Help, Unknown Trunking Format

[Herm]

I am trying to figure out what type of trunking system this is, here is the FCC info http://dettifoss.fcc.gov/acweb/dettifoss/Genmen_a/db_19/d_admin_l_lm.roi;1332?ViewDefault

I have checked the frequencies for CTCSS and DCS tones and come up with nothing. On 458.1625mhz the FCC says it is a control channel the only sound comming from it is a constant high pitch tone. When there is a transmission on that frequency the tone stops and when the transmission ends it picks up again.
Any help woulg be welcomed.
Thanks,
Herman

 

[DaveH]

It may not be trunking. Some point-point links use a constant idle tone for some reason, probably to monitor condition of the link.

It might be a combined voice/data channel. Is the tone always constant or can you hear bursts of data i.e. MDT ?

One other possible thing I can think of... iare these actually EDACS control channels?
It wouldn't sound like a pure tone though...a jangling sort of sound. If so, these could be SCATs (single-channel EDACS sites).

Dave

 

[mikey60]

On 458.1625mhz the FCC says it is a control channel the only sound comming from it is a constant high pitch tone.

This would be an input frequency to the 453.1625 repeater frequency. What are you hearing on the 453/460 frequencies?

Mike

 

[FPO703]

It's probably an RF (Transmitter) Link. Basically a poor man's link from base to transmitter.

 

[Herm]

Does it have to be a trunked system in the FCC Radio service code is YW-Public Safety Pool Trunked?

 

[Herm]

On 453.1375mhz I am getting a burp, burp sound. I cant tell if there is anykind of a patternwith the noice I am hearing.
I wish I could figure this one out.
Herman

 

[Herm]

LTR System

After entering 458.1625 into my BC780 20 times in bank #1 and setting it to LTR it came up with these talkgroups:
1-15-191
1-15-052
Can anyone tell me if these are vailed talkgroups, and if so why am I not getting anything on any of the other frequencies.
Thanks,
Herman

 

[DaveH]

Those Group IDs fall within the valid range, however, I'd do a CTCSS/DCS search if you haven't already. Certain DCS codes have been reported to confuse LTR radios, so it might be that. This was discovered when conventional and LTR were mixed, on the same frequency.

Dave

 

[loumaag]

Re: LTR System

After entering 458.1625 into my BC780 20 times in bank #1 and setting it to LTR it came up with these talkgroups:
1-15-191
1-15-052
Can anyone tell me if these are vailed talkgroups, and if so why am I not getting anything on any of the other frequencies.
Thanks,
Herman

Hmm, I am a little confused. Earlier in the thread, you said the FCC data indicated this was a control channel, I didn't think the FCC knew (or cared) about control channels. Just so we can all get on the same page here, are you talking about license WPRV993? If so, I would recommend that you start plugging in the repeater output frequencies (the 453 range) and see what you get there. Listening to inputs are not going to get a lot of answers about a new system. The burp-burp you mentioned could indeed be indicative of a regular LTR system. Outputs are keyed every 10 seconds on home repeaters.

Keep us up to date on what you can discover. :wink: