DMR trunk systems?

[NS9710]

I’m looking at stuff like DMRVA amateur radio and other stuff showing DMR as a trunk system, are these actually trunked systems or can I monitor this stuff as receive only without worrying about my DMR radio getting bricked as I’m not actually a member of any user agencies?

 

[JohnnyGent]

apologies for not being knowledgeable about your system, but could't they only brick if transmitted on? I listen to https://www.radioreference.com/apps/db/?sid=9506 with person to person calls, and everything with my 436 which obviously can't transmit. one of a few I listen to. If that was not helpful, someone smarter will answer : )
Scan On.

 

[NS9710]

I have a DMR radio not a scanner thus why I was asking.

apologies for not being knowledgeable about your system, but could't they only brick if transmitted on? I listen to https://www.radioreference.com/apps/db/?sid=9506 with person to person calls, and everything with my 436 which obviously can't transmit. one of a few I listen to. If that was not helpful, someone smarter will answer : )
Scan On.

 

[clbsquared]

In short, If the system doesn’t recognize the radio, ( improper RAS) it doesn’t allow access. Since scanners can’t transmit, it ignores the request. That answer might be a little broad, and I’m sure someone can go in depth a little further. But, DMR trunking is a bit more difficult to “monitor only” with a Motorola transceiver than a P25 system or analog system. Other brands of radios may ignore the RAS and allow the radio to unmute.


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[Ghstwolf62]

Everything I've read is that you can monitor these systems as conventional channels. Program each voice channel into the radio as conventional. I do it and it works fine.

Also DMRVA is the interconnected amateur radio system in Va. Its not trunked and its not a commercial or public safety system. Like anything else if you're not authorized don't transmit. Most all DMR radios as far as I know have transmit inhibit check boxes or they may be marked receive only. Check it. IF your CPS doesn't have such then set the transmit freq somewhere far away like 400.00 mhz or 140.00 mhz in case you hit the transmit button you won't be actually transmitting on somewhere you're not supposed to.

I have a great deal of PS freqs in my radios and all are marked as I stated. Keying the mic gets me a loud obnoxious tone and a message saying receive only. It doesn't transmit no matter what.

 

[N4VKF]

I’m looking at stuff like DMRVA amateur radio and other stuff showing DMR as a trunk system, are these actually trunked systems or can I monitor this stuff as receive only without worrying about my DMR radio getting bricked as I’m not actually a member of any user agencies?

No not trunking. Dmr phase 2 stand alone repeaters. Trunking not allowed in ham radio

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[slicerwizard]

can I monitor this stuff as receive only without worrying about my DMR radio getting bricked

I doubt you've programmed your DMR radio to respond to any stun/inhibit requests.

Since scanners can’t transmit, it ignores the request.

What request?

 

[fredva]

The DMRVA network does have talkgroups, although it uses conventional frequencies. The talkgroups may have led to the belief that it is a trunked system. And the repeaters are networked in such a way that somebody talking near Charlottesville can be heard off the Fredericksburg repeater. I would not consider myself an expert on the network though - just occasionally monitor it.

 

[clbsquared]

I doubt you've programmed your DMR radio to respond to any stun/inhibit requests.


What request?

Verification of RAS in trunking systems.


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[kayn1n32008]

IF your CPS doesn't have such then set the transmit freq somewhere far away like 400.00 mhz or 140.00 mhz in case you hit the transmit button you won't be actually transmitting on somewhere you're not supposed to.

No need to program a transmit frequency. Any LMR radio I have ever used, if you do not program a transmit frequency, the radio will not transmit. If you set a transmit frequency, and have a button programmed for ‘talk around’ the radio WILL transmit on the receive frequency when put into talk around mode.

No not trunking. Dmr phase 2 stand alone repeaters. Trunking not allowed in ham radio

Hmmm, can you cite a rule or regulation saying trunking is not allowed on ham radio?

I know of a ham DMR system using LCP.

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[NS9710]

I do in fact have all my frequencies set as RX Only.

 

[Ghstwolf62]

No need to program a transmit frequency. Any LMR radio I have ever used, if you do not program a transmit frequency, the radio will not transmit. If you set a transmit frequency, and have a button programmed for ‘talk around’ the radio WILL transmit on the receive frequency when put into talk around mode.

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I didn't know that. I'm not overly fond of regular amateur radio equipment due to their utter lack of things I want in a radio, TA at the push of a button being one of them. All the commercial or near commercial stuff I own has TI or RX only options in the CPS. The amateur stuff does not. So on my Yaesu 8800s the default freq on UHF is 400.00mhz. To avoid transmitting where you're not supposed to you leave it or put something far away from the transmit freq in if you want to safely have PS for instance in your radio and not get in trouble

That's what I was referring to. I can say on my stuff if you hit TI or RX Only it won't allow you to use TA or transmit under any circumstances on that channel. Just checked on the radio here and tried to put it in TA mode on a local PS freq. Wouldn't accept it. Plus you have to enable TA in the CPS for the freq on the stuff I have too. Not enabled and you can't enter simplex mode at all.

 

[Ghstwolf62]

The DMRVA network does have talkgroups, although it uses conventional frequencies. The talkgroups may have led to the belief that it is a trunked system. And the repeaters are networked in such a way that somebody talking near Charlottesville can be heard off the Fredericksburg repeater. I would not consider myself an expert on the network though - just occasionally monitor it.

I think the misunderstanding here is that for some reason RR lists DMRVA as a "Trunked Radio System"

I've seen it under county listings before although I can't seem to find it today when I'm looking for it. I did find it here though with the title shown.

Scroll to bottom.

All Amateur Radio Trunked Radio Systems in Virginia
https://www.radioreference.com/apps/db/?stid=51&tab=ham

 

[Ghstwolf62]

I do in fact have all my frequencies set as RX Only.

You're good to go then.

 

[kc4jgc]

As pointed out, this is NOT a trunked system, but rather linked (networked) repeaters with multiple shared talk groups. I'm fairly new to the DMR scene myself. As far as monitoring your radio is likely to be quiet for extended periods. On the DMRVA network, only two talk groups, one on each time slot, is on full time. The others are PTT activated, which means a local user has to key up for the TG to become active on that particular repeater (assuming, of course, no other TG's are active on the time slot). On our code plugs we have a "Monitor All" TG, which really isn't a TG but allows the radio to scan through the TG's on a repeater.

A safeguard to keep unlicensed users from accessing the system is the use of radio ID's. One must have a valid amateur call and must register in order to access the network.

 

[n4jri]

All correct. On a scanner, you can program it as a trunk simply to allow a number of different frequencies to all share the same set of talkgroups. This is how things work anyway on the Whistler scanners, which don't truly trunk-track DMR anyway. I program each network as a system, and will hear traffic on whatever frequencies I'm in range of.

73/Allen (N4JRI)