1-3 TM106601_(7/01)
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1.1.2.3 Beacon Mode
In the beacon mode, the system can interrogate and receive pulses from a fixed transponder(s)
located within a range up to 160 nm. Maximum range will vary depending upon the receiver
sensitivity of the beacon, and transmitted power of the beacon. The coded replies are received on a
special beacon frequency (9310 MHz). The MFD will display the location, in range and bearing
relative to the aircraft, of beacon returns from both 2-pulse and DO-172 6-pulse transponders.
A special beacon code is assigned to each beacon signal received. The code can be displayed to
identify a particular beacon reply on the screen. The beacon decoding ranges are different for the
two types of beacons. The 2-pulse beacon can only be identified when the indicator is in the 2, 5, 10,
20, 40 or 80 nm range. The DO-172 6-pulse beacon replies can only be identified when the indicator
is in the 2, 5, 10, or 40 nm range.
1.1.2.4 Dual Mode of Operation
The RDR-1600 radar system can operate in single mode or dual modes of operation. The Dual
modes of operation consist of WX/BCN, WXA/BCN, SR1/BCN, SR2/BCN, or SR3/BCN. Weather
and search modes are not allowed to operate at the same time.
1.2 EQUIPMENT PART NUMBERS AND DESCRIPTIONS
1.2.1 RDR-1600 System Components
Table 1.2-1. RDR-1600 System Components
Telephonics
Part Number
Type
Description
379-2011-001
RT-1601
Provides pulsed X-band output signal to sector scanned antenna.
Reflected signal is amplified by receiver, filtered, digitized, and
sent on to the display. The magnetron frequency is tunable and is
designed to operate at 9375
±
5 MHz to permit reliable triggering
of the beacon transponder. Operating parameters permit optimum
performance in each of the five primary modes (three search,
weather, and beacon).
4000504-0301
DA-1203A
Radar Antenna Drive unit. Positions antenna array in azimuth and
elevation axis. Motor driven, with line-of-sight stabilization.
Scans 120
°
sector. Stabilization in accordance with pitch and roll
signals from the aircraft vertical gyro and control panel Tilt
control. The tilt is selectable
±
15
°
from horizontal. Mates with
the 10-inch and 12-inch antenna arrays.
4000504-0302
DA-1203A
Same as the –0301 except for inverted mounting.
4000504-0303
DA-1203A
Same as the –0301 except includes counterweights which are
necessary for the larger antenna. Mates with the 18-inch antenna
array.
4000504-0304
DA-1203A
Same as the –0301. Special customer label.
