Review on Songhe FM Transmitter Pickup Module - Mini Wireless Microphone for FM Emission - Wireless Audio Transmitter MIC Core Board V4.0 by Aaron Kindler
The fundamental frequency is half the specified operating frequency
When the FM receiver receives a signal from a 100MHz transmitter, the fundamental frequency of the transmitter is 50MHz. You hear the second harmonic in the FM receiver. The power level of a 100MHz signal is about 11dB below pitch. The power level of the fundamental frequency is about 10 mW.
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