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W2LIE.net | Monitor Long Island, Inc. :: Forums :: Scanner Radio :: Long Island - General
Moderators: w2lie, Chieftaz, BobLandau, quint14, LI_Scan_Guy, cwerner

220mhz trunked

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Print View Posted: Thu Mar 28 2019, 11:23pm
Posted by: Darkstar350Posts: 617
Joined: Mon Aug 18 2014, 10:57pm

Just wondering if anyone has got activity in the 200mhz band
I know on 220mhz is some ham clubs and around 280/290mhz is govt. but there are some other commercial users of 220mhz
From what i gather 220mhz trunk systems would be mostly LTR/Passport such as a particular passport system comes to mind which was meant to be used by ships but im not sure if thats active anymore

I found a few 220mhz trunk licenses - 2 in suffolk and 2 in NYC -
[link]
[link]
[link]
[link]

Ive been scanning around 217-220mhz and havent heard anything yet but i also recall hearing something like 220mhz radios use a very wide bandwidth and scanners may not be able to receive it properly...




[ Edited Thu Mar 28 2019, 11:33pm ]


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Posted: Fri Mar 29 2019, 04:27am

Posted by: PFD MikePosts: 392
Old Display Name: PFD Mike
Donating Member - 2008-2010
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Joined: Wed Aug 02 2006, 12:31am

There was a radio service either just above or below the ham 220 band. It used some weird modulation scheme it was a side band with some sort of compression, if I remember correctly. I'm not sure if it was trunked.
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Posted: Fri Mar 29 2019, 03:02pm
Posted by: Darkstar350Posts: 617
Joined: Mon Aug 18 2014, 10:57pm

PFD Mike wrote ...

There was a radio service either just above or below the ham 220 band. It used some weird modulation scheme it was a side band with some sort of compression, if I remember correctly. I'm not sure if it was trunked.


You may be thinking of the same passport coastal system i was thinking of "Mobex" which is actually 217mhz
According to the RRDB is inactive [link] but the FCC license is still active [link]
Did you ever hear activity on there?

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Posted: Tue Apr 02 2019, 02:40am

Posted by: PFD MikePosts: 392
Old Display Name: PFD Mike
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Joined: Wed Aug 02 2006, 12:31am

This is what I was thinking of - SEA ESP-520 ACSB mobile transceiver used Amplitude Compandored SSB modulation on 220-222 MHz. Some people modified these for Amateur 220 use, but they said it was very labor intensive getting them aligned.
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Posted: Tue Apr 02 2019, 09:40pm
Posted by: Darkstar350Posts: 617
Joined: Mon Aug 18 2014, 10:57pm

But basically no scanner would be able to pick up such modulation ?
I have been scanning around 217-221mhz and havent heard much except some data noises and some ham repeaters
Some type of data that is used by railroads is also found around 218mhz

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Posted: Thu Apr 04 2019, 11:46am

Posted by: w2liePosts: 2763

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I thought UPS took some of the Amateur Radio band in the 220 range.
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Posted: Thu Apr 25 2019, 01:00pm
Posted by: Darkstar350Posts: 617
Joined: Mon Aug 18 2014, 10:57pm

Been checking around this band
Most of its dead however -
Im getting possible LTR-type bursts on 220.3175 and 220.4675

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