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A.1. Remove Old Feed. Loosen the hub locking clamps, slide them toward the center of the hub, and fingertighten the nuts. Carefully push the feed hub slightly forward and slightly downward so that the spring tension of the guy wires holds the hub in place against the front surface of the seating ring. Carefully remove the hub retaining ring from the inside of the seating ring. Do not discard this ring because it will be reused. Push the feed hub slightly toward and allow it to pass through the seating ring. Then pull the remainder of the feed through the seating ring. Disconnect the guy wires from the anchor ring. Tape the two lower guy wires to the front surface of the reflector so that they can be easily reached for reattachment. A.2. Feed Replacement (Improved Hub Design). Do not remove flange covers until you are ready to connect the feed to the feed lines. The flanges must remain clean and dry. Attach the guy wires to the anchor ring of the new feed and guide the feed through the seating ring. Push the feed hub forward and slightly downward so that the spring tension of the guy wires holds the hub in place against the front surface of the seating ring. Apply a coating of 203233-2 corrosion-inhibiting compound to the groove in the seating ring. Insert the hub retaining ring into the groove in the seating ring with the overlap ends positioned toward the top of the antenna. Then apply the compound to both sides of the retaining ring. Push the feed hub slightly forward and allow it to come through the seating ring and rest against the hub retaining ring. Position the hub locking clamps on the seating ring as shown in Figure 5 and fingertighten the nuts. Then adjust the polarization (see Figures 7, 8, and 9) and tighten the nuts. |
Improved Hub Design Replacement feeds are furnished with a seating ring, guy wires and mounting hardware. Also included with these parts, some feeds will require either a vertex plate or a vertex plate and spacer plate which optimizes performance. Installation of the new vertex/spacer plate(s), however, must be done from the front side of the antenna as given for a new feed installation -- the old feed seating ring and vertex, spacer plate(s) must be removed. If no vertex/spacer plate(s) are required, most replacement feeds can be installed from the rear of the antenna (see General Note). Attach the seating ring as given in Step 1 for new feed installation. Then complete the installation as given in Step A.2. |
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Andrew Corporation |
Telephone: 708-349-3300 |
Customer Service, 24 hours: U.S.A. * Canada * Mexico: 1-800-255-1479 |
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10500 West 153rd Street |
FAX (U.S.A.) 1-800-349-5444 |
U.K. 0800 250055 * Republic of Ireland: 1 800 535358 |
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Orland Park, IL U.S.A. 60462 |
Internet: http://www.andrew.com |
Other Europe: +44 1592 782612 |