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Eliza Sukiman
YB 0 BAJ Indonesian Amateur Radio Station
This is my base station of MosFet Rf Amplifier. The
MosFets are APT5020BN ,I have used them in my base station and they produce a
good 600w from 36V on 160 and 80,and 400w on 7 Mhz. , I've had 600w out of four
at 36V on 160 with a one turn primary / four secondary on the output
transformer. (Tubing Transformer).
The circuit is basically the same but this is two devices with
combiner on each side of the push-pull. The golden rule is to use a fet capable
of withstanding three times your maximum supply voltage.
lets see . . . Schematic
see demo 300w... Click Here
See Youtube 600w ... Click Here
See Youtube 800w ... Click Here
New power-MosFets coming out every week or so, look for ones with
a low Rds-on and high power dissipation. The main drawback is the high gate
capacitance, several thousand pF, which makes them hard to drive above 7MHz.
Check out IRF , IXYS and APT ( FET manufacturers).test its behavior.
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