Honeywell SPZ-8000 Maintenance Manual page 346

Digital automatic flight control system for gulfstream iv
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The AT-850 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.
~12 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-850 Antenna is designated for mounting external to the aircraft
and is not to be painted after installation. Also, the antenna is
encapsulated and is not repairable.
22-14-00
I
Page 198.181
Apr 15/93
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