Setting up DMR using promiscuous mode

[5600]

Is it possible to look for DMR activity on an ad-hoc basis? If I'm mobile for example, can I "scan" for DMR activity between a certain range without having to know a repeaters RX if I'm using promiscuous mode?

Im a bit confused as it seems that I need to know the repeater before promiscuous mode will listen for anything? If this is the case, how do people find what to listen to for things like security on a building site, or even workmen on a building site etc. if they don't already have the repeaters RX details?


I may have this all backwards!

 

[serial14]

What sort of radio or receiver are you using?

If you happen to be using an Uniden Scanner with the DMR license upgrade, then yes you can scan a range of frequencies. When the Uniden comes across a signal that happens to be DMR based, it'll automagically start decoding the DMR audio if possible and even display various bits of information on the screen about the signal.

 

[Whiskey3JMC]

how do people find what to listen to for things like security on a building site, or even workmen on a building site etc. if they don't already have the repeaters RX details?

in the USA, search the FCC. If you can't find a site listing, use a scanner with close call, though this may not work for DMR simplex ops

 

[hiegtx]

n the USA, search the FCC. If you can't find a site listing, use a scanner with close call, though this may not work for DMR simplex ops

The Digital Frequency Search website can help you search licenses in your area that contain the emission codes for DMR, NXDN, or P25. Just because a company, or public safety agency (such as police, fire, or EMS) is licensed to use DMR, NXDN, or P25 does not guarantee that that transmission mode is in use; only that is legal for them to do so. I've run across a number of licensees, including businesses and some public agencies (particularly in some of the rural areas here in North Central Texas) that are licensed to use any or all of those digital modes should they choose to do so, but, for now, are still using analog transmission equipment. They've added the license modes for DMR, among others, just in case that if, at some point, they want to upgrade, they are already licensed to use one of those modes without submitting a new request to the FCC.

 

[IC-R20]

Yes, yes you can. I used to do that with the Tytera MD380. Most commercial radios don't have a limit search though so it will do the full band split of the radio, 400-480mhz for example. So it's better to program a list of potential DMR frequencies you're trying to decode into the radio and do a scan in channel mode instead.