BPSK Subcarrier Modem - Model 780M - GDP Space Systems - Telemetry Systems, Synchronizers, BERTS, Demodulaters, Modulators, Receivers, Frame Synchronizers, decommutator, Simulators

The Model 780M PSK Subcarrier Modem provides BPSK subcarrier modulation and demodulation in a single 3.5 inch high, 19 inch rack mount chassis.

The 780M provides non-coherent modulation of a subcarrier by an input data stream. An internal PSK demodulator and bit synchronizer provides a path for data and clock output. The ability to support differential coding adds flexibility to the spacecraft commanding system.

Features

Independent Modulator and Demodulator
Tunable Modulated Subcarrier 1 kHz to 2 MHz
Data Rates to 250 kbps

True BPSK Modulation
RS232 Remote Control
High Contrast VF Display

All functions within the 780M are microprocessor controlled from either the front panel or the RS232 remote control port with the exception of the PSK modulator output level which is controlled by a front panel potentiometer. The Processor provides an interactive, menu-driven front panel user interface or accepts formatted ASCII string from the RS232 remote control port.

The Modulator section accepts TTL or RS422 command data and clock, provides decoding and encoding of the input, then BPSK modulates a selectable frequency subcarrier. The resulting output is a sine wave. The subcarrier frequency is tunable from 1 kHz to 2 MHz.

The demodulator/bit synchronizer section has two selectable inputs. A BPSK modulated subcarrier is acquired and the recovered baseband signal from the demodulator is passed to the bit synchronizer, where clock is recovered from the baseband data. Data and clock are provided as both TTL and RS422. Differential decoding and encoding of the recovered baseband data is provided.

Applications

The Model 780M supports a wide variety of applications encompassing testing through TT&C link support. While testing a data link, the unit allows the up-link is to be dynamically monitored. The up-link is generated by the modulator section and the wrapped around signal is monitored by the demodulator/bit synchronizer section.

The Modulator and the Demodulator/Bit Synchronizer sections are independent of each other and user selectable parameters are controlled separately via the front panel, or the remote control interface. Therefore, the unit is ideally suited for TT&C applications.


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The Model 780M PSK Subcarrier Modem provides BPSK subcarrier modulation and demodulation in a single 3.5 inch high, 19 inch rack mount chassis. The 780M provides non-coherent modulation of a subcarrier by an input data stream. An internal PSK demodulator and bit synchronizer provides a path for data and clock output. The ability to support differential coding adds flexibility to the spacecraft commanding system.
Features
Independent Modulator and Demodulator Tunable Modulated Subcarrier 1 kHz to 2 MHz Data Rates to 250 kbps	True BPSK Modulation RS232 Remote Control High Contrast VF Display

All functions within the 780M are microprocessor controlled from either the front panel or the RS232 remote control port with the exception of the PSK modulator output level which is controlled by a front panel potentiometer. The Processor provides an interactive, menu-driven front panel user interface or accepts formatted ASCII string from the RS232 remote control port. The Modulator section accepts TTL or RS422 command data and clock, provides decoding and encoding of the input, then BPSK modulates a selectable frequency subcarrier. The resulting output is a sine wave. The subcarrier frequency is tunable from 1 kHz to 2 MHz. The demodulator/bit synchronizer section has two selectable inputs. A BPSK modulated subcarrier is acquired and the recovered baseband signal from the demodulator is passed to the bit synchronizer, where clock is recovered from the baseband data. Data and clock are provided as both TTL and RS422. Differential decoding and encoding of the recovered baseband data is provided.
Applications
The Model 780M supports a wide variety of applications encompassing testing through TT&C link support. While testing a data link, the unit allows the up-link is to be dynamically monitored. The up-link is generated by the modulator section and the wrapped around signal is monitored by the demodulator/bit synchronizer section. The Modulator and the Demodulator/Bit Synchronizer sections are independent of each other and user selectable parameters are controlled separately via the front panel, or the remote control interface. Therefore, the unit is ideally suited for TT&C applications.