Australian Amateur Radio Station
The amplifier depicted below was based around a board layout designed by
Each board utilises 2 X MRF646 transistors to deliver ~100-125 W on 432 MHz.
2 of these boards were combined using a coaxial Wilkinson combiner
to produce 250W PEP output.
The driver stage was also designed by VK3BRZ and it utilises a single MRF646 to produce 50 W of
RF, that is then split to drive each of the main boards.
An excellent full description and constructional notes can be
found on the site of
Numerous boards have now been reproduced predictably. Carlo and I have individually and
successfully combined 2 of the boards to produce a 200-250 W PEP "desktop"amplifier for 70cm
with modest cost.
|Additional Notes on construction: