| AS-2227/SRN-9 |
|
| Physical
Dimensions |
|
| Height |
51
- 1/2 inches |
| Diameter |
40
inches |
| Weight |
50
lbs |
| Operating
Temperature |
-28
C to +65 C |
|
|
| Frequency
Range |
Whip:
400 MHz
Spiral Cone: 150
MHz |
| Input
Impedance |
50
ohms |
| VSWR |
>
2:1 |
| Polarization |
Vertical |
| RF
Power Rating |
n/a,
receive only |
| Power
Requirement |
15
vdc for preamplifiers. This voltage is carried over
the signal coaxial cable. |
| Feed
Type |
Unbalanced,
coaxial cable |
| Input
Connector |
Type
N |
|
|
Description:
The AS-2227/SRN-9 Antenna is a unit of the OE-49/SRN-9
Antenna Group. The antenna group includes the AS-2227/SRN-9
Antenna and the AM-6034/SRN-9 Electronic Amplifier-Filter.
The antenna consists of a whip and a conical spiral antenna.
The whip operates on the high band and the spiral on the low
band. Since the radiated signals from the satellite are of a
low-power level and the cable runs to the receiver are
generally long, preamplifiers for each antenna are located
within the group housing. The antenna group is a component
of the AN/SRN-9 Radio Navigation Set, used to determine
ship's position from information transmitted by navigational
satellites.
Installation: The antenna group is designed for
mast or yardarm mounting. Propagation in the frequency
ranges covered by this antenna is primarily line-of-sight;
therefore, the antenna should not be shadowed by any portion
of the ship's structure. The installing activity must supply
a pad or foundation in the shape of a cross drilled to match
the bolt holes in the stiffeners on the bottom of the
antenna ground plane. The foundation should elevate the
antenna sufficiently to allow cable access. Coaxial cables
are required for receive and test signals.
Considerations: Since signals in the antenna
range reflect off metallic objects, the group should not be
located near large rotating structures. Although the input
pass band of preampfilters is narrow and protected from
overloads, care should be exercised in not locating the
group in close proximity to high power, medium frequency
radars. |
