Here will come a desciption of homemade or modified surplus power amplifiers for the HAM bands.
For the 4m (70MHz) band i have modified a 1KW surplus transmitter:

4M 300W LDMOS PA

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Here will come a desciption of homemade or modified surplus power amplifiers for the HAM bands.
For the 4m (70MHz) band i have modified a 1KW surplus transmitter: