| AS-1789/SLR-12 |
|
| Physical
Dimensions |
|
| Height |
31
- 7/8 inches
|
| Diameter |
16
inches |
| Weight |
96
lbs |
| Operating
Temperature |
-28
C to +65 C |
|
|
| Frequency
Range |
Unavailable
|
| Input
Impedance |
50
ohms |
| VSWR |
>
3:1
|
| Polarization |
Linear
in either plane or circular in either sense with
separate RF outputs for right and left circular |
| RF Power
Rating |
n/a,
receive only |
| Power
Requirement |
Servo
power and control voltages supplied from control
unit |
| Feed
Type |
Video
output unbalanced, coaxial cable |
| Input
Connector |
Video
output Type N |
|
|
Description:
Antenna AS-1789/SLR-12 is a rotatable direction finding
antenna used withAN/SLR-12 Countermeasures Receiving Set.
The antenna consists of a main cylindrical housing that
contains the antenna drive motor, rotating joint, and
synchro generator and tachometer to provide antenna azimuth
and speed information to the central unit. The rotating
antenna is mounted on the upper platform of this housing.
The RF section of the crystal video receiver and a test
source to check system performance are located in the lower
portion. A clamp-on radome protects the antenna from the
weather and a similar type of enclosure covers the equipment
in the lower section. The functions of the antenna are
controlled from the C-6612/SLR Control Indicator.
Installation: The center housing has two 23 x 1
- 1/2 angle brackets for mounting the antenna. Each bracket
has two 9/16 inch diameter bolt holes on 19 - 3/4 inch
centers for attachment to a platform or other suitable
structure. The antenna should be mounted sufficiently high
to provide omnidirectional horizon coverage. It should not
be installed in the main beam of any high-power transmitting
equipment. The bench mark on the antenna housing must be
aligned with the fore and aft centerline of the ship. A
minimum space of 13 inches above and 9 inches below the
antenna must be provided to permit removal of the radomes
for servicing.
Considerations: Since the output to the
receiver is a video signal, the distance between the antenna
and control unit is not critical. However, this distance
should not exceed 600 feet. |
