Honeywell
The RT generates a high level RF
antenna.
The antenna flat-Dlate
MAINTENANCE
MANUAL
GULFSTREAMIV
pulse to be transmitted from the
radiator transmits the
RF enerqy in
narrow beam.
By turning the antenna radiator t60
degrees from ~ie
forward direction of the aircraft, the narrow beam can be made to scan a
volume
in the forward direction in order to locate weather targets.
If a
weather target is encountered, the RF energy is reflected from the target
and received by the antenna during the time between transmission pulses.
This received RF energy is routed to the receiver in the RT where it is
processed for display on the indicator.
The azimuth stepper motor drives the flat-plate radiator left and right
60 degrees for a total scan of 120 degrees in accordance with the logic
drive signals from the RT.
The sector scan rate is 14 looks per minute
for the 120-degree scan.
The antenna pedestal elevation assembly permits
the radar beam to be tilted up or down 30 degrees in each direction for a
total of 60 degrees when actuated by a combination of signals external to
the antenna pedestal and the aircraft IRS.
ANTENNA
ELEVATION
AZIMUTH
IOTARYY31NT
ROIARYJOINT
)
R-1
m
ELEVATIONAXIS
m
A21MWHAX15
AZlMUWt40T0R
CONTINUOUS
* 30 OEG. MAx
CONTROLUXIC
liOCEG. SCAN
FROM R-T
14KloKsfMlN
? Ik’’?!ii?--
,-— _ —-
i
I
I
I
I
I
I
I
/
+1
i
I
#21MUTHhWTOR
CON7RIL
AMPLIFIERS
SCAN
DISABLE
STEPPER
MOTOR
B303
L-
— — — — ——— ———— — — — — -- — — ——
Cl
SWIEP SENSE
RESOLVER
lRb
J
BXI
I
R-T STABILIZATION
ASSY
---;----m
~
AD-1 7256
WA-800 Antenna Pedestal
Block Diagram
Figure 8-6
22-14-00
Page 198.85
Aug 15/91
Use or disclosure of mformatlon on this page IS subject to the restrictions on the title page of this document.
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