Navigation & Radio at San Angelo Regional Mathis Field
US
SJT
/
KSJT
Radio Frequencies
8
Navigation Aids
3
Radio Frequencies
A/D
125.350 MHz
APP/DEP
ID: 66947
Ref: 3884
ATIS
128.450 MHz
ATIS
ID: 66948
Ref: 3884
A/D
125.350 MHz
APP/DEP
ID: 66947
Ref: 3884
CTAF
118.300 MHz
CTAF
ID: 66949
Ref: 3884
GND
121.900 MHz
GND
ID: 66950
Ref: 3884
RDO
122.250 MHz
RDO
ID: 66951
Ref: 3884
TWR
118.300 MHz
TWR
ID: 66952
Ref: 3884
UNIC
122.950 MHz
UNICOM
ID: 66953
Ref: 3884
Navigation Aids
SJ
NDB
0.356 MHz
Woole
Location
Latitude:
31.279900°
Longitude:
-100.575996°
Elevation:
N/A ft
Additional Info
Usage:
LO
Power:
MEDIUM
Mag Var:
6.446°
ID: 93644
SJT
VORTAC
115.100 MHz
San Angelo
Location
Latitude:
31.375000°
Longitude:
-100.455002°
Elevation:
1890 ft
Additional Info
Usage:
BOTH
Power:
HIGH
Mag Var:
6.411°
DME Information
Channel:
098X
Frequency:
115.100 MHz
ID: 93657
SJT
VORTAC
115.100 MHz
San Angelo
Location
Latitude:
31.375000°
Longitude:
-100.455002°
Elevation:
1890 ft
Additional Info
Usage:
BOTH
Power:
HIGH
Mag Var:
6.411°
DME Information
Channel:
098X
Frequency:
115.100 MHz
ID: 93657
Understanding Airport Navigation & Radio Communications
Radio Frequencies in Aviation
Radio frequencies are essential for communication between aircraft, air traffic control, and ground services. Here are the common types:
Common Frequency Types
- ATIS (Automatic Terminal Information Service): Continuous broadcast of airport conditions
- Ground: Communication with ground control for taxi instructions
- Tower: Communication with air traffic control tower
- Approach/Departure: Handling arriving and departing aircraft
- UNICOM/CTAF: Used at airports without control towers
Frequency Ranges
- VHF Band: 118.000 - 136.975 MHz
- Emergency: 121.5 MHz (International emergency frequency)
- Ground Control: Usually 121.6 - 121.9 MHz
- ATIS: Usually 108 - 118 MHz
- UNICOM: Typically 122.8 MHz (uncontrolled airports)
Navigation Aids (Navaids)
Navigation aids are electronic systems that help pilots determine their position and navigate safely. Here are the main types:
Types of Navaids
- VOR (VHF Omnidirectional Range): Provides bearing information to aircraft
- DME (Distance Measuring Equipment): Gives slant-range distance to the station
- NDB (Non-Directional Beacon): Simple radio beacon for basic navigation
- TACAN (Tactical Air Navigation): Military version of VOR/DME
- VORTAC: Combined VOR and TACAN facility
Usage Types & Power Levels
- HI: High altitude navigation
- LO: Low altitude navigation
- TERM: Terminal area navigation
- Power Levels: HIGH, MEDIUM, LOW (affects range)
- RNAV: Area navigation capability
Important Notes
- Always verify frequencies and navaid status in current aviation publications
- Magnetic variation changes over time and should be considered when using navaids
- Some navaids may be out of service or have limited hours of operation
- DME distances are slant-range and may differ from actual ground distance