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The AT-855 Antenna contains crossed loop H-field antennae and an E-field
antenna similar to an ADF antenna.
Preamplifier
stages
are also
built
into the antenna
in order to enhance
the system's immunity to noise originating in aircraft wiring.
The H-field
loop antennae
are designated
Hn and Hw and are orientated
in
such a manner that
Hn
will be most sensitive to signals originating
ahead or behind the aircraft, and the Hw antenna will be most sensitive
to signals originating abeam the aircraft.
The E-field antenna is constructed such as to be most sensitive to
vertical E-fields.
flz
V
dc
power
for the preamplifiers is provided to the antenna from the
processor.
The antenna also contains a test winding. During test mode this winding
is driven with a simulated lightning signal and couples with the E- and
H-elements of the antenna. Thus, the test mode is
able to provide
an
evaluation
of the performance
of the antenna,
its preamplifiers,
and
cabling
to the LP-850
Lightning
Sensor Processor.
The AT-855 Antenna is designated for radome mounting and is not to be
painted after installation. Also, the antenna is encapsulated and is
not repairable.
22-14-00
I
Page 198.183
Apr 15/93
Use or disclosure
of information
on this page is subject
to the restrictions
on the title page of this document.
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