Furuno FS-1575 Service Manual page 231

4.13 AT-1575 Setting
To connect the AT-1575 Antenna Coupler to the FS-1575 system, connect or disconnect
the jumper pins "J4: ANT BK" and "J5: RX ANT" to or from between #2 and #4 of J4,
in order to prevent the use of these signals.
The J4 setting is made in consideration of connection to a radiotelephone not supporting
RX GND and ANT BK control signal that control the antenna coupler.
RF IN
K27: ANT BK
N.C
U10
CPU
N.C
J4
ANT BK
CONFIDENTIAL (internal use only)
This confidential document is used only by FURUNO authorized persons.
It is strictly prohibited to reproduce the document in whole or in part without prior written permission of FURUNO.
ANTBK
ANT BK
U14
ANT BK
U14
RXGND
RX GND
RX GND U14
1 3
J4
2 4
RX GND
Fig. 4.13.1 AT-1575 Jumper Setting Circuit
4-95
K28: ANT BK
K29: ANT BK
K30:
RX GND
ANT BK
K27
ANT BK
K28
U19
ANT BK
K29
RX GND
K30
Driver
AT-1575
4.13 AT-1575 Setting
ANT