MotoTRBO System ID

[romanr]

A recent thread on Public Safety Pool ID requirements led me to read the Title 47 CFR part 90.425 rules on Station ID. This aroused my curiosity regarding how MotoTRBO (DMR) systems meet these rules (non Public Service Pool Systems).

As I read the rules, a DMR system must ID every 15 minutes (when active) in Analog mode via either a voice announcement or Morse Code (via audible tones). It seems that transmitting ID in digital mode would not fulfill the requirements, so do these systems change to Analog for their ID, or have I missed a part of the rules?

In simple terms, "how do MotoTRBO systems meet the ID requirements"?

 

[trumpetman]

Analog morse code. Same with most all other digital only stations. They can switch back temporarily to fire off a CWID and then go digital only until the next time to ID.

 

[romanr]

That makes sense is what I thought would be required. I assume that is pretty easy to accomplish with a repeater. If a system is just a base and a bunch of mobiles, I guess the base has to have an analog channel configured and switches to that channel for the ID before returning back to the digital channel. (are there any real-world DMR systems that don't have a repeater today?)

Thanks for answering my question.

 

[KA5YTH]

I had to turn off CWID. We were getting busy signals.

Sent from my SM-G900V using Tapatalk

 

[kh6sz]

So, could this CWID be used on Cap+ and Con+ systems to identify the network ID?

 

[trumpetman]

I had to turn off CWID. We were getting busy signals.

Sent from my SM-G900V using Tapatalk

That sounds like a programming error elsewhere, I wouldn't think that a CWID denies access...it doesn't on any other repeater I've used.

So, could this CWID be used on Cap+ and Con+ systems to identify the network ID?

The ID is only for the FCC call sign, it doesn't identify network or system ID.

 

[KA5YTH]

That may be. However, the dispatcher would key up calling a unit. The repeater would CWID and the answering unit would get a busy. Turned off CWID and the busy's went away.

Sent from my SM-G900V using Tapatalk

 

[WA0CBW]

That is the way MotoTrbo works. It identifies in analog on the same frequency. So when it is identifying it can't receive or transmit digital. Set the ID speed to the maximum to reduce the busy time.
BB

 

[romanr]

Do the MotoTRBO repeaters have the ability to store the CWID and transmit it periodically (in Analog) automatically, or is this handled by the dispatch controller (if there is such a thing with MotoTRBO)?

 

[WA0CBW]

The ID and ID interval is programmed into the repeater and it identifies in an analog mode at the prescribed time.
BB

 

[cmdrwill]

There is a setting in other Motorola base/repeater stations for Polite or something like that so the ID will be suspended if there is traffic on the repeater. It will even interrupt the ID if a user keys.

on Public Safety Pool ID requirements the interval is 30 minutes.

 

[JRayfield]

Yes, but if a MOTOTRBO repeater has been 'idle' for over 30 minutes (or whatever the ID period is programmed for), then someone keys up the repeater, as soon as that person releases PTT (transmit), the repeater will ID. That creates a 'busy' for a person who is responding to that first 'keyup'. On an analog-only repeater, a person can 'key up' on top of the CW ID and it will interrupt the CW ID, so no problem. But once the MOTOTRBO repeater is transmitting in analog mode, there is no way to 'interrupt' the repeater until it finishes the CW ID and switches back to digital mode (or mixed mode).

John Rayfield, Jr.
W0PM

There is a setting in other Motorola base/repeater stations for Polite or something like that so the ID will be suspended if there is traffic on the repeater. It will even interrupt the ID if a user keys.

on Public Safety Pool ID requirements the interval is 30 minutes.

 

[N4DES]

Yes, but if a MOTOTRBO repeater has been 'idle' for over 30 minutes (or whatever the ID period is programmed for), then someone keys up the repeater, as soon as that person releases PTT (transmit), the repeater will ID. That creates a 'busy' for a person who is responding to that first 'keyup'. On an analog-only repeater, a person can 'key up' on top of the CW ID and it will interrupt the CW ID, so no problem. But once the MOTOTRBO repeater is transmitting in analog mode, there is no way to 'interrupt' the repeater until it finishes the CW ID and switches back to digital mode (or mixed mode).

John Rayfield, Jr.
W0PM

To concur with the above, that is exactly the way that my Trbo repeater works that is connected to the MARC system. Even on local mode if I put a my call out the next PTT is blocked until the CWID is complete. Took a little bit for some of my local users, including myself, to get used to. My conventional P25 repeater does not act this way.

As a general response, in the Public Safety rules though there are "other forms" of acceptable station identification and is not limited to CWID only by the FB2.