GAI-Tronics MRTI 2000 (No. PL1877A) Microprocessor Radio Telephone Interconnect Installation & Service Manual - Manual (Page 93)

PL1877A Microprocessor Radio Telephone Interconnect Parameter Modification
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Miscellaneous
Receiver Input Audio Source
The input from the receiver is obtained from either a pre-emphasized source requiring de-emphasis
(discriminators and detectors) or from a de-emphasized (flat) source (volume control or speaker).
Parameter 01 is set to match the source.
Parameter Function
1 RX audio source is pre-emphasized = 0
RX audio source is flat = 1
Receiver Input Audio Level
The input from the receiver is obtained from either a high, mid, or low level source. Parameter 2 and
jumper JU202 must be set to match the receiver audio source. Refer to the following information in
determining the required state of parameter 2 and jumper JU202.
Audio Source Level Parameter 2 JU202
2.5 V ac 1 In
0.5 V ac 1 Out (default)
80 mV ac 0 Out
Parameter Function
10
PTT sense input is active low = 0
PTT sense input is active high = 1
Default = 0
65
Patch inhibit input is active low = 0
Patch inhibit input is active high = 1
Default = 0
549
Signaling pretime – This parameter sets the delay between activating the PTT and
generating mobile signaling (rings, paging beeps, SID, etc.). This number is x in the
following equation: pretime = 100 ms (x + 1).
Valid range = 0–24.
Default = 3