Motorola PTP 400 Series Manual De Usuario

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When using dual polar antennas the ODU should be mounted in such a position as to

minimize the cable length keeping losses to a minimum (taking into account the minimum

When using separate antennas the ODU should be mounted in such a position as to minimize

both cable runs between the ODU and the antennas. It is not necessary to mount the ODU at

the mid point between the antennas.

13.8.6 Antennas

The Antennas should be mounted according to the manufacturer’s instructions. Actual

antenna position will depend on the available mounting positions and link requirements. It

may be necessary to mount the antennas 20m (66 feet) apart or at a certain distance from the

ground to get the desired results.

13.8.7 Alignment Process

When aligning antennas deployed with a Connectorized version of the PTP 400 Series

Bridge, it may not be possible to hear the alignment tone emanating from the ODU. In this

case it may be necessary for a second installer to assist in the operation. Alternately it may

be possible to extend the tube on the supplied stethoscope to give a longer reach.

Tip: Fine antenna alignment can sometimes be achieved by tightening and loosening the

bolts on either side of the antenna mounting bracket, rather than trying to turn the whole

bracket on the mounting pole.

13.8.8 Dual Polar Antennas

The process for aligning a dual polar antenna is the same as aligning an Integrated unit with

an integrated antenna. This procedure is detailed in section 7.7.10 ”Aligning the PTP 400

13.8.9 Separate Antennas

When using separate antennas to achieve special diversity it is recommended that one be

mounted with Horizontal polarization and the other with Vertical polarization.

The following steps should be followed:

Step 1:

Mount the Antennas

Step 2:

Mount the ODU