User's Manual

3CC12426AAAA TQ BJA 01 Issue 01 - April 2001 - Draft 04 55/346
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3. Inspect the lightning arrester for damage. If there is damage, replace the lightning arrester (see
section 8.1); if not, proceed to step 4.
4. Replace the gas discharge tube; see Figure 28.
1. Use the pliers to pull the discharge tube out of the cap.
2. Push the replacement discharge tube into the cap.
3. Screw the cap into the lightning arrester by hand, then tighten the cap with the wrench.
5. Apply the dc power.
Figure 28 – Replacing a gas discharge tube in a Type N lightning arrester
2.8 – BS cables connections
Figure 29 shows a non-redundant X-Pol RBS Tx/X-Pol RBS Rx BS configuration (one X-Pol RBS Tx and
one X-Pol RBS Rx). A fully installed BS uses the following five cable types:
– RS-422 data cables (indoor and outdoor runs),
– SMA jumper cables (indoor),
– IF cables (indoor, outdoor and outdoor jumper),
– synchronization cables (outdoor),
– Bias-T (–48 V dc) power supply cable.
Tables 14 through 9-5 list the cables and connectors identified in Figure 29.
Figure 30 shows a redundant X-Pol RBS Tx/X-Pol RBS Rx BS configuration. A redundant BS
configuration has two X-Pol RBS Txs and one or two X-Pol RBS Rxs, with additional passive devices
and cables. The redundant Tx (or Rx) RS-422 data cable attaches to the IBS. The redundant
synchronization cables are connected by a 2:1 Combiner/Splitter.
Caution - Outdoor BS IF cables must be grounded via the outer conductor every 50 m
(164 ft). Additionally, the section of cable that runs up the tower or pole must be grounded
at the top and bottom of the tower or pole cable run. Use the cable grounding kits
recommended by the cable manufacturer.
Note - All outdoor cable connections should be covered with cold shrink tubing or be
wrapped in butyl electrical tape to protect against moisture.
Bolt cap
Gas discharge tube