Installation Guide

Installation Manual, BLT Transceiver 04/11/02
Page 2 of 3
The module is installed inside an enclosure that cannot be easily open
or accessible to the user, so that the antenna(s) provided cannot be easily
change by the user.
Typical locations of the system(s) the BLT transceiver is installed in
require a “pole-mounting” location. This is usually accomplished by
mounting on a street light pole or a utility pole (telephone/electric pole) at 20
to 30 feet above the ground. This type of installation is required for proper
RF performance in the network.
The BLT LAN Transceiver is built to be mounted in any location, and
any orientation providing it is within the ambient temperature range of –40
to +85 degrees C and less than 95% humidity.
Connect the RJ45 serial I/O to the host controller using any length
cable between 0.5 and 3 meters.
The LAN can be powered by any dc power source from 10.5 to 15.5
volts capable of supplying 1 amp with less than 150 millivolts p-p of ripple
into the 4-pin Molex input power connector.
WARNING: The unit is protected against reverse connection for up to 2 amps for 5
seconds or forward direction up to 3kV for not more than 50 uSec. Exceeding the
proceeding may result in damage to the unit. The 12-volt return (ground) connects to
pin 4 (top pin closest to RJ45 connector) and the Plus 12 volts connect to pin 3 (top pin
closest to the two-pin Molex connector).
According to the conditions of the FCC certification, the power cable
must have a clamp-on ferrite filter with two turns through it – mounted
within 0.1 meter of the LAN power connector. The filter must provide a
minimum loss equivalent to Steward ferrite part number 28A2025-0A0.
This is a type 28 material clamp-on core having 200 – 300 ohms-per-turn at
100 MHz.
The LAN is designed to receive or transmit by switching between two
external whip antennae having omnidirectional gains of not more than 3 dBi.
Care must be exercised when connecting or disconnecting the OSX right-
angle antenna connectors: do not pull on cable; move connectors directly in
or out by holding the connector body.