BUILDING A HOMEMADE FM REPEATER WITH A RASPBERRY PI, RPITX AND RTL-SDR DONGLE
A radio repeater is usually a radio tower that receives weak signals from handheld, desktop or other radio, and rebroadcasts the same signal at a higher power over a wide area at a different frequency. This allows communications to be extended over a much greater area.
Repeaters are generally made from expensive professional grade radio equipment, however ZR6AIC has been experimenting with creating an ultra low cost repeater out of a RTL-SDR and Raspberry Pi. In his system the RTL-SDR dongle is set up to receive a signal on the 70 cm (420 – 450 MHz) amateur radio band, and then retransmit it using Rpitx on the 2M (144 – 148 MHz) amateur radio band. He also adds a 2M low pass filter to the output of the Raspberry Pi to keep the signal clean.
https://www.rtl-sdr.com/building-a-homemade-fm-repeater-with-a-raspberry-pi-rpitx-and-rtl-sdr-dongle/
A radio repeater is usually a radio tower that receives weak signals from handheld, desktop or other radio, and rebroadcasts the same signal at a higher power over a wide area at a different frequency. This allows communications to be extended over a much greater area.
Repeaters are generally made from expensive professional grade radio equipment, however ZR6AIC has been experimenting with creating an ultra low cost repeater out of a RTL-SDR and Raspberry Pi. In his system the RTL-SDR dongle is set up to receive a signal on the 70 cm (420 – 450 MHz) amateur radio band, and then retransmit it using Rpitx on the 2M (144 – 148 MHz) amateur radio band. He also adds a 2M low pass filter to the output of the Raspberry Pi to keep the signal clean.
https://www.rtl-sdr.com/building-a-homemade-fm-repeater-with-a-raspberry-pi-rpitx-and-rtl-sdr-dongle/
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