Suppressing Interference - Furuno CI-68 Installation Manual

4. ADJUSTMENTS
CI-68
CI-6888
VOL.
MEM.
SIO.
CI-6810
VOL.
TBL.
MEM.
ANA.
TRM.
DSW.
DSW.
PRESS [MENU] KEY TO QUIT.
XX: Program Version No.
4.3.2

Suppressing interference

Input
Up to two interfering equipment can be connected to the interference rejection circuit
in the transceiver unit via EX KP IN 1 or EX KP IN 2 port. This circuit receives the key-
ing pulse (KP) from the interfering equipment to reject interference.
PCN (66P3924)
TB-4
9
KP IN1
16
11
KP IN2
12
Check of keying pulse
The following keying pulse is required from the interfering equipment. If the level is out
of the ratings or KP output circuit is not provided, take the measures shown on the next
two pages to prevent equipment malfunction.
4-10
6651201-XX.XX
1 2 3 OK
OK
6651202-XX.XX
1 2 3 4 5 6 7 8 OK
12V;12.03V BV;110.0V
+25.02 deg.
00 00 00 01
-- 00 00 01
Self test ([GENERAL])
TP2
H
C
TP4
H
C
Interference rejection circuit
NL -5, -6, -7
TVG ON OFF
BEAM3
BEAM1
(PORT)
(BOW)
Echo status for three beams
CR14
[EKP1]
Photo
Coupler
CR15
[EKP2]
Photo
Coupler
Noise Level
(Beam1,
Beam2, Beam3
BEAM2
in that order)
(STBD)
Flip Flop
Circuit
S1