This article first appeared in the January 2003 issue of Monitoring Times.


The United States military relies on trunked radio to provide efficient, reliable communication for the day-to-day administrative tasks of running bases and camps. Monitoring these systems can be a challenge, since frequencies for military trunked radios are often more difficult to determine than for public safety agencies. The Federal Communications Commission (FCC) databases that are so useful for commercial and local government systems do not contain Federal government frequency assignments, so a good deal more investigation is necessary.

Howdy Dan,

I'm a regular subscriber to Monitoring Times and your "Tracking the Trunks" column is fantastic. I used to monitor Fort Bragg, North Carolina's trunked federal system (406-420mhz) in the conventional mode before they went digital. Can you advise if the new Uniden Bc785D or BC250D with digital card installed will enable me to monitor federal trunked systems operating in the digital mode?

Thanks, Broadus

My records show that Fort Bragg, North Carolina, shares a Motorola Type II system with Pope Air Force Base. It's believed to have 28 channels, and unless transmissions are encrypted you should be able to use a BC250D or BC785D (with a BCi25 card) to listen to the audio and track trunked conversations. Please write again and let us know what you find!

Many military systems operate in the 400 MHz range, with a standard base of 406.000 MHz and an offset of 25 kHz. Some other military installations, along with talkgroup information (in decimal) when available:

Aberdeen Proving Ground (APG), Maryland

APG, among other things, performs environmental and safety testing on a variety of tactical wheeled and tracked vehicles. Live fire from Abrams tanks and Bradley fighting vehicles is common. APG operates a Motorola Type II system that carries both analog and digital voice traffic. Frequencies for Aberdeen and the adjacent Edgewood Area are 406.225, 406.350, 406.700, 407.250, 407.275, 407.475, 408.550, 409.025, 409.500 and 410.150 MHz.

688 Range Clearances

1904 APG Police

Air Force Academy, near Colorado Springs, Colorado

The Academy operates a Motorola digital system on several 400 MHz frequencies including 407.150, 407.350, 407.950, 409.025, 409.225, 409.500, 409.750 and 409.775 MHz.

Andrews Air Force Base, Suitland, Maryland

Andrews is home base for Air Force One, the President's official aircraft. Andrews has also been the center of activity for combat air patrols flown over Washington, D.C. after the terrorist attacks of September 2001. Frequencies in use: 406.350, 406.950, 407.150, 407.425, 408.025, 408.200, 408.750, 409.350 and 409.725 MHz.

176 Presidential Pilots Office

208 Command Post Operations

432 Emergency

1136 1st Helicopter Squadron Operations

1776 Field Operations (1)

1808 Field Operations (2)

Edwards Air Force Base, California

Edwards has served as a flight test range for decades and is also the West Coast landing area for the space shuttle. Apparently there are two Motorola systems here, one with frequencies of 408.200, 409.225, 409.550, 409.775, 409.825, 410.150, 410.525 and 410.750 MHz, and the other using 406.350, 406.750, 408.175, 409.125, 409.500, 409.650, 409.750 and 410.400 MHz.

Fort Huachuca, Sierra Vista, Arizona

The Army performs a good deal of classified communications-related work here in southern Arizona. The Motorola Type II system on base uses 406.950, 407.150, 407.550, 407.950, 408.150, 408.350, 408.750 and 409.150 MHz.

Luke Air Force Base, Glendale, Arizona

Luke AFB is a major training center for fighter pilots and is home to more than 200 military aircraft. The Motorola trunked system has been heard on 407.150, 407.950, 408.150, 408.200, 408.750, 409.150, 409.375, 409.550, 409.775 and 409.950 MHz.

Camp Lejeune, North Carolina

This Marine Corps base covers a large geographic area and provides training and mission preparation. Frequencies used on the Motorola system are 406.350, 406.950, 407.150, 408.550, 408.750, 409.550, 409.750 MHz. Use a base frequency of 406.350 MHz and an offset of 50 kHz.

80 Military Police Dispatch

624 Camp Johnson Operations

656 Marine Combat Training

1744 Fire Dispatch

9008 New River Air Station Base Operations

Fort Meade, Maryland

This Army base is probably most famous for being home to the National Security Agency (NSA). The Motorola Type II system uses 406.325, 407.400, 407.575 and 409.450 MHz.

48 Fire Dispatch

80 Fire Operations (1)

112 Fire Operations (2)

368 Military Police Dispatch

400 Tactical

464 Gate Security

880 Command and Control

Patuxent River Naval Air Warfare Center, Patuxent River, Maryland

Informally known as "Test Pilot School," Pax River trains Navy test pilots and performs a variety of aircraft flight testing. Possible frequencies include 406.350, 410.150, 411.325, 412.050, 412.750, 416.950, 417.925 and 419.675 MHz.

Camp Pendleton, California

This West Coast Marine Corps training facility uses a Motorola Type II system on 406.550, 406.950, 407.175, 407.300, 407.325, 408.200, 408.750, 409.275, 409.750, 409.950 and 410.150 MHz.

592 Naval Hospital Security

1424 Range Control (Range 2)

5584 Range Control (Range 1)

Peterson Air Force Base, near Cheyenne Mountain, Colorado

The 21st Space Wing provides missile warning through NORAD, the North American Aerospace Defense, and space control through the U.S. Space Command. The Global Positioning System (GPS) is also controlled from here. Frequencies on the Motorola Type II are 406.350, 406.550, 407.150, 407.350, 407.950, 408.750, 408.950, 409.550, 409.750, 409.950 MHz.

16 Peterson Ground

272 Fire/Rescue TAC

368 Peterson Crash

496 Base Operations

528 U.S. Air Force Museum

1072 Flight Line Operations

Vandenberg Air Force Base, California

Vandenberg serves as launch facility for many military and commercial satellites. The Motorola Type II frequencies are 407.150, 407.550, 408.750, 408.950 409.150, 409.350, 409.550, 409.750, 409.950 and 410.150 MHz.

Wright-Patterson Air Force Base, near Dayton, Ohio

The extensive aircraft museum at "Wright-Pat" is familiar to many Dayton HamVention attendees, but there's more going on there than tourism. The frequencies on the Motorola Type II system are 406.350, 406.550, 407.150, 407.350, 407.950, 408.750, 408.950, 409.550, 409.750 and 409.950 MHz. Use a base frequency of 406.350 MHz and an offset of 50 kHz.

368 Crash Crews

8016 Security (1)

8048 Security (2)

8080 Security (3)

11312 Flight Operations

Finding Scanner Manuals


I tried to bring up to get a manual for my Pro39 scanner, but it wouldn't come up. Is this the right one or do you know another. Thanks for your articles...I enjoy reading them.


Manuals for many scanners, old and new, are available on the Internet. Most of these electronic manuals are in Portable Document Format (PDF) and require the use of free reader software from Adobe Systems, Inc., called Acrobat Reader. If you do not have this program installed already, go to and download it.

Retrieving manuals is helpful not only for current owners, but for anyone contemplating purchasing a new or used scanner. Reading the manual before spending money is a more cost-effective way of finding out whether the unit you're looking at has the features, performance, coverage and ease-of-use that you're looking for.

Manuals and other support information for scanners sold by Radio Shack are available for downloading at DocumentDetail/DocumentDetailIndex.asp?P=support_electronics&D=2849&T=htm or, go to, click on the "Product Manuals" button, then select "Communications" from the list of subjects. Select "Scanners" from the next screen and you'll be presented with a list of just over 100 scanner models, everything from the PRO-20 and PRO-22 up to the PRO-92 and PRO-95.

Uniden has a slick web site at, and their scanner product support page is located at

The manuals for the new BC250D and BC785D digital scanners are already available there.

AOR has a website with a number of manuals for discontinued scanners dating back to the AR880 and AR900. There's even a manual for their ADU5000 external spectrum display unit. The manuals can be found at

Icom maintains a technical document section on their web site at where you can find manuals for their current production receivers (down near the bottom of the page).

If you don't have any luck finding an electronic manual to download, you'll probably have to go back to the old-fashioned paper kind. Sometimes calling or writing to the manufacturer can yield a free or inexpensive copy mailed to you. There are also a number of individuals who sell original and photocopied manuals for scanners, as well as for test equipment, ham radio gear and other electronics. The Hobby Radio Stop in Ohio has many, many manuals for older radios. You can find them on the web at Manual Man (Peter Markavage),, and Gary Gompf, W7FG at, each have hundreds of manuals for a wide variety of electronic equipment, including scanners.

So Bob, the support page for the PRO-39 can be found directly by going to DocumentDetail/DocumentDetailIndex.asp?P=support_electronics&D=2849&T=htm

Hope this helps!

Cincinnati Airport

Dear Mr. Veeneman:

I've just read your "Tracking The Trunks" column in the September 2002 edition of Monitoring Times. Thanks very much for the information on Hamilton County, Ohio and Cincinnati.

However, somehow, the headline of " * Boone and Kenton Counties, Kentucky" was omitted before the paragraphs about the radio systems in use at Cincinnati-Northern Kentucky International Airport. That omission gives readers unfamiliar with the greater Cincinnati area the impression that the airport is located in Hamilton County, Ohio when it is not. Also, the inference can be made that in the case of a major event at the airport that Cincinnati and Hamilton County authorities would be the ones first called on to assist when, more likely, agencies in Kenton and Boone Counties would be first.

A bit of information (or confusion, depending on one's viewpoint,) is in order. Cincinnati-Northern Kentucky International Airport is located in Boone County, Kentucky near the town of Hebron. Though the airport is located in Boone County, Kentucky, it is owned by Kenton County, Kentucky.

I believe that it might be a good idea to mention the headline omission and clarify the information to the Monitoring Times readership. I'm sure it would be appreciated.


Thanks for clearing that up, Bradley. Often the airports serving major metropolitan areas are not located within the center city limits, but how many are actually located in an adjoining state?

OpenSky in Pennsylvania


I read your column with great interest and was wondering if you could give an update on how the OpenSky installation is coming along in Pennsylvania. Also, with the new Uniden scanners coming out soon will I be able to monitor OpenSky radios?

Thanks, Gregory

In 1996 the state of Pennsylvania began a process to investigate replacement alternatives for their aging patchwork of radios. They eventually settled on an all-digital system from M/A COM (now owned by Tyco Electronics) called OpenSky, which is based on Internet transmission standards. Participation by counties and local municipalities is not mandatory, and may jurisdictions have chosen not to join. The latest rumors indicate testing is underway in the state capitol, Harrisburg, but that some problems have emerged (not surprising for a brand new system) and that things are moving more slowly than expected.

OpenSky transmissions are not compatible with Project 25 equipment or standards. OpenSky uses a different vocoder (AMBE, or advanced multiband excitation) and uses time division multiple access (TDMA) to fit two simultaneous conversations into a single radio channel. The new Uniden scanners will not be able to understand the format or content of the OpenSky digital signal. At this point hobbyists who want to monitor OpenSky have very few choices, all of which boil down to using a M/A COM OpenSky radio pre-programmed with the Pennsylvania radio system parameters. There was talk early on about some type of purchase program for journalists and possibly hobbyists, but given the slow and difficult testing schedule such a program may be postponed.

That is all for this month. Keep those e-mails coming to dan @, and check my website at for more digital scanner information, including frequencies. Until next month, happy monitoring!

Comments to Dan Veeneman

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