Greater Austin/Travis Regional Radio System (GATRRS)

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Revision as of 10:11, 6 January 2016 by Bote (talk | contribs) (add User Observations section to capture notes which are not ready for the database.)
System Name Greater Austin/Travis Regional Radio System (GATRRS)
System Type APCO Project 25 Phase I
System ID 13E
Connect Tone ?
Wide Area Communications Network ?
Network Access Code ?
TRBO Color Code ?
Band VHF Hi / 700 / 800
County Various
State Texas
Ownership Public

Greater Austin/Travis Regional Radio System (GATRRS) RR DB Entry
Greater Austin/Travis Regional Radio System (GATRRS) Site Map from the RRDB
Texas Discussion Forum

PDF Card

Welcome to the Greater Austin/Travis Regional Radio System (GATRRS) collaboration article, a Trunked Radio System located in Texas.
This is where you, the user, may index any articles you develop for scanning related topics for this Trunked Radio System.

System Users

The following agencies use this system:

  • City of Austin (including APD, AFD, EMS, Convention Center, trash, water, streets, animal control, etc)
  • Travis County (TCSO, parks, school crossing guards, road crews, corrections)
  • Travis County Fire/EMS Agencies including STARflight talking to those agencies
  • Austin ISD police, busses and within the schools.
  • Austin Community College (ACC Police mostly)
  • Capital Metro is using LCRA system.
  • Cities of Manor, Lakeway, Pflugerville, Rollingwood, West Lake Hills
  • Texas Department of Public Safety (DPS) along with the VHF also.
  • Texas DOT is mostly using the LCRA system; except maintenance on cameras and freeway signs.
  • Texas Legislative Council (very little heard and mostly on 700 Mhz)
  • Texas House of Representatives (very little heard and mostly on 700 Mhz)
  • The University of Texas police, maintenance, events
  • Williamson County mostly scrambled
  • Cities of Cedar Park, Georgetown, Leander and Round Rock mostly scrambled
  • Bastrop County using 2 systems (2 towers)
  • Caldwell County 700 and 800 Mhz
  • Lee County not much traffic heard
  • Agencies in the Middle Rio Grande Valley
  • Burnet, Blanco and Llano County along with some old VHF

System Technical Details

  • 95% coverage for portable radio worn on hip inside a -10 dB building (residential or light commercial structure) throughout City of Austin and Travis County.
  • 95% coverage for portable radio worn on hip inside a -20 dB building located within defined geographical area of Austin.
  • All digital system to reduce monitoring of radio transmissions - Encryption provided to special Law Enforcement talk groups.

Note the mention of designing the system to reduce public monitoring of a public funded public safety system.

Below is a system map of simulcast sites and IR (Intelli-Repeater Sites) making up this system. This map portrays Travis County sites only and does not include Williamson County, the Middle Rio Grande Valley sites or any of the planned expansion counties.


This system is implemented as a two layer simulcast system with "intellirepeater" fill-in sites within Austin/Travis County and networked multisite nodes for other counties/areas.

Austin/TC EMS and TCSO function on the countywide layer comprised of 11 towers supporting 23 simultaneous conversations. The City wide layer, primarily east of 620, is comprised of 7 towers supporting 19 simultaneous conversations. Additionally, individual intellirepeater sites serve difficult coverage areas such as Barton Creek and Hamilton Pool. Williamson County joined the system in November 2007 migrating their frequencies and towers implemented as a networked site (site 120). The Middle Rio Grande Valley is also implemented as a networked site. Any unit/talkgroup can appear on any site in this system.

Simulcast 1 is mostly Public Safety: including APD, EMS, AFD, Travis County Sheriff, Corrections, Travis County Parks

Simulcast 2 is mostly city and county services including convention center, trash, water, streets, signal repair, Austin Energy, Animal Control, flood control, school crossing guards, Parks and Rec, AISD including busses, etc.

Several counties in Central Texas are planning to join this system forming a wide-area networked system. This includes Bastrop, Caldwell, Fayette and Lee counties. Combining these systems in this fashion will enable communications between any unit/agency from anywhere within the combined coverage area. As these individual counties migrate to P25 digital they will merge with Austin/Travis County system increasing the total coverage area for all users.

User Observations

1473 is not Security Team 2; they are discussing which baggage conveyor belts to use. As far as I know there is only one security talkgroup.

They have allocated to them Facilities Maintenance, Building Maintenance, and Airfield Maintenance. There are also Operations, which deals with things like flights being late and gate changes and such, and Operations Security, which are the heavily armed men in black roaming the concourse. There are 4 talkgroups allocated for general purpose airport use that are not used for anything. There are a few others as well. I can't identify which talkgroup number goes with which use however.

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