AS 682
Description, Operation and Maintenance Maintenance and Repair
ADS−B
7−23Ed. 10.07
JUMPER POSITION DEFINITION REMARKS
X1 set
open
12 VDC to ADS−B RX antenna enabled
12 VDC to ADS−B RX antenna disabled
−
default setting
X2 1−2
3−4
Mean Noise Offset (MNO): +400 mV ±50 mV
Mean Noise Offset (MNO): 0 mV ±50 mV
default setting
Test purpose
SWITCH POSITION DEFINITION REMARKS
SW1
/1 to /4
/1
/2
/3
/4
all open
if closed
if closed
if closed
if closed
SW1 is used to adjust the DC offset of the
RXU2 output signal. The offset can be ad-
justed in steps with SW1, 1...4. This reduces
the MNO value resulting from X2 setting 1−2
(approx. 400 mV) to the required value of
approx. 300 mV. The basic setting is −0 mV
(all open), maximum value is −750 mV (all
closed, "ON"). The individual values are:
(MNO) − 0 mV
(MNO) − 50 mV
(MNO) − 100 mV
(MNO) − 200 mV
(MNO) − 400 mV
Adjustable DC offset, if
jumper X2 is set to 1−2
Default setting
add to other switch settings
add to other switch settings
add to other switch settings
add to other switch settings
1b Receiver Unit 2 (RXU2) 83142 71503 2 of 2
NOTE: Jumper X1 needs to be removed when the RXU is intended to be used without the AAU, or other equipment is connected to it.
If the RXU should be operated without AAU, a separate dedicated 1090 MHz bandpass filter is needed.
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