4096-452 January 21, 2002 REVISION E ASSEMBLY MANUAL
3.8M C-BAND CIRC. POL Rx/Tx FEED SYSTEM
General Dynamics SATCOM Technologies 1500 Prodelin Drive Newton NC 28658 USA Phone 828-464-4141
General Dynamics SATCOM Technologies
4096-452 3.8M C-BAND CIRC POL Rx/Tx ANT SYSTEM
3.8M C-BAND CIRC POL Rx/Tx FEED SYSTEM
E D C B A
Revise to General Dynamics SATCOM Technologies Revise Address Revised Hardware Table and Figure 1 Added WR137 to Figure 1 for clarity Added note on page 1 for clarity ORIGINAL RELEASE
3/21/11 1/21/02 2/26/99 12/15/97 01-18-96 11/28/95
DATE
RAH CT RAH PGW RF R Frye
APPROVED
REV.
DESCRIPTION
General Dynamics SATCOM Technologies
4096-452 3.8M C-BAND CIRC POL Rx/Tx ANT SYSTEM
Follow the instructions supplied with the antenna system to the point of feed support assembly and then refer to the instructions below for installation of the circular polarized feed assembly. C-BAND CIRCULAR POLARIZED FEED INSTALLATION Prodelins 3.8m Rx/Tx antenna system is available in Left Hand or Right Hand Circular Polarized feed assemblies with type "N" or "WR137" transmit ports. Note that the sense of polarization is relative to the transmit band of the feed assembly and not the antenna system. For instance, a left hand circular polarized feed assembly will transmit a left hand polarized signal which will strike the reflector and be reversed to a right hand uplink to the satellite. The feed is factory assembled for testing purposes but can be switched from left hand to right hand or vice versa in the field if necessary. To switch, remove the eight screws holding the OMT to the polarizer, rotate the OMT 90 so that the arrow on the OMT flange aligns with the correct marking on the polarizer flange (LHCP or RHCP), and replace the eight screws. Tighten securely. Refer to figure 3.1-1 and the parts list for this section. Follow the instructions in the listed sequence. Do not tighten any hardware until instructed. 1. Place Feed Mounting Bracket (Item #2) on feed support and attach with 5/16-18 x 1.00 bolts, flatwashers, lockwashers, and hex nuts (item #5,6,7, 8). Tighten securely. Note that the smaller opening (2.75" dia) is for the feed horn and should be pointed toward the reflector. Place the feed assembly (item #1) into the cradle of the feed mounting bracket and secure it by placing the feed horn top clamp (item #3) in position and attach it with (2) 1/4-20 x 2.50" bolts and lockwashers (item 10,11) . Then attach the circular polarizer top clamp (item #4) in position with (2) 1/4-20 x 3.50" bolts and lockwashers (item 9,10). Tighten securely. The antenna system is now ready to be aligned to the satellite.
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General Dynamics SATCOM Technologies
4096-452 3.8M C-BAND CIRC POL Rx/Tx ANT SYSTEM
C-BAND CIRCULAR POLARIZED FEED PARTS LIST ITEM # PART # 0183-383 1 0183-384 0183-385 0183-386 2 3 4 5 6 7 8 9 10 11 0181-805 0188-172 0188-174 8031-008 8202-041 8101-009 8201-041 8030-028 8202-040 8030-020 FEED ASSEMBLY, TYPE "N" CONNECTOR, R.H. FEED ASSEMBLY, "WR137" CONNECTOR, L.H. FEED ASSEMBLY, "WR137" CONNECTOR, R.H. FEED MOUNTING BRACKET FEED HORN TOP CLAMP CIRCULAR POL TOP CLAMP 5/16-18 X 1.00 BOLT 5/16" LOCKWASHER 5/16-18 HEX NUT 5/16 FLATWASHER 1/4-20 X 3.50 BOLT 1/4 LOCKWASHER 1/4-20 X 2.50 bolt 1 1 1 2 2 2 4 2 4 2 DESCRIPTION FEED ASSEMBLY, TYPE "N" CONNECTOR, L.H. 1 QTY
C-BAND LNB/LNA ATTACHMENT 1. Apply silicone grease to gasket (item#1) and place gasket in groove in flange of LNA/LNB (customer supplied), as shown below in figure 2. Attach LNA/LNB to side port (Rx) flange of OMT with (10) 1/4-20 x 1.00" bolts, (10) 1/4" flatwashers, (10) 1/4" lockwashers, and (10) 1/4-20 hex nuts (items# 2,3,4,5). Tighten 1/4" hardware securely.
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General Dynamics SATCOM Technologies
4096-452 3.8M C-BAND CIRC POL Rx/Tx ANT SYSTEM
General Dynamics SATCOM Technologies
4096-452 3.8M C-BAND CIRC POL Rx/Tx ANT SYSTEM
PARTS LIST - C-BAND LNB/LNA ATTACHMENT ITEM # 1 2 3 4 5 PART # 0171-073 8023-008 8201--036 8202-031 8100-005 DESCRIPTION GASKET, CPR WR2296 FLANGE HALF-THICK BOLT, 1/4-20 X 1.00" TYPE 304 S.S. STD. FLATWASHER, 1/4" S.S. STD. LOCKWASHER, 1/4" S.S. STD. NUT, HEX, 1/4-20 S.S. STD. QTY 1 10 10 10 10
