Filter gain drop off exponentially after the LC resonant frequency which is tuned at around 914 kHz
Transmitter designed for 540kHz to 1400kHz
Input is +-30mv
The local oscillator is realized using 555 as VCO, you can control the frequency by adjusting the voltage in CONT pin.
The message is mixed using H-bridge transistor driven by local oscillator, then the RF output is filtered to reduce the harmonics.
