Honeywell KHF 1050, System Installation Manual

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KHF 1050 SYSTEM INSTALLATION MANUAL
Page 2008
Revison 2
23-10-09
Apr/2006
5.B.(5)(d) Long Wire Antenna Mounting Location
(refer to
“Figure 2003 - Typical Long Wire Antenna” )
The long wire antenna is used when the KAC 1052 Antenna Coupler is
located in the forward part of the aircraft. It will provide maximum signal
radiation off the sides of the aircraft. Significant nulls in signal strength may
be noted off the nose and tail of the aircraft.
Figure 2003 - Typical Long Wire Antenna
5.B.(5)(e) Short Grounded Wire Antenna Mounting Location
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.