Federal Harris County (TX)
166.5625 M 192.8 PL Department of Agriculture Wildlife Services - distributing rabies
vaccine from helicopters in Fort Bend County area 9/17/2013
168.3500 M 100 NAC Department of Health and Human Services Secretary protective
173.8750 R 94.8 PL US Capitol Police "Travel 3" (Giffords detail at Hermann TIRR)
Unidentified federal frequencies monitored in Harris County, Texas:
141.6125 FFF NAC encrypted?
162.2375 M CSQ analog, CC hit around the Eastex and 610, informal conversation,
mobile-to-mobile chit chat on freeways in downtown Houston
162.7125 M? Marshals? P25?
162.7875 M 839 NAC Marshals? encrypted
162.7875 M 864 NAC Marshals? encrypted
162.9625 M CSQ chit chat
163.1000 M 101 NAC voice, encrypted
163.1125 M 496 NAC Federal Air Marshals/TSA VIPR? clear voice
163.6500 052 NAC ICE? P25 encrypted (heard during FBI fugitive search in Fort
Bend County area)
163.7000 M 164 NAC ICE? clear voice, encrypted
163.7000 M 206.5 PL voice
163.7125 M 103.5 PL "tac" car-to-car (USFS or NIFC?)
163.7375 M? 100 NAC encrypted
163.8125 M 864 NAC Marshals? encrypted
164.4500 M 151.4 PL car-to-car talk
164.7375 M 293 NAC surveillance?
165.0250 M CSQ heard during Hurricane Gustav
165.0750 M? 293 NAC Marshals? encrypted
165.6375 M 100.0 PL voice
165.6875 M 100.0 PL CBP new Net input?
165.6875 M 001 NAC Secret Service? encrypted
165.8250 M 060 NAC ICE? (used during NCAA Final Four 2011)
166.475 M 100.0 PL voice
166.4875 M 100.0 PL CBP new Net input?
166.5875 M 100.0 PL CBP new Net input?
166.625 M 250.3 PL voice
167.0875 M? 68F NAC NTIA LE-1/LE-A digital?, key-up, not encrypted
167.2125 EMWIN Data?
167.4000 M? 293 NAC voice
167.6750 M 293 NAC Marshals? encrypted
167.7250 M 103.5 PL voice, car-to-car
168.2625 R? 301 NAC CBP D-Net?
168.6125 M very weak/broken voice
168.7000 M CSQ National Incident Radio Support Cache (NIRSC) Command 1?
- analog voice and DES, surveillance
169.2500 I? 293 NAC FAA input?
169.3250 I? 293 NAC FAA input?
169.6375 data bursts, P25?
170.2625 R? 293 NAC encrypted
170.7250 M analog simplex voice during Hurricane Gustav
170.8000 M 293 NAC Marshals? encrypted
171.0250 R IFLOWS/Harris County Flood Alert System - League City repeater output, unconfirmed
171.2000 M DOE? NEST? - brief analog voice (NCAA Final Four 2011), also P25 or intermod?
171.3125 trunked control channel? very weak in Houston during good conditions
171.6125 M 864 NAC Marshals?
172.7000 I? 293 NAC encrypted, correlated with 170.2625 activity
172.9000 R CSQ somewhere near IAH airport
172.9500 R? 293 NAC FAA?
173.0500 S? telemetry at Hobby Airport? - chirping sound data
173.1625 R? P25?
173.7125 M? 293 NAC clear voice, aircraft?
173.8875 M? ATFE Tactical 6? - P25 encrypted
163.1000 M DES
164.5500 M OCDETF? DES
167.5125 M? FBI? DES?
167.5125 R? 167.9 PL FBI? lots of key-ups with weak signal (same time as 173.025),
feedback/squeaking, weak voice
167.5375 M FBI? DES
168.3500 M DES, analog voice
168.8625 M OCDETF? DES
168.9250 R 167.9 PL reported in MT Fed Files
170.0250 R? 167.9 PL FBI? weak, open mic/keyed-up dead air/static
170.8750 S CSQ FDC Houston - Prisoner Transportation between Court and Federal Detention Center (mobiles transmit 127.3 PL)
171.1750 R 167.9 PL FBI? near IAH airport, open mic/keyed-up dead air
(this may be obsolete, now P25)
173.0250 R? 167.9 PL FBI? lots of key-ups with weak signal (same time as 167.5125), DES
173.1000 R? 167.9 PL FBI? open mic dead air, DES
The Organized Crime Drug Enforcement Task Force (OCDETF) is a multi-agency federal task force (commonly associated with the FBI although many other agencies participate). The DES frequencies above initially remained in use after the FBI's conversion to P25 in the Houston area but have since gone silent.
406.1750 293 NAC encrypted
407.1250 293 NAC key-up (not encrypted)
410.0125 R? 293 NAC weak/broken voice in Houston
410.2000 M 293 NAC weak/broken voice in Houston
411.7875 M? 293 NAC Coast Guard? keyed-up for 3 seconds with a high pitch tone (NCAA Final Four 2011)
412.4375 206.5 PL constant dead carrier around UH Clear Lake/JSC area
413.9625 M? 201 NAC Federal Protective Service? voice
414.5625 M 168 NAC USPS OIG? encrypted
414.5625 M 169 NAC USPS OIG? encrypted
414.7500 M 169 NAC USPS OIG? encrypted
406.3750 R 114 DPL USPS Houston (Downtown) Processing and Distribution Center - Maintenance
410.2000 M 114 DPL USPS Houston (Downtown) Processing and Distribution Center - Maintenance Input
412.7000 R 125 DPL USPS Houston (Downtown) Processing and Distribution Center - Operations
413.1000 M 293 NAC DOS Diplomatic Security Service - Agent 3/Passport Agency Office (encryption used)
413.1250 M 293 NAC DOS Diplomatic Security Service - Agent 4 (encryption used)
413.8375 M 0F0 NAC DOS Diplomatic Security Service - Agent 2 (encryption used)
417.7000 M 125 DPL USPS Houston (Downtown) Processing and Distribution Center - Operations Input
- Army National Guard (Apache helicopters) - Ellington International Airport (Houston)
- Army Reserve (Apache helicopters) - Lone Star Executive Airport (Conroe)
- CBP - Lone Star Executive Airport (Conroe) - 1003 General Thomas Kelly Blvd.
- Coast Guard - Ellington International Airport (Houston)
- DEA - Lone Star Executive Airport (Conroe) - 10318 Dorbandt Drive source source source
- FBI - West Houston Airport (Houston) - identified via monitoring
- ICE - Contract repatriation flights operate to/from Bush Intercontinental Airport but there is no formal base there
- Marshals Service - JPATS flights operate to/from Ellington Airport but there is no formal base there
- NASA - Ellington International Airport (Houston)
The following CBP aircraft have been noted operating the Houston region.
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