OMG - didn't realize that was there since it is "sealed shut". I guess I know what my project's gonna be for this wet weekend ;-)
In my defense - I'm sitting here at work without my CD (and posted the query from work) and I put everything down last night at around 10.30. It's also looking like I'm going to have to dig into this thing now, so I may start undoing some of the mods. The way the PO played with the variable AGC delay, for instance, has completely messed up the functioning of the RF GAIN control. Oh, well - we need things to keep us busy. Guess I need to keep the CD in my briefcase :) Thanks again - Steve, W1ES/4 -----Original Message----- >From: Garey Barrell <[email protected]> >Sent: Sep 23, 2011 9:52 AM >To: Steve Wedge <[email protected]> >Cc: "[email protected]" <[email protected]> >Subject: Re: [Drakelist] Anyone ever look inside the PBT box? > >Steve - > >Um, if you would bother to look at your B-Line CD, in the MISC directory, >there is a file called 'PB >Tuner Mechanical'. Hidden in there is a procedure for opening, cleaning and >closing the PB Tuner!! > >The problem is the same as the PTO, the original grease has hardened and is >not allowing the slug >carriage to move smoothly. > >As some have said, 'RTFCD!!' :-) > >73, Garey - K4OAH >Glen Allen, VA > >Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line >and TR-4/C Service Supplement CDs ><www.k4oah.com> > > >Steve Wedge wrote: >> I was realigning my "hot-rodded" R-4B last night (the PO had moved some >> things around for some reason - probably to change where the beat note would >> peak) and got to the adjustment of the four-slug PBT rack or coil carriage >> (whatever it is). >> >> Moving the PBT in 4.8 from 9 to 3 o'clock had different sounds (indicating >> it needed to be re-centred), so I started turning the central screw. I got >> to a point where the PBT wouldn't tune ANYTHING, so started returning it to >> closer to where it was. Still no change. It seemed the carriage wasn't >> moving in and out anymore. I don't know what happened, but turning that >> central screw in more finally allowed me to use the PBT again, but now it >> was off. I re-peaked the four coils again and it seems to be working, but I >> do notice that USB sounds bassier than LSB, so this thing's still not right. >> >> It appears that the central screw applies tension to the whole carriage and >> moves the entire assembly in or out in unison. >> >> What can break in there, and has anyone taken the shields off one of these >> puppies to work on the innards? The process will involve breaking solder >> joints, so I don't want to take apart anything that will fly apart like the >> recoil mechanism of a chainsaw (DAMHIKT...). >> >> 73, >> >> Steve. >> >> _______________________________________________ >> Drakelist mailing list >> [email protected] >> http://mailman.zerobeat.net/mailman/listinfo/drakelist >> _______________________________________________ Drakelist mailing list [email protected] http://mailman.zerobeat.net/mailman/listinfo/drakelist
