Rf Amplifier For QRP
Eliza Sukiman. ( YB0BAJ )
This Rf AmplfierFor QPR has made from low
price Mosfets . The MosFets are WO12L54F or any mosfet like IRF250,IRF450
can use for these .
The circuit is a Push Pull with 2 pcs and two band Low pass Filter for 3,5 Mhz and 7 Mhz.
The Rf Amplifier For QRP as shown needs 1W only of drive for full output.
The circuit is a Push Pull with 2 pcs and two band Low pass Filter for 3,5 Mhz and 7 Mhz.
The Rf Amplifier For QRP as shown needs 1W only of drive for full output.
The input
transformer T1 is wound on a small tubing transformer with about one turn pri.
and three turns sec. The thermal sensor contact with the heat sink and well
decoupled to prevent Rf pick up .The output transformer uses large
ferrite tubes . The primary is one turn of tubing transformer and the secondary
is 3 turns of thinner multi strand stuff .
The power supply
for this Rf Amplifier doesn't need regulating and 12v
enought for full power output 50w
The standing
current should be set to about 200 ma by adjusting the 10k Ohm pot . you can
see . .Schematic
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