7.2 Antenna Unit
7-17
2. HD signal
HD signals are detected by turning on and off the lead switch by the magnet mounted on
the drive gear. This output pulse length varies with the antenna rotation. The period in
which the heading pulse is turned on is in a range of 0 to 90 degrees. The duty ratio is
1:4. See page.4-77 for related information.
Fig. 7.2.11 Installation of B.P GEN in Antenna unit of X-band Radar
Fig. 7.2.12 Block Diagram and Layout of B.P GEN board
Magnet for HD detection lead SW
B.P GEN board
Drive gear
Driven gear
HD detection lead SW
+12V
R13
Q3
Q4
HD
BP
R3
R4
R40
R7
C4
U3
U1
Heading SW
(Reed SW)
[J902-1]
[J902-2]
J901
1. HD
2. GND
3. BP
4. N.C
5. +12V
Antenna Motor
magnet
To Next Page
Loading...
