Ant Select (Rx Ant, Trx Ant) - Furuno FS-1575 Service Manual

2. ANT SELECT (RX ANT, TRX ANT)

This Submenu-2 is used to select whether to use the T/R ANT as a receiving antenna or
to receive with a RX antenna.
For the installation patterns and settings of receiving antenna, refer to "Receiving
Antenna Configuration" on page 4-73.
Note)
Unless system setting is made like [MENU] -> 9.SERVICE -> 3.RT SETUP -> 1.
SETUP -> "RX ANT" -> "CONNECT," "ANT SELECTOR" is not displayed.
To set Submenu-2 "ANT SELECT" to "RX ANT," a RX antenna should be
installed. The same should apply to Full-Duplex communications.
Reference)
The RX antenna circuit is switched by the "K1" relay on the RX FIL board. This
relay is controlled by setting Submenu-2 "ANT SELECT" to "RX ANT."
Furthermore, when "ANT SELECT" is set to "RX ANT," the T/R antenna will be
connected to the ground through the "K30" relay in the antenna coupler at the time of
receiving frequency.
The T/R ANT is also connected to the ground when the power is turned off.
T/R ANT T/R ANT
R. ANT R. ANT
ATU
ATU
k28
RX
TX
K29
GND
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.
R/T ANT R/T ANT
R. ANT R. ANT
RX RF
ANT
R/T ANT
K30
R.ANT
Fig. 4.3.1 ANT SELECTOR
4-22
TX FIL
ANT
TX FIL-1
K17
TX FIL-8
K19
BK ON
RX FIL
K1
RX ANT
4.3 SYSTEM
TX IN
RX FIL