These small transmitters operate on 433.860 + - 20 kHz.
Connecting the 16.5 cm antenna wire to the PCB did not significantly extend its range,
but the frequency dropped about 10 kHz.
Connecting external antenna via coaxial cable caused the frequency to drop by more than 200 kHz.
Transmission with a 16,5 cm antenna helical wound gives a stronger signal than a stright wire measured on a nearby SDR receiver.
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