Moto TRS with constant key-ups

N9JIG · Dec 15, 2017

In my area the county has a P-16 Motorola trunked system with multiple sites. One of the sites near me has on at least 2 of the voice channels constant, regular key-ups every 60 seconds for a second or so, much like an LTR system.

I do hear the normal analog and P25 voice operations on the freqs when the channels come up in rotation. The control channel, these key-ups and the normal voice ops are all the exact same signal strength.

Has anyone seen a Moto trunked system behave this way?

nd5y · Dec 15, 2017

Run Unitrunker or Pro96com on it and see what the control channel is sending when the keyups happen.

troymail · Dec 15, 2017

Maybe not the same thing and not on a Moto P16 system but I used to see a talkgroup (or maybe a private call?) pop up on regular (1 minute?) intervals on a multi-site 380 Mhz P25 system... I never did figure out what it was - but it seemed like either some type of monitor for something (i.e. - listening for an audible alarm in the area of the transmitter, etc.) or some type of "keep alive" function for something? Of course, I'm only speculating...

crazyboy · Dec 15, 2017

Is it on a particular talkgroup?

kb5udf · Dec 15, 2017

Same thing here

Im my area there is a utility, CLECO, who's 900mhz analog TRS does the same thing. Seems
to key up a voice channel with no traffic. I don't recall unitrunker showing anything. I'll check again.

mikewazowski · Dec 15, 2017

N9JIG said:
Has anyone seen a Moto trunked system behave this way?

It's normal behaviour. The keyups allow the controller to measure things like transmitter power and vswr. If a failure is detected, the repeater can be taken out of service.

N9JIG · Dec 15, 2017

MikeOxlong said:
It's normal behaviour. The keyups allow the controller to measure things like transmitter power and vswr. If a failure is detected, the repeater can be taken out of service.

Wow, thanks Mike.

In 30 years of listening to Moto systems I have never heard this before.

Do all P16 systems do that or is it just some?

trumpetman · Dec 15, 2017

We always called it a TSTAT, not sure what the actual functional name was. It's done on all Motorola Type II systems for repeater status reading like Mike said.

ecps92 · Dec 15, 2017

RSTAT and TSTAT
Receiver Status and Transmitter Status [had to google it]

trumpetman said:
We always called it a TSTAT, not sure what the actual functional name was. It's done on all Motorola Type II systems for repeater status reading like Mike said.

slicerwizard · Dec 16, 2017

N9JIG said:
Wow, thanks Mike.

In 30 years of listening to Moto systems I have never heard this before.

Do all P16 systems do that or is it just some?

The Ontario-wide Fleetnet system seems to do it on all of the traffic channels. Wouldn't be surprised if it was a option in the system's settings.

Moto TRS with constant key-ups

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