[Scan-DC] Montgomery FD Mutual Aid

Thu, 31 Jul 2003 17:41:40 +0000

Reference the digital not exactly correct, DCFD, Fairfax County, Loudon 
County, Prince William Co, Airport Authority for Dulles and National, 
Manassas City and Manassas Park are also digital.

>From: "Doug K." <[email protected]>
>To: [email protected], [email protected]
>Subject: Re: [Scan-DC] Montgomery FD Mutual Aid
>Date: Tue, 29 Jul 2003 09:27:47 -0400
>
>I wondered how they were gonna handle this - Mtgy is the only jurisdiction 
>around here that's on digital, right?  Everyone else that's on 800 is 
>analog?
>
>Thanks Andy - I wish I understood this trunking and talk group business 
>better tho!  :)
>
>Regards,
>
>Doug
>
>
>>From: "Andy" <[email protected]>
>>To: <[email protected]>
>>Subject: Re: [Scan-DC] Montgomery FD Mutual Aid
>>Date: Mon, 28 Jul 2003 19:06:38 -0400
>>
>>Interesting and coincidental!
>>
>>I think I've just stumbled upon the answer to this.  I was just sitting 
>>here
>>listening to a Frederick Co. Mutual Aid response into MoCo and monitored 
>>the
>>TT TG 49180 operating in analog mode.  This TG was multi-selected with TT 
>>TG
>>3376, so a multi-cast patch was formed.  What I believe this translates 
>>into
>>is that Frederick County units must have an assigned TG on their own 
>>system
>>which is patched into MoCo's ASTRO system on that 49xxx TG.  Since the 
>>49xxx
>>TG on the MoCo side is in analog only mode, its probably set up just for
>>Frederick County units, or for that matter any other 800 MHz jurisdiction
>>with an analog only TRS, like Carroll County, Alexandria and Arlington
>>Counties (Ya never know).  I could be totally wrong, but that's how it
>>appeared to me.  What's more is that last weekend I monitored TT TG49200 
>>as
>>a mutual aid analog only TG.  It may be setup as dynamic regrouping, but
>>that's a little over my head on how that works.  So FDMA-4 might be that
>>analog patch from Frederick Co. units to the MoCo ASTRO system operations
>>TG's.
>>
>>Andy
>
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