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PM 40 it's an rf power amplifier designed for
Medium frequencies.
PM 40 output power is 40 Watt with a 50 Ohm load. The
circuit amplifies the original signal 26dB with 28V
power supply.The circuit quiet current is 250mA.
On-board there are two five pole low pass filters. The
first one's frequency is 1MHz and the second one's 1.8MHz.
The filter's are switched with a relay.
The amplifier, consist of one amplifying stage with
active component a MOS - FET. Specifically the amplifier
uses the IRF540.
Input output resistance adjustment is achieved with
wide band transformers.
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