The Guam Remote Ground Terminal (GRGT) is the replacement for the GRO Remote Terminal System (GRTS). GRTS, located and operated from near Canberra Australia closed the TDRSS Zone of Exclusion for the Compton Gamma Ray Observatory and the Space Shuttle. Implementation of the GRGT has extended that capability to all TDRSS customer thus making TDRSS capable of providing 100% coverage to all our customers. GRTS was taken out of operation when GRGT became fully operational in July 1998

The Design of GRGT included building a remotely operated ground terminal in Guam and equipping it with an SGLT identical to those at the WSC. GRGT operates with the  TDRS stationed at 275^oW longitude. Service from GRGT is scheduled via the DSMC as a normal TDRS support.

GRGT is located at the Naval Computer and Telecommunications Area and Master Station (NCTAMS) Receiver Site and includes an SGLT, an 11 meter antenna, and an End-to End test, 4.5 meter antenna. GRGT provides an S and Ku-band TDRS TT&C link; 2 S-band Single Access forward and return links and 2 Ku-band Single Access forward and return links. This includes all S and Ku-band Shuttle modes except mode 2 (Frequency Modulated) and Channel 3 analog data. The SGLT also supports one multiple access forward service and 2 MA returns (one of which will be used for periodic MA system calibration) The table below provides a summary of the services which are provided by the GRGT:

GRGT Service Summary

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