There are 3 DMR Roaming systems of which only two are currently functional:
- Motorola Roam
- Hytera Roam
- Brandmeister Roam (not yet functional)
The idea is that as you travel from one repeater’s coverage to another, much like cellphones do, the HT or Mobile radio will automatically change to the new repeater frequency and maintain the same Talk Group. N1ATP repeaters are a combination of Motorola and Hytera. The system is really cool. By programming a Motorola or Hytera HT or Mobile by Talk Group and a roam list the radio switches frequencies accordingly to maintain the talk group. Knut uses this method as he travels between his two repeater’s coverage.
In Connecticut, a statewide ARES system has been implemented with this capability. In theory, a user can simply turn on his Motorola or Hytera radio and select a Talk Group and the radio will automatically figure out which repeater to use.
Great Presentation on a Ham Event Utilizing ROAM
The YouTube video presents an event where balloon chasers are remaining on the same TG while automatically switching between 3 repeater-sites as they are chasing. All without touching the channel selector…..
The Video is from www.livefromthehamshack.tv
Create a channel with the correct CC, TS and TG for each repeater you will be traveling between. Make sure IP Connect is checked.
Create a ROAMing list.
Add the channel in the same way as a scan list, however as a TG specific roam list.
As you move and loose one repeater, the radio will switch to the next repeater in the roam list with adequate signal while your main on the same talk group.
The difference between scan and roam is that Scan keeps scanning until a signal is received, while a roam list checks in with the repeater and remains locked on that channel until the signal is too weak.
I have personally maintained the same QSO while traveling from SW CT up north through the state never really knowing which repeater I was on. Not totally true since the display will tell you. Point is, it is very much like a cellphone. It just works!