Appendix I

Station Classes

I-1. Stations (Alphabetical by Classes)

Station and associated station class (STC) symbols are required for all frequency requests and assignments. Station classes are used to identify the service in which the transmitting station will operate.

All classes of earth stations are fixed earth stations except--

• Those which have the following letters suffixed to the STC symbol:

A The earth station is aboard an aircraft.

L The earth station is on a land vehicle.

S The earth station is on board a ship.

M The earth station is on any two or all three of the above.

• Those with the following STC symbols:

TG A Maritime Mobile-Satellite Earth Station.

TJ An Aeronautical Mobile-Satellite Mobile Earth Station.

TO An Aeronautical Radionavigation-Satellite Mobile Earth Station.

TQ A Maritime Radionavigation-Satellite Mobile Earth Station.

TU A Land Mobile-Satellite Mobile Earth Station.

The suffix R shall be added to the established STC symbol only if the station is used primarily as a repeater in the bands shown below. For this purpose, a repeater consists of a radio transmitter, a radio receiver, and coupling between the two so as to retransmit unchanged in intelligence the received signal.

• 29.89-50.00 MHz (Exclusive Government Bands)
• 138.00-144.00 MHz
• 148.00-149.90 MHz
• 150.05-150.80 MHz
• 162.00-174.00 MHz
• 406.10-420.00 MHz

The STC symbols shown below are used on US government frequency assignments as applicable. Definitions followed by (RR) come from the ITU RR, 1982 edition.

FAB Aeronautical Broadcast Station: An aeronautical station which makes scheduled broadcasts of meteorological information and notices to airmen. (In certain instances, an aeronautical broadcast station may be placed on board a ship.)

AX Aeronautical Fixed Station: A station in the aeronautical fixed service. (RR)

RLA Aeronautical Marker Beacon Station: A radionavigation land station in the aeronautical radionavigation service which employs a marker beacon.

TB Aeronautical Mobile-Satellite Earth Station: A fixed earth station in the aeronautical mobile-satellite service. (RR)

TJ Aeronautical Mobile-Satellite Mobile Earth Station: A mobile earth station in the aeronautical mobile-satellite service. (RR)

EJ Aeronautical Mobile-Satellite Space Station: A space station in the aeronautical mobile-satellite service.

RLB Aeronautical Radiobeacon Station: A radiobeacon station in the aeronautical radionavigation service intended for the benefit of aircraft.

TZ Aeronautical Radionavigation-Satellite Earth Station: A fixed earth station in the aeronautical radionavigation-satellite service.

TO Aeronautical Radionavigation-Satellite Mobile Earth Station: A mobile earth station in the aeronautical radionavigation-satellite service. (RR)

EO Aeronautical Radionavigation-Satellite Space Station: A space station in the aeronautical radionavigation-satellite service. (RR)

FA Aeronautical Station: A land station in the aeronautical mobile service. In certain instances, an aeronautical station may be located, for example, on board ship or on a platform at sea. (RR)

FLEA Aeronautical Telemetering Land Station: A telemetering land station used in the flight testing of manned or unmanned aircraft, missiles, or major components thereof.

MOEA Aeronautical Telemetering Mobile Station: A telemetering mobile station used in testing of manned or unmanned aircraft, missiles, or major components thereof.

FLU Aeronautical Utility Land Station: A land station located at airdome control towers and used for control of ground vehicles and aircraft on the ground at airdromes.

MOU Aeronautical Utility Mobile Station: A mobile station used for communication at airdromes with the aeronautical utility land station, the airdrome control station, the Federal Aviation Administration flight service station, ground vehicles, and aircraft on the ground. (All transmissions shall be subject to the control of the airdrome control station and shall be discontinued immediately when so requested by the airdrome control operators.)

MA Aircraft Station: A mobile station in the aeronautical mobile service, other than a survival craft station, located on board an aircraft. (RR)

FAC Airdrome Control Station: An aeronautical station providing communication between an airdrome control tower and aircraft.

ROA Altimeter Station: A radionavigation mobile station in the aeronautical radionavigation service which employs a radio altimeter.

FB Base Station: A land station in the land mobile service. (RR)

EB Broadcasting-Satellite Space Station (sound broadcasting): A space station (sound broadcasting) in the broadcasting-satellite service. (RR)

EV Broadcasting-Satellite Space Station (television): A space station (television) in the broadcasting-satellite service. (RR)

BC Broadcasting Station (sound): A station (sound) in the broadcasting service. (RR)

BT Broadcasting Station (television): A station (television) in the broadcasting service. (RR)

FC Coast Station: A land station in the maritime mobile service. (RR)

TW Earth Exploration-Satellite Earth Station: An earth station in the earth exploration-satellite service. (RR)

EW Earth Exploration-Satellite Space Station: A space station in the earth exploration-satellite service. (RR)

TP Earth Station (receiving): An earth station used for receiving. (RR) (TP is not used on applications.)

TE Earth Station (transmitting): An earth station used for transmitting. (RR) (TE is not used on applications.)

XM Experimental Composite Station: An experimental station used in experimental operations of a complex nature not readily specified or used in operation which is a composite of two or more of the established experimental categories.

XC Experimental Contract Developmental Station: An experimental station used for the evaluation or testing under government contract of electronics equipment or systems in a design or development stage.

XD Experimental Developmental Station: An experimental station used for evaluation or testing of electronics equipment or systems in a design or development stage.

XE Experimental Export Station: An experimental station intended for export and used for the evaluation or testing of electronics equipment or systems in the design or development stage.

XR Experimental Research Station: An experimental station used in basic studies concerning scientific investigations looking toward the improvement of the art of radiocommunications.

EX Experimental Station: A station utilizing radio waves in experiments with a view to the development of science or technique. This definition does not include amateur stations. (RR) (EX is not used on applications.)

XT Experimental Testing Station: An experimental station used for the evaluation or testing of electronics equipment or systems, including site selection and transmission path surveys, which have been developed for operational use.

TC Fixed-Satellite Earth Station: An earth station in the fixed-satellite service. (RR)

EC Fixed-Satellite Space Station: A space station in the fixed-satellite service. (RR)

FX Fixed Station: A station in the fixed service. (RR)

FLEB Flight Telemetering Land Station: A telemetering land station the emissions of which are used for telemetering to a balloon; to a booster or rocket, excluding a booster or rocket in orbit about the earth or in deep space; or to an aircraft, excluding a station used in the flight testing of an aircraft.

MOEB Flight Telemetering Mobile Station: A telemetering mobile station the emissions if which are used for telemetering from a balloon; from a booster or rocket, excluding a booster or rocket in orbit about the earth or in deep space; or from an aircraft, excluding a station used in the flight testing of an aircraft.

FAT Flight Test Station: An aeronautical station used for the transmission of essential communications in connection with the testing of aircraft or major components of aircraft.

RLG Glide Path (Slope) Station: A radionavigation land station in the aeronautical radionavigation service which employs the Instrument Landing System Glide Path.

FXH Hydrologic and Meteorological Fixed Station: A fixed station the emissions of which are used for the automatic transmission of either hydrologic or meteorological data, or both.

FLH Hydrologic and Meteorological Land Station: A land station the emissions of which are used for the automatic transmission of either hydrologic or meteorological data, or both.

MOH Hydrologic and Meteorological Mobile Station: A mobile station the emissions of which are used for the automatic transmission of either hydrologic or meteorological data, or both.

ES Intersatellite Space Station: A space station in the intersatellite service. (RR)

TY Land Mobile-Satellite Earth Station: A fixed earth station in the land mobile-satellite service. (RR)

TU Land Mobile-Satellite Mobile Earth Station: A mobile earth station in the land mobile-satellite service. (RR)

EU Land Mobile-Satellite Space Station: A space station in the land mobile-satellite service. (RR)

ML Land Mobile Station: A mobile station in the land mobile service capable of surface movement within the geographical limits of a country or continent. (RR)

FL Land Station: A station in the mobile service not intended to be used while in motion. (RR)

RLL Localizer Station: A radionavigation land station in the aeronautical radionavigation service which employs an Instrument Landing System Localizer.

RLN Loran Station: A long distance radionavigation land station transmitting synchronized pulses. Hyperbolic lines of position are determined by the measurement of the difference in the time of arrival of these pulses.

FCB Marine Broadcast Station: A coast station which scheduled broadcasts of time, meteorological, and hydrographic information.

RLM Maritime Radiobeacon Station: A radiobeacon station in the maritime radionavigation service intended for the benefit of ships.

TI Maritime Mobile-Satellite Earth Station: An earth station in the maritime mobile-satellite service at a specified fried point. (RR)

TG Maritime Mobile-Satellite Mobile Earth Station: A mobile earth station in the maritime mobile-satellite service. (RR)

EG Maritime Mobile-Satellite Space Station: A space station in the maritime mobile-satellite service. (RR)

TX Maritime Radionavigation-Satellite Earth Station: A fixed earth station in the maritime radionavigation-satellite service. (RR)

TQ Maritime Radionavigation-Satellite Mobile Earth Station: A mobile earth station in the maritime radionavigation-satellite service. (RR)

EQ Maritime Radionavigation-Satellite Space Station: A space station in the maritime radionavigation-satellite service. (RR)

WXD Meteorological Radar Station: A station in the meteorological aids service employing radar.

TM Meteorological-Satellite Earth Station: An earth station in the meteorological-satellite service. (RR)

EM Meteorological-Satellite Space Station: A space station in the meteorological-satellite service. (RR)

MO Mobile Station: A station in the mobile service intended to be used while in motion or during halts at unspecified points. (RR)

OE Oceanographic Data Interrogating Station: A station in the maritime mobile service the emissions of which are used to initiate, modify, or terminate functions of equipment directly associated with an oceanographic data station, including the station itself. (RR)

OD Oceanographic Data Station: A station in the maritime mobile service located on a ship, buoy, or other sensor platform the emissions of which are used for transmission of oceanographic data. (RR)

RLO Omnidirectional Range Station: A radionavigation land station in the aeronautical radionavigation service providing direct indication of the bearing (omnibearing) of that station from an aircraft.

MAP Portable Aircraft Station: A portable station operating in the aeronautical mobile service.

MLP Portable Land Mobile Station: A portable station operating in the land mobile service.

MOP Portable Mobile Station: A portable station operating in the mobile service.

MRP Portable Radiolocation Station: A portable station operating in the radiolocation service.

MSP Portable Ship Station: A portable station operating in the maritime mobile service.

RLC Radar Beacon (racon) Station: A station which employs a radar beacon (racon).

WXB Radar Beacon Precipitation Gage Station: A transponder station in the meteorological aids service, the emissions of which are used for telemetering.

RA Radio Astronomy Station: A station in the radio astronomy service. (RR) (This is always a receiving station.)

MOB Radio Beacon Mobile Station: A mobile station the emissions of which are used to determine its location.

TF Radiodetermination-Satellite Earth Station: A fixed earth station in the radiodetermination-service. (RR)

TL Radiodetermination-Satellite Mobile Earth Station: A mobile earth station in the radiodetermination-satellite service. (RR)

EF Radiodetermination-Satellite Space Station: A space station in the radiodetermination-satellite service. (RR)

RG Radio Direction-Finding Station: A radiodetermination station using radio direction-finding. (RR)

LR Radiolocation Land Station: A station in the radiolocation service not intended to be used while in motion. (RR)

MR Radiolocation Mobile Station: A station in the radiolocation service intended to be used while in motion or during halts at unspecified points. (RR)

RL Radionavigation Land Station: A station in the radionavigation service not intended to be used while in motion. (RR)

RLTM Radionavigation Land Test Station (Maintenance Test Facility): A radionavigation land station in the aeronautical radionavigation service which is used as a radionavigation calibration station for the transmission of essential information in connection with the testing and calibration of aircraft navigational aids, receiving equipment, and interrogators at predetermined surface locations. The primary purpose of this facility is to permit maintenance testing by aircraft radio service personnel.

RLTO Radionavigation Land Test Station (operational Test Facility): A radionavigation land station in the aeronautical radionavigation service which is used as a radionavigation calibration station for the transmission of essential information in connection with the testing and calibration of aircraft navigational aids, receiving equipment, and interrogators at predetermined surface locations. The primary purpose of this facility is to permit the pilot to check a radionavigation system aboard the aircraft prior to takeoff.

RO Radionavigation Mobile Station: A station in the radionavigation service intended to be used while in motion or during halts at unspecified points. (RR)

TN Radionavigation-Satellite Earth Station: An earth station in the radionavigation-satellite service. (RR)

EN Radionavigation-Satellite Space Station: A space station in the radionavigation-satellite service. (RR)

RLR Radio Range Station: A radionavigation land station in the aeronautical radionavigation service providing radial equisignal zones. (In certain instances a radio range station may be placed on board a ship.)

WXR Radiosonde Station: A station in the meteorological aids service employing a radiosonde.

WXRG Radiosonde Ground Station: A station in the meteorological aids service employing a ground station associated with a radiosonde.

MS Ship Station: A mobile station in the maritime mobile service located on board a vessel which is not permanently moored, other than a survival craft station. (RR)

SN Sounder Network Station: A station equipped with an ionosphere sounder used for the real-time selection of frequencies for operational communication circuits.

SP Sounder Prediction Station: A station equipped with an ionosphere sounder for real-time monitoring of upper atmosphere phenomena or to obtain data for the prediction of propagation conditions.

TT Space Operation Earth Station: An earth station in the space operation service. (RR)

ET Space Operation Space Station: A space station in the space operation service.

TH Space Research Earth Station: An earth station in the space research service. (RR)

EH Space Research Space Station: A space station in the space research service. (RR)

ME Space Station: A station located on an object which is beyond, is intended to go beyond, or has been beyond, the major portion of the earth's atmosphere. (RR) (ME is not used on applications.)

TD Space Telecommand Earth Station: An earth station the emissions of which are used for space telecommand. (RR)

ED Space Telecommand Space Station: A space station which receives emissions used for space telecommand. (RR)

TETD Space Telecommand Transmitting Earth Station: For an emergency position-indicating radiobeacon (EPIRB) in a mobile-satellite service.

TETR Space Telemetering Transmitting Earth Station: For an emergency position-indicating radiobeacon (EPIRB) in a mobile-satellite service.

TR Space Telemetering Earth Station: An earth station which receives emissions used for space telemetering. (RR)

ER Space Telemetering Space Station: A space station the emissions of which are used for space telemetering. (RR)

TK Space Tracking Earth Station: An earth station which transmits or receives emissions used for space tracking. (RR)

EK Space Tracking Space Station: A space station which transmits or receives and retransmits emissions used for space tracking. (RR)

TETK Space Tracking Transmitting Earth Station: For an emergency position-indicating radiobeacon (EPIRB) in a mobile-satellite service.

SS Standard Frequency and Time Signal Station: A station in the standard frequency and time signal service. (RR)

EE Standard Frequency and Time Signal-Satellite Space Station: A space station in the standard frequency and time signal-satellite service. (RR)

FLEC Surface Telemetering Land Station: A telemetering land station the emissions of which are intended to be received on the surface of the earth.

MOEC Surface Telemetering Mobile Station: A telemetering mobile station located on the surface of the earth and the emissions of which are intended to be received in the surface of the earth.

RLS Surveillance Radar Station: A radionavigation land station in the aeronautical radionavigation service employing radar to display the presence of aircraft within its range. (In certain instances, a surveillance radar station may be placed on board a ship.)

FAD Telecommand Aeronautical Station: A land station in the aeronautical mobile service the emissions of which are used for terrestrial telecommand.

MAD Telecommand Aircraft Station: A mobile station in the aeronautical mobile service the emissions of which are used for terrestrial telecommand.

FBD Telecommand Base Station: A land station in the land mobile service the emissions of which are used for terrestrial telecommand.

FCD Telecommand Coast Station: A land station in the maritime mobile service the emissions of which are used for terrestrial telecommand.

FXD Telecommand Fixed Station: A fixed station the emissions of which are used for terrestrial telecommand.

FLD Telecommand Land Station: A land station the emissions of which are used for terrestrial telecommand.

MLD Telecommand Land Mobile Station: A mobile station in the land mobile service the emissions of which are used for terrestrial telecommand.

MOD Telecommand Mobile Station: A mobile station the emissions of which are used for terrestrial telecommand.

MSD Telecommand Ship Station: A mobile station in the maritime mobile service the emissions of which are used for terrestrial telecommand.

FXE Telemetering Fixed Station: A fixed station the emissions of which are used for telemetering.

FLE Telemetering Land Station: A land station the emissions of which are used for telemetering.

MOE Telemetering Mobile Station: A mobile station the emissions of which are used for telemetering.

I-2. Stations (Alphabetical Symbols)

STC symbols shown below are used on US government frequency assignments as applicable.

AX Aeronautical Fixed Station.

BC Broadcasting Station (sound).

BT Broadcasting Station (television).

EB Broadcasting-Satellite Space Station (sound broadcasting).

EC Fixed-Satellite Space Station.

ECED Space Telecommand Space Station in the fixed-satellite service.

ECEK Space Tracking Space Station in the fixed-satellite service.

ECER Space Telemetering Space Station in the fixed-satellite service.

ED Space Telecommand Space Station.

EE Standard Frequency and Time Signal-Satellite Space Station.

EF Radiodetermination-Satellite Space Station.

EFED Space Telecommand Space Station in the radiodetermination-satellite service.

EFEK Space Tracking Space Station in the radiodetermination-satellite service.

EFER Space Telemetering Space Station in the radiodetermination-satellite service.

EG Maritime Mobile-Satellite Space Station.

EGED Space Telecommand Space Station in the maritime mobile-satellite service.

EGEK Space Tracking Space Station in the maritime mobile-satellite service.

EGER Space Telemetering Space Station in the maritime mobile-satellite service.

EH Space Research Space Station.

EHED Space Telecommand Space Station in the space research service.

EHEK Space Tracking Space Station in the space research service.

EHER Space Telemetering Space Station in the space research service.

EJ Aeronautical Mobile-Satellite Space Station.

EJED Space Telecommand Space Station in the aeronautical mobile-satellite service.

EJEK Space Tracking Space Station in the aeronautical mobile-satellite service.

EJER Space Telemetering Space Station in the aeronautical mobile-satellite service.

EK Space Tracking Space Station.

EM Meteorological-Satellite Space Station.

EMED Space Telecommand Space Station in the meteorological-satellite service.

EMEK Space Tracking Space Station in the meteorological-satellite service.

EMER Space Telemetering Space Station in the meteorological-satellite service.

EN Radionavigation-Satellite Space Station.

ENED Space Telecommand Space Station in the radionavigation-satellite service.

ENEK Space Tracking Space Station in the radionavigation-satellite service.

ENER Space Telemetering Space Station in the radionavigation-satellite service.

EO Aeronautical Radionavigation-Satellite Space Station.

EOED Space Telecommand Space Station in the aeronautical radionavigation-satellite service.

EOEK Space Tracking Space Station in the aeronautical radionavigation-satellite service.

EOER Space Telemetering Space Station in the aeronautical radionavigation-satellite service.

EQ Maritime Radionavigation-Satellite Space Station.

EQED Space Telecommand Space Station in the maritime radionavigation-satellite service.

EQEK Space Tracking Space Station in the maritime radionavigation-satellite service.

EQER Space Telemetering Space Station in the maritime radionavigation-satellite service.

ER Space Telemetering Space Station.

ES Intersatellite Space Station.

ESED Space Telecommand Space Station in the intersatellite service.

ESEK Space Tracking Space Station in the intersatellite service.

ESER Space Telemetering Space Station in the intersatellite service.

ET Space Operation Space Station.

ETED Space Telecommand Space Station in the space operation service.

ETEK Space Tracking Space Station in the space operation service.

ETER Space Telemetering Space Station in the space operation service.

EU Land Mobile-Satellite Space Station.

EUED Space Telecommand Space Station in the land mobile-satellite service.

EUEK Space Tracking Space Station in the land mobile-satellite service.

EUER Space Telemetering Space Station in the land mobile-satellite service.

EV Broadcasting-Satellite Space Station (television).

EW Earth Exploration-Satellite Space Station.

EWED Space Telecommand Space Station in the earth exploration-satellite service.

EWEK Space Tracking Space Station in the earth exploration-satellite service.

EWER Space Telemetering Space Station in the earth exploration-satellite service.

EX Experimental Station.

FA Aeronautical Station.

FAB Aeronautical Broadcast Station.

FAC Airdome Control Station.

FAD Telecommand Aeronautical Station.

FAT Flight Test Station.

FB Base Station.

FC Coast Station.

FCB Marine Broadcast Station.

FL Land Station.

FLD Telecommand Land Station.

FLE Telemetering Land Station.

FLEA Aeronautical Telemetering Land Station.

FLEB Flight Telemetering Land Station.

FLEC Surface Telemetering Land Station.

FLH Hydrologic and Meteorological Land Station.

FLU Aeronautical Utility Land Station.

FX Fixed Station.

FXD Telecommand Fixed Station.

FXE Telemetering Fixed Station.

FXH Hydrologic and Meteorological Fixed Station.

LR Radiolocation Land Station.

MA Aircraft Station.

MAD Telecommand Aircraft Station

MAP Portable Aircraft Station.

ME Space Station.

ML Land Mobile Station.

MLP Portable Land Mobile Station.

MO Mobile Station.

MOB Radiobeacon Mobile Station.

MOD Telecommand Mobile Station.

MOE Telemetering Mobile Station.

MOEA Aeronautical Telemetering Mobile Station.

MOEB Flight Telemetering Mobile Station.

MOEC Surface Telemetering Mobile Station.

MOH Hydrologic and Meteorological Mobile Station.

MOP Portable Mobile Station.

MOU Aeronautical Utility Mobile Station.

MR Radiolocation Mobile Station.

MRP Portable Radiolocation Station.

MS Ship Station.

MSD Telecommand Ship Station.

MSP Portable Ship Station.

OD Oceanographic Data Station.

OE Oceanographic Data Interrogating Station.

RA Radio Astronomy Station.

RG Radio Direction-Finding Station.

RL Radionavigation Land Station.

RLA Aeronautical Marker Beacon Station.

RLB Aeronautical Radiobeacon Station.

RLC Radar Beacon (racon) Station.

RLG Glide Path (Slope) Station.

RLL Localizer Station.

RLM Marine Radiobeacon Station.

RLN Loran Station.

RLO Omnidirectional Range Station.

RLR Radio Range Station.

RLS Surveillance Radar Station.

RLTM Radionavigation Land Test Station (Maintenance Test Facility).

RLTO Radionavigation Land Test Station (Operational Test Facility).

RO Radionavigation Mobile Station.

ROA Altimeter Station.

SN Sounder Network Station.

SP Sounder Prediction Station.

SS Standard Frequency and Time Signal Station.

TB Aeronautical Mobile-Satellite Earth Station.

TBTD Space Telecommand Earth Station (fixed) in the aeronautical mobile-satellite service.

TBTK Space Tracking Earth Station (fixed) in the aeronautical mobile-satellite service.

TBTR Space Telemetering Earth Station (fixed) in the aeronautical mobile-satellite service.

TC Fixed-Satellite Earth Station.

TCTD Space Telecommand Earth Station in the fixed-satellite service.

TCTK Space Tracking Earth Station in the fixed-satellite service.

TCTR Space Telemetering Earth Station in the fixed-satellite service.

TD Space Telecommand Earth Station.

TE Earth Station (transmitting).

TETD Telecommand Transmitting Earth Station for an EPIRB in a mobile-satellite service.

TETK Space Tracking Transmitting Earth Station for an EPIRB in a mobile-satellite service.

TETR Space Telemetering Transmitting Earth Station for an EPIRB in a mobile-satellite service.

TF Radiodetermination-Satellite Earth Station.

TFTD Space Telecommand Earth Station (fixed) in the radiodetermination-satellite service.

TFTK Space Tracking Earth Station (fixed) in the radiodetermination-satellite service.

TFTR Space Telemetering Earth Station (fixed) in the radiodetermination-satellite service.

TG Maritime Mobile-Satellite Mobile Earth Station.

TGTD Space Telecommand Earth Station (mobile) in the maritime mobile-satellite service.

TGTK Space Tracking Earth Station (mobile) in the maritime mobile-satellite service.

TGTR Space Telemetering Earth Station (mobile) in the maritime mobile-satellite service.

TH Space Research Earth Station.

THTD Space Telecommand Earth Station in the space research service.

THTK Space Tracking Earth Station in the space research service.

THTR Space Telemetering Earth Station in the space research service.

TI Maritime Mobile-Satellite Earth Station.

TITD Space Telecommand Earth Station (fixed) in the maritime mobile-satellite service.

TITK Space Tracking Earth Station (fixed) in the maritime mobile-satellite service.

TITR Space Telemetering Earth Station (fixed) in the maritime mobile-satellite service.

TJ Aeronautical Mobile-Satellite Mobile Earth Station.

TJTD Space Telecommand Earth Station (mobile) in the aeronautical mobile-satellite service.

TJTK Space Tracking Earth Station (mobile) in the aeronautical mobile-satellite service.

TJTR Space Telemetering Earth Station (mobile) in the aeronautical obile-satellite service.

TK Space Tracking Earth Station.

TL Radiodetermination-Satellite Mobile Earth Station.

TLTD Space Telecommand Earth Station (mobile) in the radiodetermination-satellite service.

TLTK Space Tracking Earth Station (mobile) in the radiodetermination-satellite service.

TLTR Space Telemetering Earth Station (mobile) in the radiodetermination-satellite service.

TM Meteorological-Satellite Earth Station.

TMTD Space Telecommand Earth Station in the meteorological-satellite service.

TMTK Space Tracking Earth Station in the meteorological-satellite service.

TMTR Space Telemetering Earth Station in the meteorological-satellite service.

TN Radionavigation-Satellite Earth Station.

TNTD Space Telecommand Earth Station in the radionavigation-satellite service.

TNTK Space Tracking Earth Station in the radionavigation-satellite service.

TNTR Space Telemetering Earth Station in the radionavigation-satellite service.

TO Aeronautical Radionavigation-Satellite Mobile Earth Station.

TOTD Space Telecommand Earth Station (mobile) in the aeronautical radionavigation-satellite service.

TOTK Space Tracking Earth Station (mobile) in the aeronautical radionavigation-satellite service.

TOTR Space Telemetering Earth Station (mobile) in the aeronautical radionavigation-satellite service.

TP Earth Station (receiving).

TQ Maritime Radionavigation-Satellite Mobile Earth Station.

TQTD Space Telecommand Earth Station (mobile) in the maritime radionavigation-satellite service.

TQTK Space Tracking Earth Station (mobile) in the maritime radionavigation-satellite service.

TQTR Space Telemetering Earth Station (mobile) in the maritime radionavigation-satellite service.

TR Space Telemetering Earth Station.

TT Space Operation Earth Station.

TTTD Space Telecommand Earth Station in the space operation service.

TTTK Space Tracking Earth Station in the space operation service.

TTTR Space Telemetering Earth Station in the space operation service.

TU Land Mobile-Satellite Mobile Earth Station.

TUTD Space Telecommand Earth Station (mobile) in the land mobile-satellite service.

TUTK Space Tracking Earth Station (mobile) in the land mobile-satellite service.

TUTR Space Telemetering Earth Station (mobile) in the land mobile-satellite service.

TW Earth Exploration-Satellite Earth Station.

TWTD Space Telecommand Earth Station in the earth exploration-satellite service.

TWTK Space Tracking Earth Station in the earth exploration-satellite service.

TWTR Space Telemetering Earth Station in the earth exploration-satellite service.

TX Maritime Radionavigation-Satellite Earth Station

TXTD Space Telecommand Earth Station (fixed) in the maritime radionavigation-satellite service.

TXTK Space Tracking Earth Station (fixed) in the maritime radionavigation-satellite service.

TXTR Space Telemetering Earth Station (fixed) in the maritime radionavigation-satellite service.

TY Land Mobile-Satellite Earth Station.

TYTD Space Telecommand Earth Station (fixed) in the land mobile-satellite service.

TYTK Space Tracking Earth Station (fixed) in the land mobile-satellite service.

TYTR Space Telemetering Earth Station (fixed) in the land mobile-satellite service.

TZ Aeronautical Radionavigation-Satellite Earth Station.

TZTD Space Telecommand Earth Station (fixed) in the aeronautical radionavigation-satellite service.

TZTK Space Tracking Earth Station (fixed) in the aeronautical radionavigation-satellite service.

TZTR Space Telemetering Earth Station (fixed) in the aeronautical radionavigation-satellite service.

WXB Radar Beacon Precipitation Gage Station.

WXD Meteorological Radar Station.

WXR Radiosonde Station.

XC Experimental Contract Developmental Station.

XD Experimental Developmental Station.

XE Experimental Export Station.

XM Experimental Composite Station.

XR Experimental Research Station.

XT Experimental Testing Station.

I-3. Services, Station Classes, and Stations

Use Table I-1 to determine the proper STC symbol to use versus the service in which the transmitting station will operate. Frequency bands are allocated to services based on the US Government Table of Frequency Allocations.

I-4. Spectrum Designation of Frequency

Table I-2 shows that spectrum designation of frequency is a method of referring to a range or band of communications frequencies. In America, the designator is a two-or three-letter abbreviation for the name. In the ITU, the designator is numeric.

NOTE: The eight microwave frequency bands designated by the letters C, L, S, X, K, Q, V, and W represent the frequency ranges from 225 MHz to 100 GHz. They describe radar bands that have no official status and should not be used.