Cambium PTP 650 Installation Manual - page 16
Caution
Do not attach grounding cables to the ODU mounting bracket bolts, as this arrangement
will not provide full protection.
1 Fasten the ODU grounding cable to the top LPU using the M6 (small) lug. Tighten both
nuts to a torque of 5 Nm (3.9 lb ft):
Locking nut
Washer
M6 lug
Washer
Nut
Toothed washer
M6 lug to ODU
2 Select a tower or building grounding point within 0.3 meters (1 ft) of the ODU bracket.
Remove paint from the surface and apply anti-oxidant compound. Fasten the ODU
grounding cable to this point using the M10 (large) lug.
3 If local regulations mandate the independent grounding of all devices, add a third
ground cable to connect the top LPU directly to the grounding system.
Install external antennas for a connectorized ODU
1 Mount the antenna(s) according to manufacturer’s instructions. When using separate
antennas to achieve spatial diversity, mount one with Horizontal polarization and the
other with Vertical polarization.
2 Connect the ODU V and H interfaces to the antenna(s) with RF cable of type CNT-400
(Cambium part numbers 30010194001 and 30010195001) and N type connectors
(Cambium part number 09010091001). Tighten the N type connectors to a torque
setting of 1.7 Nm (1.3 lb ft).
3 If the ODU is mounted indoors, install lightning arrestors at the building entry point:
4 Form drip loops near the lower ends of the antenna cables. These ensure that water is
not channeled towards the connectors.
5 If the ODU is mounted outdoors, weatherproof the N type connectors (when antenna
alignment is complete) using PVC tape and self-amalgamating rubber tape.
6 Weatherproof the antenna connectors in the same way (unless the antenna
manufacturer specifies a different method).
Page 16