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1.6.4.8 Beacon Mode Selection (BCN)
The RDR-1600 radar system will receive, decode, and display beacon replies from a standard 2-pulse
beacon transponder and from a DO-172 6-pulse beacon transponder when the beacon mode is
selected. All beacon transponders within the selected range (160 mile maximum) will be displayed.
Each beacon transponder is assigned a numerical code, based upon the pulse spacing (2-pulse) or
based upon a binary number (6-pulse). The display range must be set for 2,5,10,20, or 40 miles to
obtain identification of the DO-172 beacon reply on the screen. The 2-pulse beacon can be identified
up to the 80-mile range.
(a) Press-on the BCN button to select the beacon mode. The beacon mode can be selected at any
time, with any other mode also selected (WX, WXA, SRI, SR2, SR3). The word BCN will
appear on the display.
(b) Press the BCN (on BCN GAIN knob) button to select the desired beacon format. Sequentially
pressing the Beacon button will select the following beacon modes: Beacon A, Beacon B, Beacon
Off, … The Beacon modes are as follows:
Beacon A DO-172 compatible beacon
Beacon B Standard two-pulse beacon
Beacon Off Removes beacon identification from the display.
(c) To identify a DO-172 6-pulse beacon, press the BCN button until A1 appears on the display.
The characters B1 will be displayed when the standard 2-pulse beacon has been selected. The
displaying of the beacon format will vary depending upon the MFD manufacturer. Please refer to
the MFD Pilot’s Guide for beacon format display.
(d) Press the PUSH CODE (located on the BCN GAIN knob) button to select the desired beacon
code number. The beacon codes are displayed sequentially (Al through A15 for the DO-172
format and B1 through B9 for the 2-pulse format) in the lower left corner of the display.
(e) Set the display range to between 2 and 40 miles for DO-172 codes, or between 2 and 80 miles
for 2-pulse codes. When a beacon reply is received that corresponds to the selected code, the
number (e.g. B3) will appear within the beacon symbol.
Note
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With either beacon format, the first mark in the
beacon reply indicates the location (range) of
the beacon. The beacon display will flash if a
primary mode is also selected (providing the
MFD is capable – see MFD Pilot’s Guide for
display details).
(f) Adjust the BCN GAIN control as required. Beacon returns are frequently very strong and the
gain must be reduced as the beacon is approached.
(g) To remove the beacon display, press the BCN button until the beacon mode is off.
