| AS-1751/SLA-12 |
|
| Physical
Dimensions |
|
| Height |
46
- 1/2 inches
|
| Width |
33
inches |
| Depth |
33
inches |
| Weight |
193
lbs |
| Operating
Temperature |
-28
C to +65 C |
|
|
| Frequency
Range |
Unavailable
|
| Input
Impedance |
50
ohms |
| VSWR |
>
2:1 over freq range
|
| Polarization |
Either
right or left circular may be switched from either
control indicator. Antenna polarizers are
interlocked making cross polarization impossible. |
| RF Power
Rating |
Transmit:
25 kw peak, 1 kw average
Receive: 1 kw
peak, 10 watts average |
| Power
Requirement |
Control
voltages are supplied from associated control
indicator. Antenna space heater voltage is also
supplied from control indicator |
| Feed
Type |
Unbalanced,
waveguide |
| Input
Connector |
Waveguide |
|
|
Description:
The AS-1751A/SLA-12 Antenna is a trainable antenna used with
electronic countermeasures equipment. It consists of a
pedestal and upper and lower shrouds. The pedestal contains
the drive motor, rotating joints, and slip rings. The
shrouds are geared to each other and rotate simultaneously.
The upper shroud mounts a circularly polarized receiving
horn and two circularly polarized direction-finding horns.
The DF horns are skewed in the shroud to provide for
amplitude comparison capability. The lower shroud mounts the
circular polarized transmitting horn. The antenna can be
equipped with either a pair of high gain, narrow beam, or a
pair of low gain wide band transmitting and receiving horns.
The antenna functions are controlled by a C-6512A/SLA-12
Control Indicator (Local) or by a C-6511A/SLA-12 Control
Inditcator (Remote). Two systems are normally installed,
port and starboard, onboard ship to provide 360 degree
coverage.
Installation: The pedestal has two mounting
bosses, each with four 11/32 inch bolt holes on two inch
vertical centers and 10 inch horizontal centers for use in
mounting the assembly. The AS-1751A/SLA-12 is usually
mounted between the AS-1750A/SL antennas on a common
vertical structure. The assembly should be installed as far
outboard as possible to obtain maximum unobstructed
coverage. The area in the vicinity of the antennas should be
clear of reflecting sur faces. The swing circle for this
antenna is 16-7/8 inches.
Considerations: The antenna assembly and its
associated waveguides require pressurization not to exceed 2
psig from a source of dry air. The lengths of all waveguides
used with this assembly should not exceed 25 feet. |
