March ARB Trunked System

There have been some changes to the March Air Reserve Base VHF P-25 trunked radio system in Riverside, California. These changes might not be obvious to listeners in the area.

The system is still P25 Phase 1, but it has had a change in some of the frequencies and now is part of the larger US Air Force 3D6 trunked system. 

Here are the specifics of the current system:

System ID : 3D6
System Name : March ARB
WACN : BEE00
Tower Number (Decimal): 1-13
Tower Number (Hex) : T010D
Tower Description : Single Site
Flavor : Phase 1

System Frequencies
138.08750
138.11250
138.13750
138.26250
138.41250
138.51250
138.61250
138.63750
138.68750
138.71250

The system information on March ARB on the Radio Reference site has not been updated to reflect these changes, but here is some information on the USAF 3D6 trunked system: https://www.radioreference.com/apps/db/?sid=7769
 

FCI Sheridan TRS

I had a chance to stop by the Federal Correctional Institution in Sheridan, OR this week, so I could check on what type of radio system is in use there. It turns out to be the same system I found last time I was there 6 or 7 years ago.

Even with some federal prison facilities now upgrading or replacing systems with P-25 digital trunked systems, many are still using the Motorola type II trunking. In this case, they are still type II with digital voice. 

Here are the goods on their current trunked system:

Sheridan Federal Correctional Institution
Sys ID - A81C
Voice NAC - $1C5
 
408.8125
409.0125
409.4125
409.9500
410.5250

Scanner Band Plan
Base - 408.8125
Step - 12.5 KHz
Offset - 380