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State of Hawaii Airports Division moving operations to Project 25 digital trunked radio system. System information (especially talkgroups) are appreciated.

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Waikiki Trolley and Multiple Users
System Type: LTR Standard
RF Band: 400 MHz

Introduction
This LTR system is located in Waikiki and has numerous users including the Waikiki Trolley and area hotels. Armed with a Radio Shack Pro-97 scanner, I was able to scan through the upper UHF band and note down and confirm logical channel numbers assignments for the following frequencies. System frequencies may not be related to one another, as we get a whole wide array of different users on this system.

System Layout
Single site system located in Waikiki.

System Users

Radios Used

Monitoring This System
Any scanner with LTR trunking capability can be used to monitor this system.

System FrequenciEs
The following page lists system frequencies in LCN order. Frequencies must be programmed in the correct channel slot as indicated in order to hear system traffic. Failure to do this will result in your scanner tuning into a wrong transmission or completely miss a transmission altogether.

The talkgroup ID format for an LTR system is AA-HH-UUU, where "HH" is the home, or main, channel that the user is assigned. The talkgroup ID one way of determining a systems logical channel numbering (LCN) order. When an LTR system is idle, all transmissions will be done on the home channel. However, if the home channel is in use and there are multiple users who share the same home channel wants to use the radio system, other radios will "trunk" to different frequencies within that particular system to carry on the conversation.

The big caveat then, is that even if the LCN order might appear correct, the frequencies entered might not be related to the system you're monitoring. If the home channel is busy and the radio needs to trunk to an alternate channel, but the alternate channel in your scanner has an incorrect or no frequency, your scanner will not track the system properly.

This is what I suspect with this system, but have not encountered any situation where the radio had to trunk to a different frequency. Currently working to refine and compare information between what I have and what's on the FCC database.

SITE 1 - WAIKIKI
08-462.4750, 11-461.5500, 12-463.9375, 13-461.4625, 14-464.9625, 15-461.6875, 19-462.4250

System Talkgroups

TGID
HOME CHANNEL
DESCRIPTION
DISPLAY
MODE
0-12-110
0-13-014
0-13-108
0-15-014
0-15-055
12 (463.9375)
13 (461.4625)
13 (461.4625)
15 (461.6875)
15 (461.6875)
WAIKIKI TROLLEY OPS?
PRIVATE SECURITY [MULTI LOCATIONS]
OLI DRIVERS?
PRIVATE SECURITY [MULTI LOCATIONS]
PRIVATE SECURITY [MULTI LOCATIONS]
 
ANALOG
ANALOG
ANALOG
ANALOG
ANALOG

Unknown Talkgroups

TGID
HOME CHANNEL
DESCRIPTION
DISPLAY
MODE
0-08-005
0-08-231
0-11-080
0-12-018
0-14-005
0-14-029
0-19-008
08 (462.4750)
08 (462.4750)
11 (461.5500)
12 (463.9375)
14 (464.9625)
14 (464.9625)
19 (462.4250)
UNKNOWN
UNKNOWN
UNKNOWN
UNKNOWN
UNKNOWN
UNKNOWN
UNKNOWN
 
ANALOG
ANALOG
ANALOG
ANALOG
ANALOG
ANALOG
ANALOG

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Webguy: David J. Cabatu, AH7E
Updated: 11.30.2008 at 3:12 p.m.