"MMDVM" interfaces

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"MMDVM" interfaces

Post by troffasky » 26 Jun 2018, 09:48

Can these MMDVM interfaces be used for anything other than joining public networks like Brandmeister? If you're not familiar, it's a low-power [10mW] transceiver interface that can be hooked up to an Arduino [or similar] and passes a stream of digital audio to/from something [this is the bit I'm trying to get my head around] reachable across a network. It is not SDR so will be limited to whatever type of modulation it supports [ie, probably won't work with analogue NFM] but that means it will run from a tiny little computer.
I suppose what I am asking is, could I do something like use it as a parrot repeater? Connect a pair of them back-to-back across a network? I don't really have a use case as such, I'm just curious...

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Re: "MMDVM" interfaces

Post by bigbloke » 21 Aug 2018, 11:40

As I understand it there are two things they can be:

A repeater controller
A simplex gateway

As a repeater controller, they can run two analogue radios as though they are a DMR repeater

RX radio---\____MMDVM--USB--{Raspberry pi}-----network
TX radio---/

In repeater and gateway scenarios they require a master server to talk to in order to reach any network

Therefore to do anything "stand alone" other than a repeater requires a DMR master server

there is a linux one out there - but I dont know how mature it is. I know a few were in development but there was
some historical fallout and I think a number of these were dropped.

One last point - the MMDVM software licence of Jon' Naylor states in no uncertain terms that the MMDVM code is for amateur radio
use only
so your on rocky ground using it for other purposes



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Re: "MMDVM" interfaces

Post by radiogaga » 21 Aug 2018, 14:49

If you are thinking of LinDMR Master, no longer being developed. There is a legacy of it on GitHub but no doubt quite out of date.

I thought the MMDVM software allowed for “educational” purposes too?
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