Kevin, Thanks for all of your information. When we get deeper into this project I am sure I will be talking to you more in-depth about the dual module PA. Milling the Micor PA deck is not a problem for me as I do a lot of metal work as well. I can see where the adapter would work very well for those who do not have knowledge or access to a milling machine.
Joe - WA7JAW --- In Repeater-Builder@yahoogroups.com, Kevin Custer <[EMAIL PROTECTED]> wrote: > > Joe Burkleo wrote: > > Kevin > > Thanks for the information. I figured that if anyone had tried it you > > would be aware. > > > > I was just looking for more than 30 Watts out. > > > > Scott and I have been successful in building small IPA's (intermediate > power amplifiers) that take the power from the exciter and make 3/4 to 1 > watt with a single transistor. This stage then feeds a Wilkinson power > divider and it feeds two of these brick devices. Another WPD is used to > combine the power. About 75 to 80 watts is possible. We have a > prototype that has one brick module (as the IPA) feeding four more, and > over 150 watts is possible. > > We never fully developed the 150 watt high-power version because the > single brick PA we build will easily deliver enough drive for any good > external 220 PA, however we do have several of the 75 watt versions in > service. > > Can these modules be considered continuous duty if they are properly > > mounted on a Micor station PA chassis. > > > > Absolutely - especially if running one or two modules. > > In addition, we actually use the MICOR power set control to retain all > of its features (SWR protection, power leveling, etc.) The AMP BD that > Scott builds has the pass transistor built on it and it is run from the > power set control lead that originally went to the MICOR PA. > > Scott also builds a custom heat spreader that is used to mate the module > to the MICOR heatsink. This eliminates the need to machine a flat spot > on the heatsink that big enough for the surface of the module. While > Scott doesn't advertise these, I feel sure he would sell them > individually; they are used in /our/ custom 220 MICOR conversions. The > heat spreader is not necessary in a MASTR II conversion, as there are no > protruding 'bosses' for the original mounting of the RF power output > transistors. The pictures in this document shows the mounting > arrangement he has developed: > http://www.repeater-builder.com/products/ampbddocs.pdf > > Good luck and let us know how you make out... > > Kevin Custer > Repeater Builder >
