| NT-66046 |
|
| Physical
Dimensions |
|
| Height |
336
inches (including base insulator) |
| Diameter |
2
- 1/2 inches (less insulator) |
| Weight |
55
lbs |
| Operating
Temperature |
-28
C to +65 C |
|
|
| Frequency
Range |
Receive:
500 kHz to 30 MHz
Transmit: 500 kHz
to 30 MHz |
| Input
Impedance |
50
ohms |
| VSWR |
VSWR
may vary from 2000:1 at 2 MHz to approximately 1:1
near the antenna quarter wave frequency. The ship's
structure in the vicinity of the antenna will
influence both the impedance and radiation pattern. |
| Polarization |
Vertical
when mounted on a true ground plane. Elliptical
depending on mounting frequency and direction in the
vertical and horizontal planes when mounted onboard
ship. |
| RF Power
Rating |
Antenna
not rated. RF power limitation is dictated by the
heat rating and flashover voltages of the base
insulators. |
| Power
Requirement |
None |
| Feed
Type |
Unbalanced |
| Input
Connector |
None,
Input to antenna is made to base insulator terminal |
|
|
Description:
The NT-66046 antenna is a non-telescoping 4 section 28 foot
aluminum whip. It is used for transmitting and receiving in
the LF, MF, and HF frequency ranges. The four sections are
tapered from 2 - 1/2 inches at the bottom section to 1 inch
at the top section. The sections are coupled together by use
of screw type couplings. The whip may be mounted to either
an IL-18/U or IL-19/U base insulator by means of a cast
aluminum adapter piece.
Installation: The NT-66046 is mounted to the
base insulator by a cast aluminum adapter piece. It is
secured to the insulator mating surface by four 5/8-11 inch
bolts on a 6 inch diameter bolt circle. The correct method
of mounting the antenna to the insulator to prevent
electrolytic action between dissimilar metals is described
in NAVSHIPS 0967-177-3020 SHIPBOARD ANTENNA SYSTEMS, ANTENNA
INSTALLATION DETAILS
Considerations: The location of the antenna
should be selected to provide as clear an area as possible
in the vicinity of the antenna with a minimum of 35 feet
from other antennas. This requirement is necessary to reduce
the effect of ship's structure on the antenna radiation
pattern, and mutual coupling between antennas. |
