Andrew operation and maintenance Specifications download pdf (Page 50)

Chapter 2 - Installation

42S315F 2-38

The customer interface to the transmit input ports are located

at the top of the leg brace of the mount. The interface flange

provided with the feed is WR-75 cover grooved flange or CPR-

137 grooved flange.

The customer interface to the receive ports is located inside the

reflector hub. Systems integrated with LNA packages must be

attached to the receive ports and supported to prevent

damage to the waveguide flanges. Holes are provided in the

rear hub cover for type F or type N connectors with male

threads.

2.4.10 Optional Lightning Protection Installation

For best lightning protection, air terminals should always be located at the

high point of the antenna and positioned within 10 degrees of true vertical.

The procedure for installing the optional lightning protection system on the

9-Meter antenna is as follows:

1. Mount brackets and lightning points on subreflector threaded rod as

shown in drawing 571224, sheet 2.

2. Mount brackets and lightning points on highest point of reflector as

shown in 571224, sheet 3.

3. Attach aluminum cable to lightning rod clamp on subreflector

structure after first stripping cable back 3 inches.

4. Clamp cable to one of the top two spars with cable ties.

5. Route cable to lightning rod clamp on reflector. Strip 3 inches of

insulation away and attach cable to clamp.

6. Locate bi-metal clamp on side of hub opposite ladder and attach with

copper end oriented toward bottom of reflector as shown in Figure 5-

7. Route cable to bi-metal clamp using flat clamps provided to secure

cable.

8. Cut off free end of aluminum cable, strip insulation back 3 inches, and

attach it to upper end of bi-metal clamp.

9. Strip insulation back 3 inches on copper cable and attach it to lower

end of bi-metal clamp.

10. Route copper cable to ground rod or to attachment point for

grounding system using flat clamps provided to secure cable. Be sure

to provide large service loops at elevation and azimuth pivot joints.

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Andrew operation and maintenance Specifications Page 50