The repeater starts cycling and listens for DMR packets on the receive cycle. But a simplex DMR repeater sits in the receive mode and will sync with the first carrier to come up when an operator accesses it. The antenna ports (RX/TX) can either have their own antenna but will have better performance with a circulator in between them to feed a single antenna.ĭMR radios do a form of this today, albiet on two different frequencies to offer two voice paths. It's like having two, two stroke engines exactly operating exactly 180 degrees out of phase. Use a single HackRF1 and set it to time division multiplex once a carrier is detected (46 mS receive or transmit and 4 mS idle) on a single frequency to sync with another HackRF1 on the opposite cycle. I can think of another option but not with an analog GSM radio.
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