Gai-tronics MRTI 2000 (No. PL1877A) Microprocessor Radio Telep Manual de usuario Pagina 34

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PC Programming PL1877A Microprocessor Radio Telephone Interconnect
12/10 28
Basic Operation
Basic Operation – Mode Selection
Mode of Operation
Selects between Half Duplex, Signal Search Simplex, or Enhanced VOX Simplex modes.
Half Duplex should be chosen when the unit is directly attached to a repeater station.
Signal Search Simplex is selected when the Interconnect is installed at your base station. It requires
the transmit-to-receive turnaround time be less than 50 ms to avoid clipping of words during the
receive sample period.
Enhanced VOX Simplex is normally chosen when the unit is attached directly to a control station.
Signal Search Period
Contains the control value for the signal search frequency - the number of times per second that the base
station reverts to the receive mode to check for a mobile carrier. It applies only when the signal search
simplex is the selected operational mode. The range is 250–2500 ms in 25 ms increments.
Signal Search Duration
This is the time interval in which the base station reverts to the receive mode to check for a mobile
carrier detect. Applies only to the signal search simplex mode. The range is 15–l00 ms in 5 ms
increments.
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