[TrunkCom] LTR trunked system with a channel carrier constantly going with data?

[Jeff Kenyon]

Hi everyone, I just came across an LTR trunking system in the VHF range in my area in New York, and from what it appears it seems to belong to an SMR owner, and has many sites, all of which are VHF.  The thing I've noticed about it all is that since I moved her last August there has been a channel that is transmitting all the time, and just a carrier, and I can hear the slight rumble of data in the background.  Does anyone know of other LTR systems where a channel is constantly active?  I know that in some LTR systems the data channel will carry the voice traffic when needed, and the slight data burst, but nothing like this.
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