220mhz trunking

[191145]

what systems operate at 220mhz/trunking - in use by commercial entities?

Thanks,

JP

[gewecke]

I think FED EX tried this awhile back but it ended up being a big flop for them,and we never did get that part of the band back again! Oh Well...
N9ZAS

[nd5y]

It might be ACSSB with MPT-1327 or Passport LTR as discussed here: Non-Nationwide 5 Channel Trunked, 220 MHz system
Here is a company that makes narrowband digital data radios for 220 MHz CX2 Technologies, Inc.
Here is an article about commercial use of the 220 MHz band http://220.mrtmag.com/ar/radio_why_mhz/index.htm

[fineshot1]

There is the one in nj here operated by the nj highway authority. Its in the 216-217/218-219mhz band and is ltr passport narrow band fm - see links below

Any updates on the New Highway Authority System

GS Parkway Radio System

[BC_Scan]

2 systems (MPT) running here one in BC & Washington state , from my understanding MPT1327 is the flavour for these systems , run by a private company from my recollection.

[MtnBiker2005]

Southern California

Touch Tel Mobile (217 MHz LTR #1)
Site License(s): WHG660
http://www.radioreference.com/apps/db/?sid=6072

Touch Tel Mobile (217 MHz LTR #2)
Site License(s): WHG660
http://www.radioreference.com/apps/db/?sid=6073

[191145]

I'm trying to monitor a local (south Louisiana) electric company that the FCC lists as: Non-Nationwide 5 Channel Trunked, 220 MHz. FCC shows ~10 freq's assigned per license.

It sounds like LTR as I get 2 or 3 units (including base) comms (searching) on freq's between those listed, the carrier remains between different units and remains afterwords for several seconds until ended by a data burst. They also always come with a CTCSS. I tried monitoring as LTR with no success.

I can listen successfully by using the search hit freqs as conv with sq search.

Just trying to understand this stuff...

Thanks for your thoughts & help,

JP

[nd5y]

Originally Posted by 191145

I'm trying to monitor a local (south Louisiana) electric company that the FCC lists as: Non-Nationwide 5 Channel Trunked, 220 MHz. FCC shows ~10 freq's assigned per license.

It sounds like LTR as I get 2 or 3 units (including base) comms (searching) on freq's between those listed, the carrier remains between different units and remains afterwords for several seconds until ended by a data burst. They also always come with a CTCSS. I tried monitoring as LTR with no success.

I can listen successfully by using the search hit freqs as conv with sq search.

Just trying to understand this stuff...

Thanks for your thoughts & help,

JP

If you are hearing a several seconds hang time on the voice channels with a data burst at the end it is MPT-1327. There is no CTCSS on LTR systems.

[eraweeb]

No offense intended, but I'm just curious about something...

What do you get out of monitoring an electric company?

[191145]

no offense taken - it's a legitimate curiosity -

mostly emergency preparedness - the power goes out here regularly, it was out 5 to 10 days during gustov, last year. We were out 8 1/2 days in town.

monitoring helps to determine when to hook up the generator & how much fuel to buy (how long to run the thing till power is reconnected). During gustov, under generator power, my electric bill (gasoline) was close to $100/day...

I'm just entering the 2 freq's they seem to use here as conv & have a search over the entire range they're FCC licensed for - can pretty much hear everything. The CTCSS is inconsistent.

JP

[AlabamaRS]

Originally Posted by 191145

I'm trying to monitor a local (south Louisiana) electric company that the FCC lists as: Non-Nationwide 5 Channel Trunked, 220 MHz. FCC shows ~10 freq's assigned per license.

It sounds like LTR as I get 2 or 3 units (including base) comms (searching) on freq's between those listed, the carrier remains between different units and remains afterwords for several seconds until ended by a data burst. They also always come with a CTCSS. I tried monitoring as LTR with no success.

I can listen successfully by using the search hit freqs as conv with sq search.

Just trying to understand this stuff...

Thanks for your thoughts & help,

JP

is it's trunking they do not use PL tones??

[jsharp2316]

Dixie Electric (alias DEMCO) operates a five site 5-channel MPT-1327 trunking system using Simoco mobiles and portables and DX Radio Base stations (read that Eclispe from RTF in Australia) with Fylde Micro controllers and infrastructure. They operate on 12.5 Kz channel centers. Dixie had a very extensive Linear Modulation system (read that Securicor ACSB) system but I don't know how much of it is still running (probably none). There were a couple of SEA ACSB systems operating around southern LA but I don't know who actually had them-----they would be ACSB using LTR.

Motorola offers 220 MHz 12.5 KHz only with Passport, Team Simoco UK offers 220 MHz 12.5 & <10 Khz with 1RU 100 watt bases & Simoco Australia (who they just bought) SRM9030, and several mobile versions & two portables. Several "best -of-breed" suppliers sell Simoco mobiles, RTF bases and Flyde controllers including DX Radio Systems, NIC in Valpariso, IN, a Fylde dealer in NC, and a south american dealer in Miami. Cornerstone SMR still handles "surplus" SEA stuff and has probably 15-20 sites nation-wide with SEA ACSB LTR. The conventional FM above is understandable on a scanner but ACSB is like Donald Duck over the air. Simoco and Fylde have added using CTCSS optionally on MPT-1327 becasue there were a couple of problems with muting when operated in the USA.

[191145]

Great! info - Thanks

JP