Vehicular Repeater System
Futurecom Systems Group ULC. 8A083X22 Rev 4_2E.docxDOC Rev. Preliminary Page 7
2. INTRODUCTION
The Futurecom MOBEXCOM DVRS® Vehicular Repeater is designed to interface to a range of mobile radios and
control heads. It permits expanded operation of portable radios. The Vehicular Repeater system consists of. a mobile
radio, MOBEXCOM DVRS® Vehicular Repeater unit, a mobile radio Control Head and a RF multiplexer. The Control
Head communicates with the Vehicular Repeater and the mobile using a serial data protocol.
REPEATER MODES
The Vehicular Repeater operates in one of three modes. The mode of operation is selectable from the Mobile
Control Head by the mobile radio operator.
The three modes are known as the MOBILE, LOCAL and SYSTEM modes. The function and purpose of each
mode is described as follows.
Mobile Mode
In the MOBILE mode, the vehicular repeater is completely disabled. The mobile radio is operational and will
permit the mobile radio user to communicate conventionally, using the mobile radio. The mobile user may select
the desired mobile operating channel, adjust the receiver volume level and transmit using the microphone Push-
to-Talk (PTT).
This mode is used when Repeater operation is not desired. The Vehicular Repeater System operates
similarly to a standard mobile radio system, as if the Repeater were not present. The RF multiplexer is disabled
and the antenna is connected directly to the mobile radio.
The MOBILE mode should be selected if several Repeater equipped vehicles are in the same area and
another Vehicular Repeater already has LOCAL or SYSTEM mode enabled.
Local Repeat Mode
In the LOCAL repeat mode, the Vehicular Repeater is enabled to permit communications among nearby
portable radio users and the mobile radio user. Repeater signals are not retransmitted by the Mobile Radio, so
that communications on the mobile channel will not be disturbed. However, all functions of the mobile radio
operate normally, except for scan, microphone mobile Push-to-Talk, scan activation, mode selection, zone
selection, home channel operation and mobile channel selection. When the LOCAL repeat mode is selected, the
mobile radio scan is deactivated and the mobile radio reverts to the selected mobile channel. Signals received by
the Vehicular Repeater receiver are heard in the mobile speaker and will also be retransmitted by the Vehicular
Repeater transmitter. Signals received by the Mobile receiver are heard in the Mobile speaker and will be
transmitted by the Vehicular Repeater. When signals are present in both the Vehicular Repeater and Mobile
receivers simultaneously, the signal from the Vehicular Repeater will have priority in the mobile speaker. (Note
that the receiver/PTT and speaker priorities are programmable.)
The mobile user will key only the Vehicular Repeater transmitter when using the microphone Push-to-Talk.
The Vehicular Repeater receiver has full priority over the mobile radio operator microphone Push-to-Talk. To
respond to a mobile signal, the mobile operator must enter either the MOBILE or SYSTEM mode to be able to
transmit from the mobile radio.
The mobile user may adjust the receiver volume level and transmit over the Vehicular Repeater using the
microphone Push-to-Talk.
The LOCAL mode, as the name implies, permits communications among portable radio users and the mobile
radio operator, without interfering with the mobile radio dispatch channels.
