Rx Ant (Connect, Disconnect) - Furuno FS-1575 Service Manual

10. RX ANT (CONNECT, DISCONNECT)

Make setting of this Submenu-3 depending on whether or not a RX antenna is installed.
Setting RX ANT to "CONNECT" will allow for the setting of [MENU] -> 5.SYSTEM
-> 7.RX SETUP -> "ANT SELECT."
Refer to "Receiving Antenna Configuration" on page 4-73.
Reference)
When selecting [MENU] -> 5.SYSTEM -> 7.RX SETUP -> 2.ANT SELECT and
setting "2.ANT SELECT" to "RX ANT," the T/R antenna will be grounded with the
antenna coupler when receiving.
The connection to the ground is made through the "K30" relay on the COUP board.
In other words, the setting of RX ANT interlocks with the K30 relay on the COUP
board.
The following section shows matching circuits configured by combined use of the
Submenus "COUPLER THROUGH" and "RX ANT".
Condition: Receiving
Throught: OFF
RX ANT: DISCONNECT
RF IN
K27: ANT BK
Condition: Reciveing
Thought: OFF
RX ANT: RX ANT
RF IN
K27: ANT BK
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Condition: Transmitting
Throught: OFF
RX ANT: DISCONNECT
RF IN
K28: ANT BK
ANT
K29: ANT BK
K30:
RX GND
Condition: Transmitting
Thought: OFF
RX ANT: RX ANT
RF IN
K28: ANT BK
ANT
K29: ANT BK
K30:
RX GND
4-71
K28: ANT BK
K27: ANT BK
K29: ANT BK
K28: ANT BK
K27: ANT BK
K29: ANT BK
4.7 SERVICE
ANT
K30:
RX GND
Fig. 4.7.2
ANT
K30:
RX GND
Fig. 4.7.3