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The Model 741 SGLS Signal Demodulator system provides the user with the ability to receive and demodulate the standard SGLS FSK/AM tri-tone signal.

It reproduces 1, 0, and S with coherent command clock from the SGLS subcarrier tones of 95 KHz, 76 KHz, and 65 KHz at command rates of 1 kbps and 2 kbps. The command data rate is automatically detected by the Model 741 requiring no user setup or control. An adjustable squelch capability is provided to inhibit data output when the input drops below a preset value. Both TTL and RS422 outputs are available within the Model 741 to allow flexibility in system implementation and integration. Front panel mounted LED's indicate the occurrence of sync for a 1 kbps or 2 kbps command streams. Test points provide the user with the ability to monitor the input signal, and the reproduced S, 0, 1, and command clock streams. The Model 741 is also available in a VME module to allow integration into a user's workstation. In this configuration the model name is FDM001, FSK Demodulator.