The purpose of the Model GDTx-TS GOES DCS Transmitter Test Set is to allow users to perform operational tests and analyses on the signals transmitted from GOES DCP’s. The GDTx-TS may also be used with related satellite systems such as GMS and METEOSAT. The Microcom GDTx-TS is the commercial version of the NOAA GOES Certification Test Set used for all DCP certification. The Test Set is based on the same DSP technolgy as used in the NOAA Wallops CDAS DAPS receive system. DSP technology allows software updates to the Test Set permitting changes in both the user interface and message demodulation. This provides the ability to adapt the Test Set to changes in GOES message formats and allows future enhancements for use with other satellite systems such as ARGOS, SCD, and INSAT.The GDTx-TS may be applied to four operating modes and applications :
· DCPRS certification preparation
· Lab or depot maintenance and repair
· Field trip preparation
· Field operational checks and verification
In the certification test application, all certification parameters except spectra are measured. For lab or maintenance work, performance may be verified after repair. In field work, signals may be received directly from the transmit antenna by using the low power 402 MHz input with supplied antenna.
Although the GDTx-TS may be operated using its RS-232 Terminal Menu System, a GUI is supplied that provides simple controls and many displays. The figure below shows the GUI's main application screen.
The Transmitter Power section shows the real time display of received power at 402 MHz and the power measured at the demodulator. The IF gain control is used to match the demodulator power to that which would be received by NOAA for the antenna used. The left hand section provides controls for selecting operating mode, channel, and data rate for the Test Set.
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