User's Manual

Rajant Corporation BreadCrumb
®
LX User Guide
Version 1.06 June 25, 2008
- 14 -
2.7 ANTENNA FEATURES
The BreadCrumb LX makes use of two antenna ports, and are used alternately by the
BreadCrumb, based on which one has the better signal.
Both external antennas MUST be connected to the device at all times for
proper operation.
Always connect or disconnect external antennas with the power to the
BreadCrumb LX off.
Because the two antennas are mounted top and bottom on opposite corners of the unit (as
shown in Figure 4), the only viable means of using the LX with both antennas attached is by
using the pole mount. 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 802.11b/g 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. So it is much
more forgiving of imperfect placement than the 802.11a antenna.