This diagram shows the transmitter section.
It is straight forward. The mixer mixes the signal from the synthesizer with the 10.7 MHz signal from the FM modulator. The result is a 144 MHz signal. This signal is filtered and amplified. I have used several band filters to remove unwanted mix products. Finally the signal is amplified by a power module to 5 Watt. I have cascaded 2 low pass filters to get rid of the harmonics.
Tests with a spectrum analyzer have to be performed to check if the filtering is OK.
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