SI Group - System Type?

Alright I do not have much experience with Trunked and Digital systems, so this is a learning experience for me.

SI Group is an industrial facility nearby me. I have found a listing of their FCC licensed freqs:

451.2875
451.3875
451.5375
452.625
456.2875
456.5375
457.625
463.7375
462.8125
464.6625

I have heard voice communications on at least 1 of the Freqs listen above and also have heard a noise on 463.8125 that sounds like a control channel. I recorded a brief clip of it: https://soundcloud.com/alex-kaczor-1/4638125a

Can anyone identify what type of system this is?

That sound clip definitely seems like it is NXDN or "Nexedge" which is a digital voice format
used in Kenwood radios and it probobly is that "SI Group" facility near you because they are licensed
for digital voice

ULS License - Industrial/Business Pool, Conventional License - WQNT784 - SI GROUP - Frequencies Summary

The thing is that freq(463.8125) looks like its only licensed for a 4 watt mobile radio which would be
difficult to recive beyond the work site itself but i suppose if you are close enough its possible...

See what you hear on 452.625 - because that seems to be a 40 watt repeater at the site

Very very quiet recording, can't personally make that out.

However, the 7K60FXE emission on that license is the emission designator typically used for DMR (MotoTRBO). May be a Connect Plus system.

Alright, Sorry for the low volume on the recording. I am close enough that I would be able to hear a 4 watt portable with no problems as I am less than a mile from their facility. I will be able to spend some more time monitoring them in a few days.

KD2DLL said:

451.2875
451.3875
451.5375
452.625
456.2875
456.5375
457.625
463.7375
462.8125
464.6625

Click to expand...

You can safely ignore the 456 & 457 MHz frequencies. They are the inputs to the repeaters on 451 and 452.

The three higher frequencies without any corresponding +5 licenses would be simplex.

DaveNF2G said:

You can safely ignore the 456 & 457 MHz frequencies. They are the inputs to the repeaters on 451 and 452.

The three higher frequencies without any corresponding +5 licenses would be simplex.

Click to expand...

Thats what I figured. I am planning to setup one of my scanners and do some logging/recording of the freqs I have and try to figure out some more based on those results.

So the 463.8125 is an Icon IDAS channel. I have been able to decode it on DSD+ Picked up The following so far: TG 1-104 and 1-120 RID: 1-397, 1-391, 1-166

You have snagged a piece of the Adirondack 2-Way IDAS system. I'll give you a leg up with the rest of that site's info:

WQMM-204 Willard Mountain (Site 12)

Ch 11 462.1625
Ch 12 463.8125
Ch 13 452.8000
Ch 14 464.9250
Ch 15 451.9875

1-120 is a taxi company

I haven't seen the others you posted yet.

Thanks Dave. Very weird, since SI has a liscense for that frequency as well. I did hear some voice activity that sure sounded like their day to day operations. https://www.radioreference.com/apps/db/?frn=0017004383