Operation - Honeywell KHF 1050 System Installation Manual

Preliminary - Subject to Change Without Notice
5.B.(6)(c) Short Grounded Wire Antenna Mounting Location
5.B.(6)(c)1 Short Wire to Vertical Stabilizer Antenna Mounting
Revision 0
10640I00.SLK
KHF 1050 SYSTEM INSTALLATION MANUAL
Typical Long Wire Antenna
Short grounded wire antennas may be utilized on higher
speed and/or high altitude aircraft. These short wire
antennas have a minimum drag and do not develop as high
of RF voltages as do the longer wire antennas, making
them suitable for operations up to 55,000 feet. However
the efficiency of the short antenna will be lower,
especially at the low frequencies.
Typical short wire antenna lengths are approximately 8
feet (2.4 m) to 18 feet (5.5 m). The large antenna
currents require the use of a wire with low RF
resistance (i.e., large diameter and highly conductive
surface) to reduce the power losses in the wire. The
feedline and the antenna grounding must have very low
RF resistance. Only a tensioner with an attached ground
wire should be used to terminate the antenna.
Location
The most common form of short grounded wire antennas
ahve the feedthru insulator mounted on the upper aft
part of the fuselage, as far forward of the vertical
stabilizer as is practical. The antenna wire runs from
this feedthru to the tip of the vertical stabilizer. It
is important to ground this wire as high as possible on
the vertical stabilizer to maximize the efficiency and
to reduce the nulls in the pattern. This antenna will
generally exhibit maximum radiation off the side of the
aircraft.
N
Figure 2003
23-10-09
Page 2007
Mar/2003