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Today I made some modifications to this is a new project for a GPS to FM radio tracking device for rockets i.e. the V2. The initial design lacked the antenna impedance matching circuit which caused problems with the end amplifier. Also I increased the possible choices of frequencies, see the table further down. Now instead of soldering and de-soldering tiny resistors, the frequency and the transmitting modes are selected via a DIP switch.
GPS RECEIVER TO FM RADIO (88-107 MHz) AUDIO + RDS TRACKING V2 – [Link]
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