Andrew TYPE 900 조립 지침 매뉴얼 - 페이지 8

{카테고리_이름} Andrew TYPE 900에 대한 조립 지침 매뉴얼을 온라인으로 검색하거나 PDF를 다운로드하세요. Andrew TYPE 900 8 페이지. 90cm, 1.0m & 1.2m smc antenna system
Andrew TYPE 900에 대해서도 마찬가지입니다: 조립 지침 매뉴얼 (16 페이지)

페이지 인쇄

ANTENNA ALIGNMENT PROCEDURE

Alignment with the satellite is obtained by setting polar-

ization, elevation and azimuth. Charts 1, 2 & 3 are to

determine the values for your earth station antenna site.

"∆L" is the difference between the earth station antenna

site longitude and the satellite longitude. Use "∆L" and

your earth station latitude to obtain polarization,

elevation or azimuth setting.

POLARIZATION OF FEED

Loosen feed horn M6 clamp bolts (12) and turn feed

clockwise or counterclockwise, depending on being east

or west of the satellite as shown on Chart 1. Align marks

on the horn clamp and appropriate mark on the horn

scale clamp is installed with arrow pointed toward antenna

as shown in Fig. 3.0. Keep cable groove on header in the

down position when adjusting polarization. NOTE:

Single Polarity Feed is factory assembled for vertical

polarity. If horizontal polarity is desired, rotate feed

90˚ (clockwise or counterclockwise).

ELEVATION

To obtain elevation value for your satellite, refer to chart

2. Loosen bolts in curved slots of AZ/EL Housing

a turn (Ref. Fig. 3.1). Turn elevation adjustment bolt

clockwise to decrease elevation and counterclockwise

to increase elevation. Align the edge of clamp with

appropriate mark at the desired elevation reading

(Ref. Fig. 3.1). NOTE: Degree values shown on eleva-

tion scale are Beam; that is when the antenna face is

vertical mechanical elevation is 0˚, while the Beam

Elevation (signal) is 22.6˚. This will be an approximate

setting. Optimum setting achieved when fine tuning.

Temporarily tighten elevation bracket nuts.

AZIMUTH

Use Chart 3 and determine your azimuth setting. Values

in chart must be adjusted for magnetic deviation for your

location for correct compass reading. Rotate the antenna

and mount, pointing it to the correct compass reading for

your location and satellite (Ref. Fig. 3.2). Slowly sweep

the antenna in azimuth until a signal is found. If the

desired signal is not found, increase or decrease

elevation setting and repeat the azimuth sweep.

FINE TUNING

Use a signal strength measuring device for final adjust-

ments to obtain maximum antenna performance.

Alternate between elevation and azimuth fine tuning to

reach maximum signal strength until no improvement

can be detected. Tighten all hardware. Torque for M8

round head, square neck bolts is 15 N-m (11 ft-lbs).

FEED

ASSEMBLY

ALIGNMENT

-40

+40

MARK

FIG. 3.0

FIG. 3.0 - POLARIZATION OF THE FEED

Align this edge

with desired

elevation setting

(shown at 22.5˚)

ELEVATION ADJUSTING BOLT

POINTER

PIVOT BOLT

AZ/EL

HOUSING

CLAMP

BOLT

FIG. 3.1 - SETTING ANTENNA ELEVATION

FIG. 3.2 - ROTATING ANTENNA FOR AZIMUTH

ARROW

AZIMUTH

POLARIZATION CHART

L" IS THE DIFFERENCE BETWEEN THE EARTH STATION

ANTENNA SITE LONGITUDE AND THE SATELLITE LONGITUDE

POLARIZATION CHART SIGN VALUES (+ OR -)

ANTENNA SITE WEST OF SATELLITE LONGITUDE

ANTENNA SITE EAST OF SATELLITE LONGITUDE

Feed Rotation (Facing Antenna)

For + Polarization, Rotate CCW (Counter Clockwise)

For - Polarization, Rotate CW (Clockwise)

75°

60°

40°

30°

20°

15°

10°

5°

EARTH STATION LATITUDE IN DEGREES NORTH OR SOUTH OF EQUATOR

CHART 1

NORTHERN

SOUTHERN

HEMISPHERE

ANTENNA

–

FEED