Chapter 10 Installing the Main Antenna Feeder System
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10.4.8 Installing the Indoor Jumpers
Indoor set top jumpers are used between the lightning arrester connected to the main
feeder and the rack. Usually the finished 2m set top jumpers are used, or the jumpers
can be prepared on site as per the actual length required.
If the 2m finished jumpers are used, they can be directly installed between the lightning
arrester and the rack top.
If the jumpers are prepared on site, 1/2'' feeders should be prepared through cutting
according to the specific length of each jumper. Assemble proper feeder connectors
onto both ends of the feeders according to the feeder connector assembly instructions,
and connect the jumpers between the lightning arrester and rack top.
10.5 Checking and Testing the Antenna Feeders
After installing all the antenna feeders, conduct the SWR test on each of them. The
measured SWR should be less than 1.5 and usually less than 1.3. If this is not satisfied,
check immediately the feeder connectors installed, antenna, feeders and lightning
arresters to find where the problem comes from. For the method of SWR test with
SiteMaster, refer to Appendix G.
10.6 Waterproof Treatment for the Connectors
Caution:
The waterproof sealing for the outdoor jumpers and the feeder grounding clips of the
antenna feeder system is an important part of the antenna feeder installation. It is of
special concern. In the installation process, make sure to use waterproof tapes properly
to ensure the quality of installing the antenna feeder system.
Use 1/2'' jumpers, generally the 3m finished jumpers, between the antenna and main
feeder for transition. Connect the 1/2'' jumper and the feeder and seal their connectors
as follows:
1. Connect and fasten the antenna jumper and the main feeder connector
2. Make waterproof treatment on the connectors in the following steps:
