GOES Satellite Transmitter Test Set

P/N: TS-101-GOES

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.

Complete Certification Test Set Up

The GDTx-TS provides a host of analysis information, which is presented both in text and in graphics.  The screen shot above shows the received symbol information presented in a polar graphical format. The screen shot on the left from the GUI shows a received message and the signal analysis. 
·     Frequency offset from the channel center to 0.1 Hertz.
·     Power measurements made on the carrier and on the individual symbols are  in dBm  EIRP to 0.01 dB. 
·     Information on all 8 phases is shown to 0.01 degrees. 
·     The time of reception of the various message format points is shown to the nearest millisecond. 
·     Symbol rate measured to 0.0001 Hertz Both the text and the graphical analysis information can be captured in a hard copy report


Operating Modes: GOES 100, 300, 1200 BPS.

All GOES Message Formats

Power Measurement:  < 0.25 dB

Power Input, High power:  25 watts

Power Input Low Power :  -10 dBm to -80 dBm

Frequency:   Full GOES channel range and may be expanded with firmware updates.

Frequency Resolution:  ±0.1 Hz

Frequency Accuracy:   ±1 Hz

Frequency Stability:  ±10 Hz per year uncorrected

GPS Input:  Time to 100 uS accuracy and ±1 millisecond  resolution.

Phase:  To ±0.01 degrees

Symbol Rate:  To ±0.0001 Hz (1000 symbol message minimum)

Standard Lab Operation Includes

200 - 300C for Certification MeasurementsAC / DC Power Supply ,

110 VDCN Type High Power Input

Low Power Input 1/4 Wave rubber whip antenna

Terminal Mode Menu Operation

PC GUI Operation and reports

IRIG-B Time Reference Input (Available from laboratory Time Standards such as available from True Time) 

Optional Internal Portable GPS Integral GPS Receiver

External GPS Bullet Antenna with 50 feet of low loss cable

External Magnetic Mount Patch Antenna with 16 feet of cable

12.6V DC Vehicle power source cable and connector.






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