Saturday, February 28, 2015

March 2015 TSM Update/Correction

The March 2015 issue of The Spectrum Monitor is now available for publication. You can get a copy here:

In this issue I have some information on federal use of aviation resources and the frequencies that might be used. Unfortunately, one frequency got mangled in the publication process. The list of CBP AIR frequencies should have AIR 9 as 163.4750 MHz, N293.

You can check out the entire list in the CBP Updates tab on the blog home page:

Friday, January 16, 2015

FPS Atlanta Mystery

I am seeing reports on Radio Reference that the multi-site UHF trunked system managed by the Federal Protective Service (FPS) is not longer on the are in the metro Atlanta, GA area. Folks are asking what happened and where did the FPS operations go.

I haven't been down in the Atlanta area in a few years, but when I was there last, the Federal Protective Service appeared to be running a 4 site UHF Motorola Type II trunked system with both analog and digital voice. One of the subscriber agencies appeared to be Dobbins Air Force Base.
Here are the system specs as I had them:

FPS Atlanta
Motorola Type II
System ID - 750d
Voice NAC - N0d0
Site 1 - Atlanta
406.4125, 407.2125, 408.5375, 410.1250
Site 2
406.5625, 407.1625, 408.5625, 410.3625, 410.5625
Site 3
407.3625, 408.3625, 408.7625, 409.3625, 410.7625
Site 4 - Dobbins AFB
406.7625, 406.9625, 407.5625, 407.8625, 408.9625

Since my last time monitoring the system, it appears that Dobbins AFB has built out their own 380 MHz P25 trunked radio system, so they were no longer using the FPAS managed system.

Reports on Radio Reference include some VHF channels (173.7125, 173.9125 and 173.9875 MHz) that claim to be "TRS control channels", but are very weak in downtown Atlanta.

I suspect that if the FPS decided to dismantle the trunked system, they have probably returned to conventional UHF channels, most likely APCO P25.

Can anyone in the Atlanta area offer any further information?

A listener in the area reports that the FPS is using 410.8000 MHz, N201 for their operations and has been for some time now. I checked my logs from my last trip to the area in 2012 and I did not get any hits on that frequency.

Friday, November 14, 2014

October 2014 Federal Wavelengths Correction

A sharp-eyed reader just brought it to me attention that there were a couple of errors in my listing of the frequencies used by the Environmental Protection Agency (EPA) in the October issue of The Spectrum Monitor magazine.

By all means, if you spot something with any frequency lists either here on the Fed Files blog page or in the pages of The Spectrum Monitor magazine, please feel free to let us know about it.

Here is the corrected list showing the correct EPA repeater input and output frequencies:

ZONE 2 – EPA Repeaters

Repeater Output   Repeater Input    Channel Name
173.8750, D731    166.4750, D731    EPA REPEATER

170.9750, CSQ     168.7000, CSQ     NI/CG REPEATER 1

170.4500, CSQ     168.1000, CSQ     NI/CG REPEATER 2

170.4250, CSQ     168.0750, CSQ     NI/CG REPEATER 3

168.4000, CSQ     166.6125, CSQ     NI/CG REPEATER 4

169.7500, CSQ     167.1000, CSQ     NI/CG REPEATER 5

173.8125, CSQ     168.4750, CSQ     NI/CG REPEATER 6

170.9750, CSQ                       NI/CG SIMPLEX 1           

170.4500, CSQ                       NI/CG SIMPLEX 2

170.4250, CSQ                       NI/CG SIMPLEX 3   

168.4000, CSQ                       NI/CG SIMPLEX 4

169.7500, CSQ                       NI/CG SIMPLEX 5

173.8125, CSQ                       NI/CG SIMPLEX 6

Saturday, November 01, 2014

South Florida FPS Changes

In addition to the upgrades to the Customs and Border Protection (CBP) radio network in Florida, it appears that the Federal Protective Service (FPS) has also upgraded to P25 digital.

410.8 MHz, N201 is now being used by the FPS in the Miami area. The same frequency is most likely used through out this FPS region. Some sites may have different NAC's.

You can read more about the CBP upgrades and frequency changes in the latest edition of The Spectrum Monitor,

Tuesday, September 30, 2014

CDC Frequencies

Some questions regarding the use of radios by the Centers For Disease Control and Prevention (CDC) have been posted in regards to the confirmation of Ebola in the Dallas, Texas area.

I know that the CDC uses federal UHF trunking at their fixed facilities around the Atlanta area. But a while back I posted possible CDC field use frequencies that might have been in use for the Swine Flu outbreak:

Department of Health & Human Services (All frequencies are in MHz);

41.430 (Nationwide)
41.470 (Nationwide)
41.530 (Nationwide)
41.650 (Nationwide)
41.690 (Nationwide)
41.790 (Nationwide)

163.2500 (Nationwide Medical Paging Allocation)
164.3000 (Nationwide)
164.9875 (Nationwide)
171.2375 (Nationwide – shared)

407.7000 / 416.7000
408.0500 / 417.0500
409.0000 / 418.0000
410.0250 / 419.0250
410.2000 / 419.2000
410.2250 / 419.2250
410.4000 / 419.4000
410.4250 / 419.4250
411.2250 – Simplex
411.4500 – Simplex
411.8250 – Simplex
413.4500 – Simplex
413.8750 – Simplex
415.4000 / 406.4000
415.8250 / 406.8250
415.9250 / 406.9250
416.9750 / 407.9750
417.6500 / 408.6500
417.7000 / 408.7000
419.1500 / 410.1500
419.6000 / 410.6000
419.6250 / 410.6250
419.8000 / 410.8000

Saturday, September 27, 2014

Email Apologies To All

To anyone and everyone who might have been sending me emails to the address - I realized that I have not been seeing any emails from that address for a while and just assumed no one was sending me anything. But a Fed Files fan on Twitter asked about an email he sent that I hadn't seen on any of my computers or email devices. I discovered that my emails were just sitting there and I wasn't seeing them. I've been trying to catch up on these as I can. 

Please continue to use this email address for future communications:

Friday, September 05, 2014

CBP Florida Makes The P25 Switch

Over the last couple of years I have heard that the CBP was coordinating and installing new P25 digital gear in the state of Florida.

I just spotted a post on Radio Reference that indicates the Customs and Border Protection radio systems in Florida have finally moved towards the digital domain after being analog for many years:

There are what appear to be some of the new CBP DNET channels in the +170 MHz end of the band, so I will list them as they can be ID'd in the CBP Frequency Update area on the blog main page.