I did the grinding with the dremmel head and transistor in a large plastic ziplock as a make shift glove box. Some water was in the bottom of the bag to act as a dust capture. Hard to run the pliars though.
On 3/21/08, Stu Benner <[EMAIL PROTECTED]> wrote: > > I am ignorant about the particular parts you are discussing. However, > caution should be used when dealing with ceramics such as this. They may be > Beryllium oxide which has excellent thermal conductivity and electrical > insulation properties, however, it is a carcinogen. A web search will reveal > lots of information on the material. > > Regards, > Stu > W3STU. > > -----Original Message----- > *From:* [email protected] [mailto: > [EMAIL PROTECTED] *On Behalf Of *DCFluX > *Sent:* Friday, March 21, 2008 11:48 > *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. > > >
