| NT-66047 |
|
| Physical
Dimensions |
|
| Height |
420
inches (including base insulator) |
| Diameter |
3
inches (less insulator) |
| Weight |
70
lbs |
| Operating
Temperature |
-32
C to +52 C |
|
|
| Frequency
Range |
300
kHz to 32 MHz (depending on the antenna coupler or
matching network used) |
| Input
Impedance |
50
ohms |
| VSWR |
VSWR
may vary from 2000:1 at 2 MHz to 1:1 near the
antenna quarter wave frequency. |
| 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-66047 Antenna is a non-telescopic 5 section 35 foot
aluminum whip. It has been the standard Navy shipboard whip
for transmitting and receiving in the LF, MF, and HF
frequency ranges. The five sections taper from 3 inches O.D.
at the base to 1 inch O.D. at the top. The sections are
coupled together by means of screw type couplings. The whip
is mounted on either an IL-18/U or IL-19/U base insulator by
means of a cast aluminum adapter piece.
Installation: The NT-66047 is mounted on the
base insulator by means of a cast aluminum adapter piece. It
is secured to the insulator mounting 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 is described
in NAVSHIPS 0967-177-3020, SHIPBOARD ANTENNA SYSTEMS,
ANTENNA INSTALLATION DETAILS. Care must be exercised not to
use dissimilar or ferrous metals when securing the antenna
to the base insulator.
Considerations: The location of the antenna
should be selected to provide as clear an area as possible
in the vicinity of the antenna and a minimum distance of 35
feet from other antennas. These requirements are necessary
to reduce the effect of the ship's structure on the
impedance, radiation pattern, and the mutual coupling
between adjacent antennas. |
