Volume 1
MIL-HDBK-162A
Section 2
15 December 1965
ITEM NAME: ANTENNA GROUP
TYPE: OA-493/APS-20
Operating Power
RELATION TO SIMILAR EQUIPMENT
AC: 115v plus or minus 5v, 1-ph, 380 to 1000 cps
DC: 28v dc, 300v regulated.
None.
Operating Temperature: -450C to plus60C.
TECHNICAL DESCRIPTION
INSTALLATION CONS IDERATIONS
Radar
Related Equipment:
Method of Radiation: Feed-horn-type radiator
Required but not Supplied. (1) Radar Set AN/APS-
illuminating parabelic reflector.
20A or AN/APS-2OC, less Antenna Assy AS-
Radiated Field: Horizontally polarized.
298I/APS-20A or AS-298/APS-20C, Antenna
Horizontal Beam Width: Not greater than 3.7 deg,
Control C-219A/APS-20 or C-219B/APS-20 or
over-all between half-power points.
C-219B/APS-20A, and C-804/APS-20A, Speed
Side Lobes: At least 16 db below the power in the
Control Box and Switching Assy, (1) Inertia
main lobe for the worse possible condition.
Switch SH-235/APA-57, (1) Radar Recognition
Azimuth-Scan Speeds: 2, 4, 6 and 8 rpm in
Set AN/APX-7, (1) Dimmer Control.
continuous search.
Sector Scan
Maximum Width: Greater than 108
Minimum Width: Less than 250 at 6 rpm.
PRINCIPAL COMPONENTS AND PHYSICAL DATA
COMPONENTS
QTY
OVERALL DIMENSIONS
UNIT WT.
(Inches)
(Pounds)
Amplifier, Electronic Control
1
7-31/32 x 11 x 18
27
AM-837/APS-20
Antenna Assy AS-539/APS-20
1
48-15/32 x 62-7/16 x 92-3/16
216
Antenna Control C-1227/APS-20
1
4-1/4 x 5-3/4 x 6
4
Relay Assy RE-146/APS-20
1
4-3/4 x 11 x 14
10
Tilt Indicator ID-360/APS-20
1
3-1/4 x 3-1/4 x 7-11/16
1
Mounting MT-1222/APS-20
1
2-1/8 x 11-1/8 x 19
2
REFERENCE DATA AND LITERATURE
Technical Manuals: AN16-350A493-1
OA-493/APS-20: 2
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