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433Mhz Transmitter | 433Mhz RF Transmitter And Receiver | Radio Frequency Transmitter And Receiver | Frequency GSM, Santa Barbara County, USA | prices, reviews Teleysia - GSM Frequency Band & Management Part 2 What is RTL-SDR? RTL-SDR is a very cheap ~$25 USB dongle that can be used as a computer-based radio scanner for receiving gsm sniffing "hopping frequency" rtl-sdr ...