Delrin (polyacetal) is a bad choice for RF applications. Its dissipation factor is too high. It is a great "engineering plastic" meaning it is strong physically but it is too lossy. Teflon (tm) is the best, also rexolite for RF. Also most any ceramics. Corning has a line of "machinable" ceramic if you can find it that works great for RF.
A good test for RF suitable plastics is to put them in a microwave oven and run it for 10-30 seconds. If the plastic gets hot or even warm, it is unsuitable or a poor choice for RF. Burt VE2BMQ skipp025 wrote: > Re: question about motorola t1500 series cans > > The melting was probably done by high circulating current within > the duplexer cavity. Typical for this type operation. Replace the > plastic parts with a better (non-plastic) insulator with the proper > D-factor and you'd be able to rock and roll again using the same > bottle. Delrin and certain grades of teflon are popular internal > insulators. > > Relative to the same size and types of T-1500 bottles, there > shouldnot be a lot of other things to go wrong inside the cavity. > > cheers, > skipp > > ps: don't forget to replace any plastic SO-239 coax connectors with > better quality parts. > > >> "Phil" <[EMAIL PROTECTED]> wrote: >> >> I have a set of t1500 series cans that i need to know if they are 250 >> watt or 60 watt. How can i tell? Was wondering because i ended up with >> melted notch coupling insulators. I was running 75 watts to the >> duplexers. >> > > > > > > > > Yahoo! Groups Links > > > > >
