| AS-2876/SRC |
|
| Physical
Dimensions |
|
| Height |
97
- 1/4 inches |
| Width |
24
inches (base) |
| Depth |
28
inches (base) |
| Weight
(antenna) |
120
lbs |
| Weight
(base) |
160
lbs |
| Operating
Temperature |
-54
C to +65 C |
|
|
| Frequency
Range |
6
to 30 MHz |
| Input
Impedance |
50
ohms |
| VSWR |
Fine
tuning VSWR > 2:1; coarse tuning > 10:1 |
| Polarization |
Vertical |
| RF
Power Rating |
1
kilowatt (average) |
| Power
Requirement |
Control
voltages supplied by control group. |
| Feed
Type |
Unbalanced,
coaxial cable |
| Input
Connector |
Type
HN |
|
|
Description:
Antenna AS-2876/SRC is a helical monopole omnidirectional
transmitting and receiving antenna. It is used with Antenna
Set OE-156/SRC. The complete OE-156/SRC consists of five
AS-2875/SRC and five AS-2876/SRC antennas and Control Group
OK-244/SRC. The OK-244/SRC controls the tuning of each
antenna under the direction of an external computer. The
AS-2876/ SRC is enclosed in a fiberglass radome. The base of
the antenna houses the electronic assembly. This assembly
contains circuits that respond to control signals from the
control group to rotate the radiating antenna. As the
antenna rotates, a tuning sleeve moves up or down the helix
changing its electrical length to tune the antenna.
Installation: The base mounting flange has
fourteen 13/16 inch diameter bolt holes for 3/4 bolts around
its periphery. Cable connections for RF input, servo power
input and antenna data are located on the base casting. Two
3/8-16 inch tapped holes are located on the base mounting
flange for attaching bond straps.
Considerations: The antenna is secured to a
hinged plate that permits the antenna to be manually tilted
90 degrees. The hinged plate is released from the base by
removing two 3/4-10 UNC hex head bolts captivated in the
base. A charging valve and pressure indicator for use in
purging and charging the antenna with dry air or nitrogen
are located on the base. The antenna is normally pressurized
to 2 psig. The coaxial and control cables to the base of
the antenna should have sufficient slack to permit lowering
the antenna without stretching the cables. |
