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  1. #1
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    Default Keolis Commuter Services

    Locked on some RR channels and found this tones yesterday just outside Boston.

    160.320 dispatcher 77.0 Trains 146.2
    160.410 77.0/146.2
    160.590 77.0/146.2
    Dan Mathews
    Captain Natick Fire Station 2
    Assistant Fire Chief Lebanon ME.

    Metro Radio System
    Merrimack Valley
    Middlesex Radio
    Southern Maine Fire Notification
    WQUC779/KAE6915
    ^~--- 86---~^

  2. #2
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    I'm thinking only the MBTA radios will be transmitting the 146.2 Hz. It would be quite a chore for Amtrak, the freight railroads, contractors, etc. to keep track of which radios have been programmed to transmit the proper tone or not. And the 77.0 Hz is only used to mute the squelch on other remote base stations to eliminate feedback in the dispach office.
    Jacob
    KB1VLA

  3. #3
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    Quote Originally Posted by LTE4NFD View Post
    Locked on some RR channels and found this tones yesterday just outside Boston.

    160.320 dispatcher 77.0 Trains 146.2
    160.410 77.0/146.2
    160.590 77.0/146.2
    Dan: Just noticed your signature: tip of the hat. 18.

  4. #4
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    The 146.2 tone is only for satellite receivers along the railroad and the 77.0 is the tone knockdown for the base sites. The tone knockdown prevents howling and squealing back at the dispatchers console when adjacent base sites are used. The 146.2 is not used to open receivers on any mobiles or portables on the railroad, just like the tone knockdown. So you having it programmed in your scanner really isn't going to help much, since with either 77.0 or 146.2 you're only going to hear either the dispatcher only or crews only. All of our road channels are carrier squelch.

    As for keeping track of which radio have the proper tones, it's not hard since most railroads have radio maintainers who's job is to maintain a database on all radios and to do all programming. Amtrak uses a tone of 103.5 for their tone knockdown along their lines. Railroads like the Providence & Worcester, CSX and Pan Am all use carrier squelch. As per common practice with most railroads, carrier squelch is used where ever other railroads interchange with other railroads for interoperability . Railroads that don't interchange with anyone usually will use PL tones, like New Hampshire Northcoast railroad which uses NXDN for their territory and only use Pan Am channels when interchanging with or operating on Pan Am.
    Last edited by KB1KVD; 04-20-2017 at 11:29.
    Jason,KB1KVD/WQQQ874/C&S R103
    Radio Maintainer Out....

  5. #5
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    Jason, a question for you. I've noticed what appear to be VHF base antennas on most of the signal bungalows on Keolis property. The one pictured is at Frost in Lawrence. Any idea what these are for?
    Click image for larger version. 

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    Jacob
    KB1VLA

  6. #6
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    The antenna in question is for a temporary base station (Icom F5061 and Astron SL-11R) that we setup for the signal department so they can test signal systems. Whenever the signal department uses the radio they're 161.265 (AAR 077).
    Jason,KB1KVD/WQQQ874/C&S R103
    Radio Maintainer Out....

  7. #7
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    Ah! Gotcha, thanks.
    Jacob
    KB1VLA

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