Re: What makes a digital voice capable repeater dv capable?
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Something I haven¡¯t seen mentioned in the thread below so far: a proper digital repeater will apply error correction to the received signal before retransmitting it as a clean digital waveform. There¡¯s normally a bunch of FEC / parity on digital voice. In the case of a moderately noisy input signal, it may be possible to fully reconstruct 100% of the speech, and then turn around and retransmit it with reconstructed parity. Simply tweaking an analog machine to pass unfiltered audio will obviously not be able to do that. Something like an MMDVM board ought to help, though. 73, Matt, N1ZYY On Sun, Jan 10, 2021 at 11:57 Eric Fort <Eric.fort.listmail@...> wrote: What makes a digital voice capable repeater dv capable?? Is there nothing special about it and hence I can just transmit digital voice such as p25, dmr, c4fm, or d-star to the analog (fm) repeater and expect it to work?? ?Or is there something extra or special inside these dv repeaters that allows them to repeat whatever type of digital voice that they do?? If so what is it and what can be done to use an older fm repeater such as a quantar or msf5000 as a repeater for one of the dv modes available. How does this approach compare with just simply buying a dedicated purpose built box for the digital mode of choice? |
Matt Wagner