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LTR Systems - Noticed more direct operations

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Steveradio

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Noticed up here in PA that mostly the indoor LTR systems such as casinos, parks that use them also utilize alot of T/A channels as well not licensed. Does anybody else run into this?
 

tunnelmot

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Conroe, TX
I know this a late reply, but...
Yes. Here in the Houston metro area, 490 Mhz LTR systems are very prolific. As a former user of many of those systems, I personally used T/A a lot. It was almost standard programming for some shops. I did find the frequencies for what I was using at the time, and no, they weren't published/listed/licensed. I do believe some shops just picked random frequencies from what I could tell. Seeing as how we rented repeater air time, they were smart(marketing wise) to limit power output to the lowest levels the Kenwoods could do.
 

natedawg1604

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In the Denver-Metro area I've found several LTR systems with one or more "unlicensed" frequencies as well. Sometimes it's very hard to tell if a particular system/site actually correlates with known FCC licenses. In some cases it appears that people borrow/lease/buy/trade frequencies from several licensees' and combine them into one system without updating ULS.

AFAIK in Colorado nobody uses the UHF T-band for LMR; so far I've not found one single voice frequency in that band (although I don't search it very often because it's so dead).
 

brian209

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South Windsor, CT
I know this a late reply, but...
Yes. Here in the Houston metro area, 490 Mhz LTR systems are very prolific. As a former user of many of those systems, I personally used T/A a lot. It was almost standard programming for some shops. I did find the frequencies for what I was using at the time, and no, they weren't published/listed/licensed. I do believe some shops just picked random frequencies from what I could tell. Seeing as how we rented repeater air time, they were smart(marketing wise) to limit power output to the lowest levels the Kenwoods could do.
I have question on this 'direct' use of LTR and how that works. From what I'm gathering from this discussion the radio gets programmed with the LTR repeater list, and then programmed with Talk Groups that the radio can use, and then the shop includes a Channel labeled "Direct" and puts a frequency and PL on Low Power. And in this case the frequency labeled "Direct" would be unrelated to the LTR system.

Do I have that right?

I'm used to the convention definition of TalkAround where you press a button on the radio to put it in T/A and the radio then transmits on the Receive frequency so that local radios can pick up the transmission even if you are having trouble hitting the repeater. But, I do not see how that would ever work on LTR since it is dependent on the control channel to direct the other radios.

Brian
 

ramal121

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Most, not all, LTR radios will allow talk around. A separate group is made with the same ID as the one you would access the system with and then check a box labeled "TA". This would cause the radio to transmit on the home channel output only (TA does not trunk). The LTR data will set a flag indicating TA, but contain the rest of the good stuff including the correct GID so that all the other radios in that group will receive the transmission because they are sitting on the home channel already if the system is idle. Obviously if the system is in use and you try TA there may be problems, but generally works well.

If someone puts a conventional channel with a tone on a home channel that kind of defeats the purpose of talk around and is not the most neighborly thing to do.
 
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