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When using dual polar antennas the Canopy 150/300 Mb BH-C unit should be mounted in
such a position as to minimize the cable length, keeping losses to a minimum (taking into
account the minimum cable lengths required by the FCC regulations, see section 14.7
" Antennas for USA / Canada ").
When using separate antennas the Canopy 150/300 Mb BH-C unit should be mounted in
such a position as to minimize both cable runs between the Canopy 150/300 Mb BH-C unit
and the antennas. It is not necessary to mount the unit at the mid point between the
antennas.
14.8.6 Mounting the 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 apart or at a certain distance from the ground
to get the desired results.
14.8.7 Alignment Process
When aligning antennas deployed with a Canopy 150/300 Mb BH-C unit it may not be
possible to hear the alignment tone emanating from the Canopy 150/300 Mb BH-C unit. In
this case it may be necessary for a second installer to assist in the operation. Alternatively, 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.
14.8.8 Aligning Dual Polar Antennas
The process for aligning a dual polar antenna is the same as aligning a Canopy 150/300 Mb
BH Integrated unit with an integrated antenna. This procedure is detailed in section 7.7.11
" Aligning the ODUs ".
14.8.9 Aligning Separate Antennas
When using separate antennas to achieve spatial diversity, one should 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 Canopy 150/300 Mb BH-C unit
Step 3:
Route and make off the ends of the Antenna cables
Step 4:
Connect the antenna cables at the antennas
Step 5:
Connect one of the antenna cables at the Canopy 150/300 Mb BH-C unit
Step 6:
Connect the Canopy 150/300 Mb BH-C ODU to Canopy 150/300 PIDU cable and
configure the unit as described in section 7.7 Connecting up".
Step 7:
Align the connected antenna using the tones as described in section 7.7.11
" Aligning the ODUs ".
Step 8:
Connect the other antenna to the Canopy 150/300 Mb BH-C unit.
Step 9:
Disconnect the cable to the already aligned antenna.
Issue 1.1 April 2006
Page 147
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