FBI Multiple Repeater Keyups Re: [FedCom] FBI DFW

[Ken]

Hello Blaine & the group:

Some additional comments to my first posting on this subject.

Here in the Springfield MA area I've noted the same multiple keyups.
My guess is that originally the FBI had only 1 repeater on a local mountain 
top/high hill BUT found that in certain local geographic areas, low power 
portable "in vehicle" operations had problems with consistently hitting the 
mountain top regional repeater.  So the FBI placed some "fill in" repeaters 
in certain geographic areas.   The actual users of the repeaters are based 
upon geographical location and not on specific function of the FBI or FBI 
sponsored/supported activity.

Now technically, it's unclear to me whether all the repeaters are linked via 
microwave or fiber optics OR if the "fill in repeater" outputs are actually 
inputs to the regional repeater.  Repeater outputs are all different 
frequencies.  The regional repeater is definitely linked to the Boston 
office.   When unencrypted the output CTCSS on all repeaters is 167.9. 
Again it's unclear to me IF different input CTCSS are also being used on 
each repeater input OR if just the channel selection just has a different 
repeater input frequency.

Overall we don't get much FBI radio traffic in our area.  Most of the time 
they are usually going to cellphones.  There's also some indication that 
Sprint/Nextel walkie talkie functional units may be used.

Ken



----- Original Message ----- 
From: "Blaine Brooks" <blaine.brooks at verizon.net>
To: "FEDCOM" <fedcom at mailman.qth.net>
Sent: Thursday, January 25, 2007 5:16 PM
Subject: [FedCom] FBI DFW


> Over the years I've noticed simultaneous repeater
> keyups on FBI frequencies in various cities I've lived
> in. During that time, I've just chalked it up to their voting
> system. However, it is sort of interesting, figuring out
> what repeaters are utilized by what RA's, investigative
> groups, DO's, etc. For what it's worth, here in DFW,
> simultaneous keyups occur on the following repeaters
> at times:
>
> 173.175 / 170.675
> 167.4375 / 167.7875
> 173.8125 / 167.3875
>
> Perhaps we can actually have an INTELLIGENT
> discussion of what others have heard in their listening
> areas?
>
> -- 
> Blaine Brooks
> The Flower Mound Scanner
> http://mysite.verizon.net/resrjsf6/
> IPN#DFW226 / FMCERT / DencoERT
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>