| AS-899B/SLR |
|
| Physical
Dimensions |
|
| Height |
82
inches
|
| Diameter |
34
inches |
| Weight |
268
lbs |
| Operating
Temperature |
-28
C to +65 C |
|
|
| Frequency
Range |
Unavailable
|
| Input
Impedance |
50
ohms |
| VSWR |
>
4:1 over freq range
|
| Polarization |
Elliptical,
either direction of circular polarization and any
sense of linear polarization |
| RF
Power Rating |
n/a,
receive only |
| Power
Requirement |
Servo
power and control voltages supplied from control
unit. 115 vac 60 Hz, 1 phase required for space
heaters |
| Horizontal
Scan |
360
deg, mechanical |
| Feed
Type |
Unbalanced,
three coaxial cable and one waveguide for RF. Four
coaxial for video outputs |
| Input
Connector |
Coaxial
Type N, Waveguide |
|
|
Description:
The AS-899B/SLR Antenna Assembly is a four-band, rotable
elliptically polarized direction finding antenna used with
electronic countermeasures receiving equipments. It will
also deliver video signals to early warning or monitor sets.
The assembly consists of two coaxially mounted receiving
horns, a beam-shaping reflector and a series of filters.
Each of the four horns produces two outputs: one output is
derived from right-hand polarized signals and the other from
lefthand polarized signals. One output is used as RF output
to countermeasures receivers. The other output passes
through filters to a video detector mounted inside of the
assembly and is available as a video input to an early
warning or monitor set. The base of the assembly contains
the antenna drive motor, antenna position synchro
generators, video detectors and cable connectors. Control of
the antenna is accomplished by use of a control indicator,
such as the C-3118/SLR Control Indicator. The assembly is
enclosed in a fiberglass radome.
Installation: The antenna assembly should be
mounted as high as possible on the ship's superstructure in
order to obtain maximum omnidirectional coverage as
possible. The assembly base casting has fcur 1 inch bolt
holes on 19 - 3/4 inch centers for mounting purposes. A
clearance of 12 inches is required beneath the base for
cover removal.
Considerations: The AS-899B/SLR should not be
located in the strong fields of transmitting antennas in
order to reduce the possibility of receiver overload or
video detector crystal damage. |
