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Phone: 800-324-8388 970-249-6129 Fax: 970-249-8919 |
The G-8000C RS Transceiver consists of a single card with a high quality tone data receiver and a standard tone transmitter mounted on it. The tone transmitter output is designed for multiplexing into 600 ohm lines. The tone receiver uses a four coil channel filter and is intended for use on C.C.I.T.T. and similar center frequency assignments in which the channel spacing is twice the channel bandwidth. Six hundred ohms input is standard. The receiver circuit consists of a limiter circuit, a single coil discriminator, an active low data filter, a Schmitt trigger, and amplifiers.
A data carrier detector circuit (DCD) is provided, the output of which can be set to change state on the loss of carrier between -10 dBm and -30 dBm. Control circuits are provided to set the received data (RD) output lead high or low as long as the data carrier detect output is false.
The request to send (RTS) input controls the FSK tone squelch. Also, the RTS triggers a delay clear to send (CTS) output (40-200 ms adjustable). This RTS line can also be used in half duplex systems to clamp the RD into mark hold during outgoing transmissions.
All data, input and output, is buffered to provide RS232 levels. Inputs (TD, RTS) require signals greater than +3 Vdc or less than -3 Vdc. Outputs (RD, DCD, CTS) will drive 3K ohm loads greater than +3 Vdc or less than -3 Vdc.
Specifications
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