Technical Data
GARD 8000 SYS RFL Electronics
September 24, 2012 3-3 973.334.3100
3.2 COMMUNICATION INTERFACES SPECIFICATIONS
Audio Tone Interface:
The GARD 8000 System can be supplied with two or four FSK audio tone transceivers. All
transceivers are bidirectional and can be programmed for any operating frequency or bandwidth
between 300Hz and 4kHz. Channel one can be set to operate as a modem channel. This channel
provides a communication link to the remote terminal for remote interrogation, setting changes or
system testing from the local terminal.
Displayed Level Accuracy:
The levels displayed on the front panel and through remote access will be within 1 dB of the actual
values.
Operate Time:
Audio Tone Units (average trip times, Dual Tone System):
± 30 Hz Shift: 26.47 ms
± 42.5 Hz Shift: 20.57 ms
± 60 Hz Shift: 14.78 ms
± 75 Hz Shift: 12.65 ms
± 120 Hz Shift: 11.05 ms
± 150 Hz Shift: 10.12 ms
± 240 Hz Shift: 9.22 ms
Audio Interface Configurations:
Single Two-Wire Terminals
Dual Two-Wire Terminals
Single Four-Wire Terminals
Dual Four-Wire Terminals
Recommended Channel Frequencies:
Range: 300 Hz to 4000 Hz
Resolution: 1Hz
Transmit Level:
Adjustable from -40 dBm to +10 dBm in 0.25 dB steps
Receiver Sensitivity:
Minimum Input Level: -40 dBm
Maximum Input Level: 0 dBm
Receiver Dynamic Range (referenced to center point):
-17 dB to + 11 dB
Adjacent Channel Rejection:
40 dB
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