DMR explained with a few words

When I first started with DMR my head started spinning and my consumption of pain killers against head-pain raised dramatically. After a while – understanding the concept – I can say that my analogue Yaesu FT857 is more challenging in terms of settings, than my Anytone DMR radios. Well I am deep into Computers since 1980 which is an advantage for sure. But if you are familiar with Excel (or Ron’s CSV Editor which I prefer due to simplicity), you are nearly there.

DMR is not complicated, it is complex. The other problem you will find is that many information’s in the internet is either wrong, outdated, not very clear or goes too deep into details which are not important for the programming of a radio by the Codeplug (CP) -Software. Basically the whole thing consists of a channel list (analog and digital frequencies named by repeater or the use of it), Zones where you group your frequencies logically (i.e. by country or region), a Talkgroup-list of Talkgroups (TG) you are interested in (World, local, regional, country, state, county, language or specific use like emergency comm.)

You personally need an CCS7 Identifier, a seven digit number which represents you in the DMR (and DStar) network. For Europe and Africa, you can register here. North America, South America, Asia and Oceania must register here. In both cases you have to upload a scan of your License.

DMR user details are available in a CCS7 Database which is ready for download in the internet. Downloaded and imported to the radio, you will see each station with additional information like Call-Sign, Name, City, State, Country.

Further more you have to deal with two Timeslots (TS) named TS1 and TS2 as on one frequency two QSO’s simultaneously can be held, a color code which has to be the same in your frequency list as the correspondign repeater you want to use.

Finally you will find static talkgroups and dynamic talkgroups associated to TS1 or TS2. Which talkgroups are associated to which Timeslot you can find out on the website of your repeater or at the Brandmeister / DMRplus pages of the desired country. The difference is that a static TG is always there, if you want to join a TG which is not static (=dynamic), you choose the talkgroup of your liking in the radio, select it, press PTT and you are subscribed (dynamically) to it with an inactivity timeout of 6-10 min. if you do not have a qso, otherwise you have to press the PTT again. Both kind of TG’s can be on any TS.

 

Was it that hard ?

 

More useful information can be found on the useful links page

 

DMRplus, Brandmeister, etc., which network to use ?

I personally prefer Brandmeister (BM), others DMRplus (D+), DMR-MARC etc.. Actually you can use all, if you have many different local DMR networks, just in one radio. The only thing you should take care of is to name channels and talkgroups in a way that you can distinguish which repeater does what (BM, D+, DMR-MARC etc.). If I would use more than one network, my repeaters would be named i.e. “D+ DB0PBS” or “BM DO0ERK” and so on.

The same should be done for Talkgroups (TG’s). Brandmeister’s world Talkgroup is TG91, DMRplus uses TG1 for woldwide. Therefor I would name the TG’s “D+ world” (=1) and “BM world” (=91) in the Talkgroup list accordingly, like in this example: TalkGroups marked for Brandmeister (BM). The only thing I have to do now to switch between the networks, is to use the right repeater with the right Talkgroup.

Of course there are are Multi-Net Bridges (Interfaces between different networks like DMRplus, Brandmeister and technologies like C4FM, DStar etc.) available in each of the networks. I never used them or played around with them, therefor pls. do your own research in the internet. This presentation gives you a bit more information.