Because I never had build a high power amplifier before, I first wanted to build some kind of prototype with lower power. Let's say a power level of  approx 100Watts. It gives me the opportunity to get familiar with building, cooling, security measures, high power dummy loads, and first of all get all the measurement tooling on level. So, I know what I do, I don't fire of to many FET's, and don't burn my fingers accidentally.

 

This is the plan:

               Supply                Input              Output  Amp class   Filter         pre-att  security                 control         Enclosure    dummy load

proto 1  13,8V/15amp   QRX transc.   100W          E             only 20m     no      for no antenna,   simple(*1)    no                 available

proto 2  28V/20amp      FT-950             240W          B             20/80m       yes     +swr+temp           better)(*2)    yes for sec  make

proto 3  50V/30 amp     FT-950             600-800W  B             buy HF set   yes     maximum (*3),     full (*4)         yes               make

 

I want to make a good cooling block for proto 1 (proto3 capable) to do temperature measurements and make sure it cools 100%

 

(*1) with simple I mean measurement of Voltage, Ampere, SWR meter for feed back to the input power. If I forget to connect the dummy load or antenna, my FETs should not be fried.

(*2) Adding current attenuation to limit the maximum power, and adding temperature control to put down the input power if the temperature gets to high (to be decided yet how much is too high,...!).

(*3) Everything I can think off, input control, output control, etc.

(*4) Full dashboard on a PC screen, input and output spectrum, Power in and out, SWR, tuti