User Manual

3 Configuration and Installation
18 SNB900 Radio Modem User Guide
30.1 Installing an SNB900 as a repeater
To achieve coverage to all points in a survey area, an SNB900 network
can include up to two repeaters. The repeaters retransmit data packets
in a way that avoids mutual interference with the base and each other.
The operation of the repeaters is transparent to the rovers. The rover
will use the data packets from the base or repeater, whichever it
receives first.
To install a SNB900 as a repeater:
1. If using only one repeater, make sure that the SNB900 is
configured for Repeater 1. If using a second repeater, make sure
that it is configured for Repeater 2.
2. Before connecting the power cable:
a. Assemble the repeater antenna, attach it to its mount, and
then connect the complete assembly to the antenna
mounting pole.
b. Use the tripod mounting plate to mount the antenna
assembly and pole on a tripod, and then connect the
antenna cable to the SNB900 at the Radio Antenna port.
3. Connect the power cable from the SNB900 POWER port to an
appropriate 12 V DC power source. The Network menu that
appears on the front panel shows which network is in use.
C Caution – Connect the power cable with the correct polarity. Reversing
polarity does not damage the base radio modem, but will blow the
protective 10 Amp fuse in the power cable.
4. Select the repeater radio modem channel to match the base
radio modem channel. To do this, press the
UP or DOWN key
until the appropriate channel setting is displayed.
5. Verify that the channel assignments are the same for all base,
rover, and repeater units.