Saturday, September 23, 2017

KSC Updates Trunking System

The UHF band trunked radio system at the Kennedy Space Center in Florida has received and upgrade from the older Motorola Type II system to a new APCO P-25 Phase II system.

The changes occurred just recently, even as Hurricane Irma threatened the entire state of Florida. Some listeners have posted questions on Radio Reference wondering why they can't hear the KSC trunked system any more.

The new system reportedly has three separate trunked sites and is not simulcast, but using different frequencies at each site.

I will have more information as it becomes available! Check back with this blog...

Wednesday, July 26, 2017

New VHF Trunking at Lake Mead

On a recent visit to Hoover Dam and Lake Mead, near Las Vegas, I discovered a VHF trunking control channel. It appears to be a two-site VHF P-25 trunked system, likely to cover both the Hoover Dam area and likely the Lake Mead National Recreation Area.

I had  received reports of hearing the control channel from site 2112 on 172.1375 MHz, and I found the control channel for site 2122 on 172.1375 MHz loud and clear at the Hoover Dam via a close call hit on my Uniden 436 scanner. I was unable to pick up the control channel from site 2112 on my visit.

It only shows two sites on the air right now, and no users were seen affiliating or using the system while I was monitoring. Both the Hoover Dam police and Lake Mead NRA operations were on their normal VHF conventional channels.

More information as the system usage increases.

Here is what I found via PRO96COM:

System ID             : A52
WACN                  : BD000
Tower Number (Decimal): 2-122
Tower Number (Hex)    : T027A
Flavor                : Phase 1

#Format: Table ID,Base Freq,Spacing,Input Offset,Assumed/Confirmed,BandWidth,Slots

#Format: Channel,Usage,Frequency(/Slot),Input Channel,Input Frequency(/Slot),Input Explicit(1/0),Hit Count

#Format: TowerID,TowerIDHex,System ID,Channel,Frequency,Tower Name

Tuesday, June 27, 2017

172.1875 LA AREA

Caught a new one for me in the LA area last week. I was working up in Burbank and caught a transmission on 172.1875 MHz, N167, the FBI with a possible bank robbery. The dispatcher was looking for any unit available to cover. Radio ID matched the FBI.

Previously, I have caught traffic on this frequency using a NAC of N195, reportedly the CBP IWN repeater called BROWNFIELD 2. It certainly is possible for them to re-use this frequency, and the FBI use is probably north of the LA Downtown area.

Also, just updated TSA information for the Bob Hope Burbank Airport. You can find these updates in the TSA Frequency Updates section on the main blog page:

Tuesday, April 25, 2017

USSS CIO Interview

If you have some time, take a while and give a listen to an interview with Retired Brig. Gen. Kevin Nally, the Secret Service’s Chief Information Officer. Interesting information about IT in the Secret Service:

Nally, formerly the CIO of the Marine Corps, talks about "mobile" technology around 16 minutes into the audio file. Discussions include new Secret Service radios and antennas in the DC area.

Thursday, April 06, 2017

Luke AFB Migrates to 380 MHz P25 System

According to recent postings on Radio Reference, the trunked radio system at Luke Air Force Base in Glendale, Arizona has changed frequencies. The system moved from being in the 400 MHz federal band to the 380 MHz DoD managed spectrum.

One listener posted the control channel data he had deciphered: 


The system ID and WACN indicate this is part of the larger US Air Force 3D6 networked trunked system, featuring VHF, UHF and 380 MHz systems. This system also serves multiple military bases in the San Antonio, Texas area: 


Saturday, January 28, 2017

Changes Coming for VHF Marine Channels

There are changes coming for the normal FM marine channels. The International Telecommunications Union has (ITU) has began re-numbering some of the international marine channels in anticipation of 12.5 KHz channels and digital modulation coming to the VHF marine band. You can read more about the changes here:!!PDF-E.pdf

The US Coast Guard has some offerings that show some of the new marine VHF channel numbers:

Saturday, January 14, 2017

CHM Guide to the 58th Presidential Inauguration Now Available

Alan Henney and The Capitol Hill Monitor on line newsletter have recently made available their frequency guide for the upcoming inauguration. This issue is packed with all kinds of great information on what you might hear if you are going to the DC area for the events.

Thanks to Alan and all the contributors. You can find the CHM frequency guide here: