Linear Phase Modulator - Model 792 - GDP Space Systems - Telemetry Systems, Synchronizers, BERTS, Demodulaters, Modulators, Receivers, Frame Synchronizers, decommutator, Simulators

The Model 792 Linear Phase Modulator includes up to two independent RF channels with Up-converters providing outputs at S-Band and/or L-band frequencies.

Features

Single or Dual Modulators
RF Phase Modulator Outputs at S-Band / L-Band
15 MHz IF Subcarrier Out
DC to 6 MHz Modulation Signal Input

Selectable Phase Modulation Index, 0 to 3.14
Reference Clock Input / Output
RS232 and IEEE-488 Remote Control Interfaces

The RF output of the unit is produced in three stages. The first IF is set to 15 MHz. Linear multipliers (instead of saturated diode mixers or step recovery diodes) are used to up-convert to the second IF of 140 MHz. Using linear multipliers results in significantly reduced harmonics and IM (Inter-Modulation) terms and therefore, eases filtering requirements. The 140 MHz IF signal is translated to higher frequency bands by the upconverter. The upconverter accepts the 140 MHz subcarrier from the phase modulator and provides upconversion to L-Band and S-Band frequencies.

A separate output is provided on the Model 792 for the first IF signal. The lower IF output is normally set to 15 MHz for 140 MHz output to the upconverter. Tunable Linear Phase Modulated subcarriers may be programmed up to 20 MHz. if upconversion is not used.

All functions within the Model 792 Phase Modulator are controlled through the local front panel display and keypad, or the remote control port. The unit is supplied with one or two channels. Each modulator channel contains a Linear Phase Modulator and an Upconverter. The phase modulator accepts modulating frequencies up to 6 MHz.

A menu-type front panel user interface is presented to the operator on a high contrast 2-line by 40-character vacuum- fluorescent panel. Operator entries are made on a 20-position keypad. Formatted computer generated commands are used to control the unit by way of an RS-232 or IEEE-488 remote control port.


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The Model 792 Linear Phase Modulator includes up to two independent RF channels with Up-converters providing outputs at S-Band and/or L-band frequencies.
Features
Single or Dual Modulators RF Phase Modulator Outputs at S-Band / L-Band 15 MHz IF Subcarrier Out DC to 6 MHz Modulation Signal Input	Selectable Phase Modulation Index, 0 to 3.14 Reference Clock Input / Output RS232 and IEEE-488 Remote Control Interfaces

The RF output of the unit is produced in three stages. The first IF is set to 15 MHz. Linear multipliers (instead of saturated diode mixers or step recovery diodes) are used to up-convert to the second IF of 140 MHz. Using linear multipliers results in significantly reduced harmonics and IM (Inter-Modulation) terms and therefore, eases filtering requirements. The 140 MHz IF signal is translated to higher frequency bands by the upconverter. The upconverter accepts the 140 MHz subcarrier from the phase modulator and provides upconversion to L-Band and S-Band frequencies. A separate output is provided on the Model 792 for the first IF signal. The lower IF output is normally set to 15 MHz for 140 MHz output to the upconverter. Tunable Linear Phase Modulated subcarriers may be programmed up to 20 MHz. if upconversion is not used. All functions within the Model 792 Phase Modulator are controlled through the local front panel display and keypad, or the remote control port. The unit is supplied with one or two channels. Each modulator channel contains a Linear Phase Modulator and an Upconverter. The phase modulator accepts modulating frequencies up to 6 MHz. A menu-type front panel user interface is presented to the operator on a high contrast 2-line by 40-character vacuum- fluorescent panel. Operator entries are made on a 20-position keypad. Formatted computer generated commands are used to control the unit by way of an RS-232 or IEEE-488 remote control port.