By : ElizaSukiman
YB 0 BAJ Indonesian
Amateur Radio Organization
This Mosfet Rf Amplifier will give you 800w output. The PA stage
consists of four push-pull modules ,with splitter and combiner. each comprising
a pair of IXYS 82N25P MOSFET devices. Each push pull is rated Po = 200W only.
They have an "on resistance" of 0.35 Ohms , will dissipate about 500W
each. V dss Drain Source Voltage 250 , Id Continuous Drain Current 82 A , C iss
input Capacitance 4800pF,Output Capacitance 900pF .
The Mosfet Rf Amplifier produce
800w from 24V on 80 , 500w on 160 and 40 M .
The circuit work with four push-pull modules ,combiner and
splitter The amp as shown needs 75W of drive for full output. The splitter
wound on a small tubing or toroid transformer with about one turn pri. and two
turns sec. The Combiner made from large ferrite tubes . The Switching power
supply is 24 Volts 100 A.
The standing current for this Amp.200ma for each mosfet.
Bias should be set to about 400 ma by adjusting the 10k Ohm pot
carefully! Remember these FETs can really draw some current!, to see . .
. schematic
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