200MhZ LTR system

[PhillyPhoto]

Does anyone have info on this system in the DelCo area? I know there's on listed in Philly, but it's a MPT-1327 system. I'd like to listen to it because the company I used to work for is on it. It should be through a communications company that leases talkgroups on it, but I forget what the name of the company is.

 

[EricCottrell]

Hello,

Is it sites 20 and 21 of this system?
http://www.radioreference.com/apps/db/?sid=3185

73 Eric

 

[PhillyPhoto]

No, it didn't have to do with maritime operations. It was a fuel company located at the airport.

 

[EricCottrell]

No, it didn't have to do with maritime operations. It was a fuel company located at the airport.

Hello,

Although the band was originally for Maritime Operations, the FCC allows Land Mobile. One of the New York sites has a Land Taxi company on it. The majority of users on this system are Land Mobile.

Motorola HT1250LS+ portable or CDM1550LS+ mobile are common radios used. They will do Regular LTR/Passport and comes in a 200 MHz version that covers 216 to 222 MHz.

73 Eric

 

[PhillyPhoto]

OK, I'll have to throw it in my scanner and see what I hear. I guess I'll have to enter them regularly since it's Passport. The company I worked for had CDM1250s and a couple HT1250s.

 

[fineshot1]

Hello,

Is it sites 20 and 21 of this system?
http://www.radioreference.com/apps/db/?sid=3185

73 Eric

Maybe I missed somthing but why can I NOT find these TRS freq assignments listed in the FCC DB?

 

[EricCottrell]

Maybe I missed somthing but why can I NOT find these TRS freq assignments listed in the FCC DB?

Hello,

Because the 217 MHz frequencies were auctioned off with two systems per market area.

73 Eric

 

[JRM5204]

I live by the airport and get close call hits in the 200mhz range alot what sounds like a airport shuttle etc. I will see what I can come up with frequency wise.

 

[fineshot1]

Hello,

Because the 217 MHz frequencies were auctioned off with two systems per market area.

73 Eric

Shucks - I was hoping you were not going to say that. I was always under the impression that these 220mhz TRS's were ACSB and not FM. Does anyone have insight into this?

 

[transitman]

Dollar Rent A Car uses a 220 Mhz system at PHL.

 

[EricCottrell]

Shucks - I was hoping you were not going to say that. I was always under the impression that these 220mhz TRS's were ACSB and not FM. Does anyone have insight into this?

Hello,

Here is the Boston Area we have both ACSB and FM systems. The trend seems to be to take the 5 adjacent ACSB channels and make 2 NBFM channels out of them. The FM frequencies are spaced at 12.5 KHz with a 6.25 KHz offset. For a sample frequency layout see:
http://www.radioreference.com/apps/db/?sid=3872
You will notice 220.88125 is used instead of 220.875 due to the 6.25 KHz offset. You will also notice that AMTS frequencies of 217.050 and 217.100 are also used on this system.

If you have a radio that can tune with 6.25 KHz steps then search the 217 and 220 frequencies for LTR Idle Bursts and FM. The ACSB control channel will be continuous data. ACSB voice sounds like analog encryption (garbled) on a FM Receiver. If you hear a keyup every 2 to 5 seconds it is likely a Passport system.

217 and 220 MHz seems like a "hidden" band for FM. Both the 2004 Democratic and 2004 Republican conventions used 217/220 MHz Passport systems. A temporary site on 217 MHz was used for the Fleet Center.
http://www.accessspectrum.com/xpwreport/xpw7.html

73 Eric

 

[fineshot1]

Thanks Eric - good info. I do not have anything that will do 6.25khz steps but perhaps 12.5khz is more do-able.