TELEMETRIX 400 MODULATOR/RECEIVER SYSTEM (T400XR)
OVERVIEW
 The RT Logic Telemetrix® 400XR (T400XR) is a modular, software-defined modulator, receiver, and digital processing unit. The systems flexible architecture allows the T400XR to support many different mission configurations. Software-defined waveform processing allows the T400XR to be used as a replacement for legacy receiver models or for new applications. Multi-channel configurations enable capabilities such as diversity combination or multiple simultaneous downlinks and uplinks. The unit is also available in an economical one-channel configuration. External interfaces include RF, 70 MHz IF, baseband, command and telemetry data, and Ethernet control.
APPLICATION
 The T400XR is well suited for satellite ground station and satellite test applications. The standard packaging is a 2U high, 19 rack-mount unit capable of hosting multiple downconverters, upconverters, and modulators/demodulators. 5U and 1U chassis configurations are also available. Redundant power supplies are available for the 2U and 5U versions.

The highly modular and flexible architecture allows the T400XR to be easily customized for single-stream or multi-stream applications, with customer-selected test points and test functions. All signal processing is performed in software and Field-Programmable Gate Array (FPGA) firmware, so new customized processing can easily be added. The T400XR signal processing engine is the RT Logic DTR-70 card. Supported modes include SGLS, USB (STDN), and TDRSS. PSK, PM, FM, and custom waveforms are also supported.

The T400XR can be controlled and monitored through a built-in front panel interface, through the local RT Logic Java GUI, or over the Ethernet. The RT Logic Java GUI can also be run over the Ethernet from any standard computer. An Application Programming Interface (API) is available for network-based control and status from a host application.
FEATURES
RF Front End (Downlink and Uplink)
  • RF: L Band & S-Band, Others Bands Optional
  • IF: 70 MHz 20 MHz
  • Baseband
Demodulation
  • SGLS, USB, TDRSS, And Others
  • Spread Spectrum: TDRSS Formats
  • Subcarrier Demodulation
  • Convolutional, R-S Decoding
  • Bit Synchronization
 Modulation/Commanding
  • SGLS, USB, TDRSS, And Others
  • Spread Spectrum: TDRSS Formats
  • Analog Input: FM/PM/AM
  • Convolutional, R-S Encoding
Ranging
  • SGLS PRN, USB Tone, TDRSS
Diversity Combination

Spectral Display, I/Q Vector Plot


BLOCK DIAGRAM


SPECS
S/L Band Agile Downconverter
  • Input Frequency: 1700 To 2300 MHz
  • Output Frequency: 70 MHz
  • Gain: 30 dB
  • Noise Figure: 12 dB
  • Output Compression Point: 8 dBm
Intermediate Frequency Processing
  • IF Input Frequency: 50 MHz To 90 MHz
  • Tuning Resolution: < 0.1 Hz
  • IF Input Power Level: < -60 dBm To +10 dBm
  • Acquisition Range: 1 MHz
  • Maximum Doppler Range: < 10 kHz/sec
Demodulation
  • Direct PSK (BPSK/QPSK/OQPSK/UAQPSK)
  • Symbol Rates: Up To 30 Msps
  • Subcarrier BPSK/QPSK
  • Convolutional, R-S Decoding
  • Subcarrier Frequency: 1 kHz To 20 MHz
  • Bit Synchronization, Decoding (PCM Code Processing, I/Q Re-Interleaving, Derandomization)
  • Spread Spectrum: TDRSS Format, Others
Command Generator/Modulator
  • SGLS/USB Commanding, Echo Check
  • Output Frequency: 50 MHz To 90 MHz
  • IF Output Level: -40 dBm To 0 dBm
  • Subcarrier BPSK (USB)
Modulation
  • Direct PSK (BPSK/QPSK/OQPSK/UAQPSK)
  • 2 Subcarriers: SGLS/USB
  • PM, FM, FSK/AM
  • Convolutional, R-S Encoding
  • Subcarrier Frequency: 1 kHz To 20 MHz
  • Analog Input: FM/PM/AM
  • Spread Spectrum: TDRSS Format, Others
Ranging
  • SGLS PRN Ranging
  • USB Tone Ranging
  • TDRSS Ranging
 I/O
  • Baseband Input/Output
  • I/F Input/Output
  • L/S-Band Input/Output
  • I/Q Channel Data & Clock Output (TTL Or RS-422)
  • Ternary/Binary Command Data & Clock Input
  • (TTL Or RS-422)
  • Simulated Telemetry Data & Clock Input
  • (TTL Or RS-422)
  • SLE, Ethernet Data Packets
S/L Band Agile Upconverter
  • Input Center Frequency: 70 MHz
  • Output Frequency: 1700 MHz To 2300 MHz
  • IF Bandwidth: 35 MHz
  • Gain: 5 dB
  • Output Compression Point: +10 dBm
Frequency Reference
  • External 5 MHz Or 10 MHz, Or Internally Generated
Master Processor Board
  • Intel Pentium-Based CPU
  • Real-Time Linux OS
  • 10/100 Mbps Ethernet
  • Multiple Storage Options
Control and Monitoring
  • Front-Panel Keypad For Parameter
  • Input/Modification
  • Front-Panel LED Status Indicators
  • Local Monitor (Optional)
  • Ethernet TCP/IP Remote M&C Interface
  • Java-Based GUI And Client Objects
Operating Environment
  • 0 C To 50 C
  • 10% To 90% Relative Humidity
Mechanical
  • 1U, 2U, Or 5U 19 Rack-Mount Unit