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ism band
Transmitting FM, AM, SSB, SSTV and FSQ with just a Raspberry Pi
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An off-the-shelf RTL-SDR unit.
oregon scientific
RTL-SDR for VHF Air Band AM on GNU Radio
SX1280 2.4GHz SMD UART Transparent Transmission LoRa FLRC GFSK Modulations E28-2G4T12S IPX/PCB Antenna Wireless Transmitter - AliExpress
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freedv