[FedCom] input(s) 170.625

Tue, 06 Jan 2004 03:19:20 +0000

>From: Steven Donnell WA1YKL <[email protected]>
>Reply-To: [email protected]
>To: [email protected]
>Subject: Re: [FedCom] TSA at Portland (Maine) Jetport, et. al.
>Date: Sun, 04 Jan 2004 19:18:01 -0500
>
>Hi, The 170.625, at least heard here in S NewHampshire is the output of a
>Border Patrol rpt, in/near VT; Ive units surveying vehicle traffic along rt 
>91.
>Some is clear, mostly encrypted, P25 mode.
>
>Are you using a P25 scanner?, as P25 and (analog)DES sound quite similiar. 
>One
>easy way to tell, at least w/ a repeater is w/ P25, the idle/tail of a rpt
>transmission will have a "buzz" sound where the tail end of a DES tx has 
>that
>distinctive high pitch whine.    Steve
>
>
>HornSmoke wrote:
>
> > Folks, I dropped off family at the Portland Jetport (PWM) yesterday 
>morning
> > and got a confirmed TSA  on 172.150. There was a split-second drop of
> >  encryption, and a DPL of 145 registered. This happened twice, which
> > leads me to believe it is accurate. I was sitting 500 meters or less
> > away from the terminal, and had it full quieting.
> >
> > Extensive traffic in Maine on 170.625; Customs/BP? Mostly encrypted; PL
> > tone of 151.4 shows up, even WITH the encryption, about 70% of the time
> > there is a transmission. One would think that they'd hide the PL in the
> > encryption process.
> >
> > "Foxtrot" units are the primary users on the 170.625. I'm quite sure
> > there are multiple repeaters with this output positioned along the
> > western Maine border with New Hampshire and Canada. I'd welcome any
> > "input as to the input" to this freq. I also suspect that there is a
> > linked system, with varying input PL's matched to the standard output PL
> > of 151.4, much like our civilian LifeFlight helo ambulatory transport
> > here in Maine that utilizes multiple towers on 453.650R with a universal
> > pl tone output of 103.5. The +5 MHz input has a different PL for each
> > tower. Could any of the Group Gurus enlighten us as to any known federal
> > S.O.P.'s along these lines? Or, is it up to each individual radio shop
> > how the system is programmed?
> >
> > To codify my rambling questions, they are as follows:
> >
> > 1) Input to 170.625?
> > 2) Possible linked repeater system on 170.625? New Hampshire monitors
> > could especially help here.
> > 3) Programming Standard Operating Procedure in federal radio shops, as
> > there is a proliferation of "cross-agency" usage.
> > 4) Group experience on how PL/DPL tones are either suppressed or "in the
> > clear" when encryption is used.
> >
> > Thanks in advance for any help.
> >
> > Best to the Group from wintery Maine,
> >
> > Loren
> >
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> > [email protected]
> > http://mailman.qth.net/mailman/listinfo/fedcom
>
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  If 170.625 is the old "Border Patrol" (and it Should be), input is 
probably between 162.825 and 162.975 (check in 12.5 steps, here 162.925, 
9375, 950, 9625, and 975 are ALL used)
              On the Mexican Border,  Ruff

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