14-1
RLC-4 V1.79 Copyright © 1998 Link Communications Inc. 9/18/98
Chapter 14: Doug Hall RBI-1 and RLC-ICM Routines
What the RBI-1 is:
Doug Hall Electronics' Remote Base Interface (RBI-1) allows the RLC-4 to control the Kenwood
series TM-X21 and TM-X31 mobile radios. The RBI-1 converts the data output by the RLC-4 into
a format that the radios can use. Up to four bands can be supported by one RBI-1 interface, with
one band active at a time. PL (CTCSS) encode and decode is handled by the radios. The RBI-1
plugs into one of the RLC-4's radio ports and uses some lines from the DB-25 I/O connector. The
audio, COR and PTT interface is made through the RLC-4 radio port and the signals that control
the RBI-1 and ultimately the radio come from some of the output lines on the DB-25 I/O
connector. More information about the RBI-1, including the address and phone number for Doug
Hall Electronics, is included on the following pages. Link Communications does not sell the RBI-1
interface.
What the RLC-ICM is:
The RLC-ICM is a remote base interface for IC-900 and IC-901 band modules. The RLC-ICM
uses the same data stream from the repeater controller as the RBI-1, except for the special setup
codes sent with command 139. Up to four bands can be supported by one RLC-ICM interface.
Unlike the RBI-1, more than one band can be active at the same time; up to all four bands can
transmit or receive at the same time. The RLC-ICM also supports a Communications Specialists'
TS-64 PL board for each band module. Each band that has a TS-64 can encode and decode PL.
Different bands can use different PL frequencies. The RLC-ICM plugs into one of the RLC-4's
ports. The audio, COR and PTT interface is made through the RLC-4's radio port and the signals
that control the RBI-1 and ultimately the radio come from the serial port . The RLC-ICM is
available from Link Communications.
Interfacing and Setup:
It is very easy to interface the RBI-1 or RLC-ICM to the RLC-4. Directions for building the
needed cable is provided on one of the following pages. You can build it yourself or order one
from Link Communications, Inc. The RBI-1 is connected to the radio's microphone connectors
with cables supplied with the RBI-1. The RLC-ICM includes cables and small interface boards to
connect to the IC-900/901 band modules. The only other connections are power, ground and
antenna to the radios. The RBI-1 gets its power from the radio; the RLC-ICM has its own power
plug.
If you are using the RLC-ICM, you will need to use command 139 to set it up. If you are using the
RBI-1, you can skip command 139 and go on to the other commands.
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