I experimented a little with VCO from Nokia phone (R0464), added an RF amplifier and a microphone. The range of this fm bug is up to 1km with full CR2032 battery and good conditions. As the battery discharges, the range s as well as the TX frequency. The bug can be received at a frequency of around 430 MHz and that depends on the battery voltage.
Source: Elektronika-ba
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