In Unitrunker sometimes I see a Radio Check message being sent to certain radios; sometime the radio responds and sometimes not. In the P25 Protocol, what exactly triggers this Radio Check message from the system controller? Also when the radio responds with an "ack" message, what exactly is the radio acknowledging?
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Question re: Radio Check TSBK
- Thread starter natedawg1604
- Start date
It's a check (Group Affiliation Query, technically) to see if a subscriber is still affiliated with X talkgroup at Y site. Motorola ASTRO 25 systems send the queries out 12* hours after the subscriber's last activity, and they will only be sent out if the subscriber did not de-register. The "Ack" message you see in Unitrunker is the subscriber acknowledging the query.
So in plain English, the system is checking to see if the radio is still out there. Every time there is some activity from the radio (keying up, data calls, changing talkgroups, roaming between sites) that clock is reset. If the radio properly de-registers, the clock stops. That doesn't always happen, though, and so a radio may go out of range then be powered down so it wouldn't have de-registered. Or a battery is pulled off a portable before powering it down. Or a mobile is installed in such a way that turning off the ignition switch abruptly cuts power to the radio. Etc.
* 12 hours is the default duration, but that can be changed if desired
So in plain English, the system is checking to see if the radio is still out there. Every time there is some activity from the radio (keying up, data calls, changing talkgroups, roaming between sites) that clock is reset. If the radio properly de-registers, the clock stops. That doesn't always happen, though, and so a radio may go out of range then be powered down so it wouldn't have de-registered. Or a battery is pulled off a portable before powering it down. Or a mobile is installed in such a way that turning off the ignition switch abruptly cuts power to the radio. Etc.
* 12 hours is the default duration, but that can be changed if desired
So what happens if there is no response? Does the system controller do anything?
Yes, it will drop that subscriber from the active list. The purpose of this is to maintain efficiency. For example if there was one remaining subscriber affiliated with TG 100 at Site 2, and that subscriber doesn't acknowledge the affiliation query, the system will stop carrying TG 100 at Site 2.
