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Telemetry and Communications: Chassis Level Solutions
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Satellite Telemetry and Communications RF Exciter & Test Signal Simulator
Quad-Band Multi-Mission Integrated Solution for Legacy and High Data Rate Applications
- Waveform Modulator, RF Exciter, Noise Generator, Upconverter, BERT
- Single or Dual-Output Quad-Band RF Exciter:
Baseband
Lower L-Band
Upper L-Band
Transmit & Receive S-Band
- Digital or Complex Waveform Modulator
- Data Rates up to 50 Mbaud or 100 Mbps
- Data Encoder with PCM, Convolutional, and Scrambling
- Includes External I/Q Inputs for Optional Direct Vector Modulation
- Selectable Internal BPSK, QPSK, UQPSK, AQPSK, OQPSK, 8-PSK, and 16-PSK Waveform Generation
- Programmable Satellite Acquisition Sweep/Decay, Fade, Doppler Sweep Rate and Range
- Dual configurable AWG Noise, PN Generators and BER Testers for Accurate Eb/No and SNR Simulation
- Compact 2U Chassis Replaces Separate Noise Source, Upconverter, Amplifier, BERT and Hours of Calibration
- NO HARD DRIVE OR OPERATING SYSTEM REQUIRED!
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The SE-4255 Quad-Band HDR RF Exciter & Test Signal Simulator combines a state-of-the-art high data rate digital wideband waveform modulator with a high performance radio frequency (RF) upconverter to produce transmission-ready signals in the Baseband, Upper L-, Lower L-, and both Transmit and Receive S-Band frequency bands. An advanced, digital implementation provides for the small form and fit while fully satisfying applications requiring ruggedized packaging, minimum power consumption, and high spectral purity. The design supports a multitude of complex digital formats.
Data generation, coding, and modulation can be driven from a variety of external digital inputs or via internal pattern and waveform generation sources. Dual data processing paths are included to allow creation of independent I and Q data coding.
A single SE-4255 can replace a BERT, waveform generator, vector modulator, upconverter, amplifier, noise source, attenuators, power meter, spectrum analyzer and a frequency converter. Combining these capabilities in one small, simple-to-use unit allows quick and accurate setup and testing without in-depth system knowledge.
The practical design of the SE-4255 Exciter also supports link test and verification applications by providing dual channel bit-error-rate testing functions as well as simulated noise insertion for ground station loopback testing. An optional second, independently tunable modulated RF output may be used effectively with dual-polarized systems. Output power levels are adjustable from +10 dBm to -80 dBm in 0.1 dB steps for fine control and fade profiling.
Configurable front panel BNC connectors provide operators with ready access to internal operating signals. The SE-4255 can also optionally support a station clock input for external frequency reference. The SE-4255 also includes support for user-configurable Doppler simulation and satellite acquisition automation functions.
The firmware-intensive implementation of the SE-4255 readily accommodates custom features and signal processing tasks. Using the latest generation digital signal processing techniques allows upgrades via firmware changes, even for previously fielded systems.
Up to 32 Configuration Profiles can be stored with user-defined link names and recalled with a single command.
The SE-4255 RF Exciter is implemented in an industry standard 19 inch rack mountable chassis and provides full status and control capabilities. Controllable selections are accessible via a front-panel display or remotely via a standard RS-232 serial and 10/100baseT Ethernet or optional GPIB interface.
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Data Input
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2 TTL Data/Clocks: 50 bps to 20 Mbps
2 Differential Data/Clocks: 50 bps to 50 Mbps (SE-4250 to 20)
2 Internal Digital Pattern Generators
2 Internal Clock Generators (With Outputs)
External I/Q Inputs to Vector Modulator
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Coding Formats
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PCM:
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NON-RETURN-TO ZERO (NRZ)
- Mark (NRZ-M)
- Space (NRZ-S)
- Level (NRZ-L)
BI-PHASE (BIØ)
- Mark (BIØ-M)
- Space (BIØ-S)
- Level (BIØ-L)
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Convolutional:
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Bypass Control to Disable
Rate 1/2 or Rate 3/4 (Punctured)
Constraint Length 7,
Industry Standard Polynomials
G1/G2, G1/-G2, G2/G1, -G2/G1 Symbol Ordering
Dual Encoder Mode for Quad Modulations
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Scrambling:
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Bypass, Intelsat (V.36), or CCITT (V.35)
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Primary RF
Output
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Frequency:
1400 to 2600 MHz
Continuously Tunable
Frequency Resolution: 1 Hz
Modulation Options:
Unmodulated CW
Digital Modulation
Output Level: +10 to -80 dBm or OFF
Step Size: 0.1 dB
Spurious:
>-60 dBc to 1 MHz (typical)
>-70 dBc >1 MHz
Phase Noise: <-85 dBHz at 10 KHz offset
Programmable Sweep and Frequency Decay:
Sweep Range: Up to ±20 MHz
Sweep/Decay Rate: 10 Hz to 1 MHz/sec.
Sweep Control:
Up, Down, Bi-Directional
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Secondary RF
Output (Optional)
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Frequency:
1400 to 2600 MHz
Continuously Tunable
Characteristics: Identical to Primary RF Output
Modulation Options:
Unmodulated CW
Modulated with Primary Waveform
Output Level: +10 to -80 dBm or OFF
Step Size: 1 dB
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Supported Waveforms
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Digital:
Phase Shit Keyed (PSK)
Frequency Shift Keyed (FSK) (SE-4250 Only)
Amplititude Shit Keyed (ASK) (SE-4250 Only)
Analog (SE-4250 Only):
Phase Modulation (PM)
Frequency Modulation (FM)
Amplititude Modulation (AM)
Modulation Options:
PM/PSK
FM/FSK
FM/FM
Others: Consult Factory
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PM or PSK Waveform Specifications
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Digital Modes:
BPSK, QPSK, AQPSK, UQPSK, OQPSK (Standard)
DPM (SE-4250 Only)
Shaping: Phase Transition over 0 to 100% of Baud Period
Modulation Rates (SE-4250):
100 bps to 10 Mbps
Modulation Rates (SE-4255):
32 K to 50 Mbaud
- or-
32 K to 100 Mbps
Mod Indices:
0 to 180° for DPM (SE-4250 Only)
Adjustable I/Q power ratios for A or UQPSK
Analog Modes (SE-4250 Only): Externa In, Digital Modulator In
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FM or FSK Waveform
Specifications (SE-4250)
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Mode: Binary FSK
Analog Modes: External In, Digital Modulator In
Modulation Rates: 100 sps to 10 Mbps or Up to 12 MHz Anlg
Deviation: 200 Hz to 12 MHz
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AM or ASK Waveform Specifications (SE-4250)
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Sigital Mode: Binary ASK or OOK
Analog Modes: External In, Digital Modulator In
Modulation Rates: 100 sps to 10 Msps or up to 10 MHz Anlg
Mod Inces: 0.1 to 100% in .1% Increments
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Additional Features |
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Baseband RF Output: 0-100 MHz
Bit-Error-Rate Testing: Monitors Bit Error Rate for Returned
Data of Internally Generated Data Patterns
AWGN Noise Generator: Adds Simulated AWGN to Output
Waveform to Establish Accurate Eb/No Levels
Dual PN Code Generators for Industry Standard Patterns
Bit-Synchronizer: Auto-baud detect to adapt shaped
waveform
and/or Modulation Indicies
Up to 32 Stored Configuration Profiles
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Remote Status/Control
Specifications
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Serial RS-232, 10/100baseT Ethernet
LAN(GPIB Optional)
Commands:
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Control Over All Configurable Parameters
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Status:
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Self-Test Status
Auto-baud Detect
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Other Specifications
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Chassis
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19 Inch Rack Mountable
3.5 Inch Height (2U)
22.5 Inch Depth (Excluding Handles/Connectors)
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Connectors
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1 Type N for Primary RF Output
1 Type N for Secondary RF Output (Option)
2 BNC'S for Monitor Ports (Front Panel)
6 BNC’S For Data/Clock Inputs/Outputs
1 25 PIN D for Differential Data/Clock Inputs/Outputs
1 BNC for External Reference Input (Option)
1 BNC for Internal Reference Output (Option)
1 9 PIN D for Remote Status/Control
RJ-45 for 10/100baseT
GPIB (Option, replaces 10/100baseT)
Standard 3 Prong Male Primary Power Input
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Prminary Power:
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120 VAC (+/- 10%)
50-60 Hz
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Temperature
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-25° TO 60° C Operational
-45° TO +65° C Storage
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Humidity: To 95% non-condensing
Altitude:
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15,000 feet AMSL (Operational)
50,000 feet AMSL (Storage)
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Click to Contact Us for more information on our products and services.
* All specifications subject to change without
notice or obligation to retrofit.
Consult factory for custom options and/or alternate specifications
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