State/Regional P25 Trunked Systems

[ofd8001]

This is one for the "High Tech" folks familiar with programming of radios on wide area P25 trunked systems:

My radio is programmed to have the "Out of Range" alert tone to sound if I am out of range. This would happen if I'm in a dead spot such as in a basement, etc.

If I roam into another county that has a different site, my radio will continue to "sense" that I'm receiving a valid control channel. However, the talkgroup I have my radio selected to is not allowed to affiliate with that different site. (I can select other talkgroups that are permitted to affiliate with the site).

What happens if I try to key up my radio? Do it get the "bonk" tone as if there were no available voice channels, or would I hear the Out of Range tone?

(Yeah I know I could try it, but the computer is a lot closer than that other site right now.)

 

[slicerwizard]

I would expect a bonk because the system will send a rejection message.

 

[MTS2000des]

If the system is a Motorola Astro 25 network, the subscriber will just bonk upon PTT attempts. Looking at Zone Watch/GenWatch, one will see "affiliation denied" next to the scroll of ATIA data if a user tries to generate a PTT request on a talkgroup that isn't wide area, or foreign group (ISSI) not allowed to register on the foreign system. Kind of a pisser, because the user's radio (depending on programming, specifically site preference) will show signal "bars" but won't unmute or let them talk. User training is key for any system, but especially large ones with multiple zones and talk groups being provisioned local or wide area.