DMR leiutati algselt aastatel 2005-2009, kui moodustati DMR assotsiatsioon, et kontrollida selle režiimi kasutamist kaubanduslikus keskkonnas.
Algselt oli see ainult kommertsprotokoll, enne kui amatööride kogukond selle kasutusele võttis. See kasutab 4FSK (Frequency Shift Keying) ja TDMA (Time Division Multiple Access) ning on kodeeritud AMBE+2 koodekiga. Olemas on DMR-võrgud, mis ühendavad repiiterid interneti kaudu. Üks asi, mida sageli valesti mõistetakse, on see, et DMR-i võib kasutada simpleksina nagu iga teist digitaalrežiimi ja mitte kunagi kasutada ühtegi Interneti-funktsiooni. DMR-i eelised on see, et kuna see režiim on algselt kommertslik, siis on saadaval olevad raadiosaatjad odavamad kui mõned teised digitaalsed režiimid. Andmed sisalduvad ka teie kõneülekandes, mis sisaldab teie unikaalset ID-d, kellele ülekanne on mõeldud, ja mõnikord muid andmeid, nagu GPS-positsioon.
Saateid saab suunata kas rühmale või üksikisikutele. TDMA võimaldab 2 QSO-d samaaegselt.
Colour Code (Värvikood)
Värvikoodid on CTCSSi DMR-versioon. See ei ole värv kui selline, sest see on lihtsalt number 1-15, mille te programmeerimisel määrate.
Radio ID
Raadio ID on unikaalne 6-kohaline ID-number, mis on seotud teie kutsungiga. Enne DMR-i kasutamist peate taotlema ID-d. ID-de väljastamine toimub ühes kohas - radioid.net
Time Slot (Aegruum)
Aegruum on eespool nimetatud TDMA kasutamise tulemus. Kordusaatjad töötavad kasutades 2 ajasilueti, mille nimed on mugavalt Time slot 1 & 2.
Kordusvoojad lülituvad kiiresti ajavahemiku 1 ja 2 vahel. Teie raadio kuulab siis programmeeritud ajasilu.
A Radio ID is a unique number assigned to you (and your callsign) by the RadioID.net Team. Like a telephone number or IP address, your Radio ID identifies you as a unique radio user on the various DMR networks and repeaters around the world. Because DMR is digital, we have so much more that we can do with the RF flowing to and from our radios. For example, because of Radio IDs we can see and display the callsign of the person talking to us on the radio face by the use of the RadioID.net Database. Every time you PTT your DMR radio, your Radio ID gets transmitted to the DMR network and everyone can see who you are.
Pretty cool, right?
BUT DON’T FORGET.. YOU MUST STILL ID BY VOICE TO BE LEGAL! Even though your callsign shows up in the network logs and on other users radios does not mean you are identifying yourself a licensed ham. You must ID like you do on analog.
So why else is this so cool? Identifying every radio and repeater uniquely with an ID enables the very essence of DMR networking to function. i.e making private calls to each other, organizing specific talkgroups for countries, states, regions, cities, clubs, special interest groups etc.
In short, a Radio ID enables you to talk to and hear only the people and traffic that you want to.
It’s totally free to get your Radio ID and you NEED ONE if you are going to have a DMR radio and use it. Is it the law? No. But you aren’t going to enjoy using DMR unless you have one, so do yourself a favor and get registered with RadioID.net as soon as you buy a DMR Radio.
It’s easy to register with RadioID.net and get your own Radio ID. Just click the button below, read the entire page to understand what you are about to do, then click the USER REGISTRATION button at the bottom of the RadioID.net page.
The procedure looks something like this:
In order to complete the account registration and get an ID you must get the official TTJA document to up load to their site to complete the registration.
An original Government Document with your Callsign clearly visible. This is the only way to verify you are the License Holder. A ‘Screen shot’ of a webpage, or the ‘Reference Doc’ can be taken by anyone and are NOTacceptable.
Now that you have a unique Radio ID you are ready to use your radio on a DMR Network. There are several networks out there, but we are using two them on our repeaters. Brandmeister and ADN Systems network.
Brandmeister network is very large, with hundreds of repeaters networked together around the globe and thousands of users using them. ADN is a brand new network with growing up community around the globe.
We’ll go into much more depth discussing each of these networks separately on their own dedicated pages. There are many similarities between how the two function, but a few major differences as well.
A DMR talkgroup is simply a way of grouping many Radio IDs into a single digital contact. Or put another way, a talkgroup is a method of organizing radio traffic specific to the DMR users that all want to hear the same thing and not be bothered by other radio traffic on a DMR network that they are not interested in hearing.
Talkgroups can exist for many purposes. You can have talkgroups for countries, states, counties, regions, cities, special interest groups etc. Just about any group of DMR users could have a talkgroup assigned to them if they wished to organize traffic that they can all monitor and take part in, without having to talk to each other one by one.
Talkgroups are also specific to individual DMR networks, BUT they all generally follow the same numbering scheme. So you need to make sure that you know what the various talkgroups are for each of the DMR networks that you may use.
For example, Talkgroup 24804 on the ADN network might not be the same as Talkgroup 24804 on the Brandmeister network.
Be sure to manage your Talkgroups separately if you use more that one DMR network!