Rajant Corporation BreadCrumb LX4 User Manual - page 18
BreadCrumb
®
LX4 User Guide
Rajant Corporation
Version: 2.02
03-100117-001
2.3 Antenna Connectors
The BreadCrumb LX4 provides up to four Type N female antenna connectors. One connector is
located on the front side of the enclosure (see Figure 3), the other three connectors are located on
the back side of the enclosure (see Figure 4). In general, only one antenna port per radio is utilized.
Some BreadCrumb models offer the 900 MHz antenna diversity feature, in which case two antenna
ports on the 900 MHz radio are utilized. There are many different LX4 Models available, each with
a different configuration of radios and antennas. Each antenna connector will be labeled with the
frequency of its corresponding radio.
Because the antennas are mounted top and bottom and on opposite corners of the unit, the only
viable means of using the LX4 with all antennas attached is by using the pole mount option. Care
should be taken to make sure the pole is mounted plumb (or possibly carefully tilted to account for
altitude differences) for reasons noted below:
●
The 802.11a 5 GHz Vertically Polarized Omni antenna (OD5WM-6) has an extremely
narrow coverage plane. It only extends 5 degrees above and below the center-line, even at
relatively short range. This means that two units using these antennas will have to be at the
same altitude with the antennas plumb to see each other.
●
The 802.11g 2.4 GHz Vertically Polarized Omni antenna (OD24M-7) covers a more lenient
18 degrees above and below center at distance and an even wider range up close. Therefore,
it is much more forgiving of imperfect placement than the 802.11a antenna.
Warning
To avoid possible damage to the BreadCrumb radio(s), always connect or
disconnect external antennas with the power to the BreadCrumb LX4 off.
2.4 19-Pin Amphenol Connector
The majority of the signals and features of BreadCrumb LX4 can be accessed through the 19-pin
Amphenol connector on the enclosure (see Figure 3 and Figure 5). The most important of these
interfaces are external power, Ethernet, and USB, which are described in more detail in the
following sections. The 19-pin Amphenol connector interfaces to the LX4 cable assembly that
provides access to input power, Ethernet and USB ports of the device.
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