SeaSpace TeraScan 1.5M, Operation And Maintenance Manual

Page: 152 / 232

136
SeaSpace Corporation
8.4.20 L/S Feed/LNA/ Downconverter [12218xxx]
The integrated L- or L/S-band Feed/LNA/Downconverter converts the RF signal to an IF signal of 137.5 MHz
that can be sent to the inside equipment without significant loss.
12218002 L-Band Feed/LNA/DC
12218004 L- and S-Band Feeds/LNA/DCs
Tools:
#2 Phillips screwdriver
hex wrench: kit
3m (10 ft) long rope, 6mm (1/8") or more thick
Part Location:
The integrated L- or L/S-band Feed/LNA/Downconverter is mounted at the dish focal point on the feed
mounting plate. See drawing 70909004, page 27, and Figure 8-14, page 137.
Procedure:
1. Turn off power to the antenna.
2. Point the dish at 0
°
elevation and tie a rope around a support strut on the back or edge of the dish to
keep it from tipping up when the Downconverter is removed.
3. Remove all cable connectors from the feed.
4. Remove the eight screws holding the feed to the struts.
5. Place the new feed on the feed struts in the same orientation as the old feed.
6. Reattach the feed to the feed struts.
7. Reattach the cable(s) to the feed.
8. Release the rope holding the dish.
9. Rebalance the antenna dish if needed (see section 8.5.1, page 152).
10. Turn on power to the antenna.
Diagnostics After Completing Repair:
1. Perform the tests of section 5.1, page 83, and observe the correct operation of the antenna.
2. Run the
sunalign
command and verify that the antenna is tracking the sun properly.
3. Track a pass and verify that the antenna is tracking properly and data is received.