I once bought a pair of low power 315 MHz TX/RX modules and was going to try
them in a model rocket + GPS. I tested them with a serial port and they had a
range of a couple thousand feet at 1200 BPS. But when the transmitter was
connected to the GPS, the GPS lost lock... turns out 315 MHz * 5 is the GPS
carrier frequency. They would totally jam GPS over around a mile diameter.
Also the maker of the modules stopped selling them and actually disavowed that
they ever existed!
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