I used the one that normally tunes the driver to the final. Yup I sorta have a grave yard of known dead PPL-6060s, some were bad recievers, others didn't transmit. I guess I should mark them.
On 3/21/08, Paul Finch <[EMAIL PROTECTED]> wrote: > Which of the tuning capacitors did you have to use from the PPL? I hope it > was not that really little one, they cause more problems than anything. > Wow, you had to try three PPL's before you found a good PA transistor? That > is unusual, in the shop I worked at we seldom changed one, had more problems > with the driver and pre-driver than the final. > > Paul > > > > -----Original Message----- > From: [email protected] > > [mailto:[EMAIL PROTECTED] On Behalf Of DCFluX > > Sent: Friday, March 21, 2008 10:48 AM > To: [email protected] > > Subject: Re: [Repeater-Builder] Anyone have a Motorola house part number > secret decoder ring? > > > I had to grind the flange and ceramic of the 4062 with my dremmel to > make it fit the PCB in the FT-857D. Took me 3 PPL-6060s from my scrap > pile of Johnsons before I found another one with a working final > transistor. The first transistor I salvaged didn't have the ceramic > ground down enough so when I was tightening it down with a loud pop > the ceramic seperated from the copper flange. Pissed me off because it > was still a good transistor. > > Had to rebuild the triplexer feeding it. I don't know what it is but I > have seen a rash of PCB spontanious combustion in Yaesu UHF radios. > This one was burning a hole under one of the chip inductors. I don't > know, maybe FR4 doesnt like UHF? > > I also had to grab a tuning cap from the Johnson to fine match the > transistor on UHF. > > Got it doing 15W on UHF and 40W on VHF. It works, just not as good as > the original, About a dB and a half down, but it's cheap so who cares? > I got 46W on VHF but started to have thermal fold back problems. > > > ------------------------------------ > > > > Yahoo! Groups Links > > > > > > No virus found in this incoming message. > Checked by AVG. > > Version: 7.5.519 / Virus Database: 269.21.8/1337 - Release Date: 3/20/2008 > 8:10 PM > > > > No virus found in this outgoing message. > Checked by AVG. > > Version: 7.5.519 / Virus Database: 269.21.8/1337 - Release Date: 3/20/2008 > 8:10 PM > > > > > > > ------------------------------------ > > > > Yahoo! Groups Links > > > >
