Series 04 Ku-Band TVRO Antenna

Troubleshooting and Maintenance
Series 04 Ku-Band TVRO Antenna
1. Using a ¼” Wrench remove the
four 4-40 Small Pattern Hex
Nuts and Washers. Remove
Vertex Feed Tube and set aside.
Save all Hardware for future use.
2. Before installing replacement
Vertex Feed Tube it is necessary
to observe orientation of the
inner ½ wavelength phase card.
*Orientation can also be
observed from outside of feed
tube by the 4 (2 each side)
protruding white plastic phase
card mounting points.
3. Install the replacement Vertex
Feed Tube with the phase card
oriented in the horizontal axis
(ref. to reflector).
4. Secure with the Loctite 222 and
hardware removed in step 1.
5. Check and/or adjust antenna
balance
7.4.16. Balancing the Antenna
The antenna and equipment frame is balanced at the factory however, after disassembly for
shipping or maintenance, balance adjustment may be necessary. Balancing must be done with the
power supply turned off. No belt removal is required to balance the antenna pedestal. Balancing is
accomplished by adding or removing balance trim weights at strategic locations to keep the
antenna from falling forward/back or side to side. The antenna system is not pendulous so
'balanced' is defined as the antenna remaining at rest when left in any position. The antenna should
be balanced within one or two ounces at the typical trim weight location of 2 feet from the axis of
rotation.
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