ------------------------------------ > > > > Yahoo! Groups Links > > >
