One of the main issues with Beryllium Oxide is to not breath any of the dust when it breaks, is ground on or sanded. I work with it every so often and actually can and do repair broken Beryllium oxide parts for industry, which include some of the blocks found in rf amplifiers.
cheers, skipp skipp025 at yahoo.com > "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. >
