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The FDT003 is a SGLS FSK/AM ternary detector. A Space Ground Link System (SGLS) FSK/AM tri-tone signal is processed to produce 1, 0, and S ternary data outputs with a coherent command clock. Ternary tone frequencies and command data rate are programmed by the user. The demodulator accepts the FSK/ AM signal input and produces both TTL and RS422 ternary (1,0,S) data and clock outputs. Operational parameters for the FDT003 are programmed via the VME bus interface.
Features
SGLS FSK/AM Tri-Tone Demodulator Standard Tone Range 60 kHz to 3 MHz Command Rates 1 kbps to 110 kbps (Select four rates at time of order) Standard Rates: 1 kbps, 2 kbps, 10 kbps, 106 kbps Single-slot 6U VME module
The card occupies a single 6U x 160mm VME slot. The front panel contains SMA coaxial connectors for the FSK/AM signal input and single-ended TTL outputs (1,0,S & CLK). RS422 data and clock outputs are provided on a multi-pin connector. Status LEDs indicate the state of the synchronizers and detectors. Cascaded tunable low-pass and high-pass filters serve to limit the out-of-band noise in the incoming signal. The effective pass-band of the cascaded filters passes the signal of interest without distortion, and limits out-of-band noise. The input signal is amplitude normalized with an automatic gain control (AGC) circuit. The data rate clock is recovered from the amplitude modulated (AM) envelope of the input signal. Three FSK tones are detected using a digital frequency discriminator.