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RLC-4 V1.79 Copyright © 1998 Link Communications Inc. 9/18/98
The Autopatch
The RLC-4 supports a full/half duplex external autopatch board. When the autopatch is used, port
4 can not be used. The autopatch uses port 4's audio input, output, cor and ptt logic. RF
remoting your patch is possible (contact Link Communications for more information). This is
helpful when you can not get a phone line to the controller site and want to connect the patch
through a radio link.
Autopatch Adjustment:
The audio adjustments on port 4 are used with the autopatch. Because the patch is treated as a
radio port, normal radio port adjustments are used:
Phone - Controller Level Port 4 "RX" pot
Controller - Phone Level Port 4 "TX" pot
DTMF - Phone Level Port 4 "DTMF" pot
DTMF Level Adjustment:
The most critical audio adjustment is the DTMF level the phone company sees. This level can
range from 100mV up to 1 volt RMS. The procedure for adjusting the DTMF is to generate a
DTMF sequence (See Command 031) and measure the voltage. Adjust the DTMF level until it is
between the above levels. Usually no adjustment is needed when you receive your controller.
Audio to Phone Line Adjustment:
To adjust the audio out of the RLC-4, call a party on the phone and adjust the audio level to a point
which is acceptable to the listening party. There is no exact level to set the audio because of the
difference in line conditions.
Audio from Phone Line Adjustment:
To adjust the audio into the RLC-4 call a party on the phone and adjust the audio level to a point
which is acceptable over the air. There is no exact level to set the audio because of the difference
in line conditions.
Audio level changes when the phone is active:
If you use the autopatch in full duplex mode (see 128, default is half duplex), there will be a small
increase in the repeater's receive audio level that is present on the repeater when the autopatch is
active. This increase is caused by the hybrid in the autopatch. This level "adds" to your repeat
level when the autopatch is active. This only occurs when the autopatch is configured as full
duplex (A mode when both the Phone and Repeater audio is heard, like a normal phone). When
the autopatch is configured as half duplex the phone audio is muted when the repeater's receiver is
active, and unmuted when the repeater's receiver is inactive.
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