Rx Div - Furuno FS-1575 Service Manual

3. RX DIV

The R. ANT or T/R ANT allows for shared use of the WR2 antenna and the RX
receiving circuit antenna.
Since a received signal is divided into two channels, the RX FIL board is designed to
make a correction to division loss with the Q1 to equalize reception levels inputted to
the RX board even if the signal receiving channel is changed, regardless of whether or
not to use the "RX DIV: DIVIDER" circuit.
For receiving antenna installation patterns, refer to information on page 4-73.
• To activate DIV OUT-1, -2:
Select [MENU] -> 9.SERVICE -> 3.RT SETUP -> 1.SETUP -> DIVIDER -> "ON."
** The divider circuit of the RX FIL board will be activated.
• When R. ANT is installed:
Select [MENU] -> 9.SERVICE -> 3.RT SETUP -> 1.SETUP -> RX ANT ->
"CONNECT."
To switch between R.ANT and T/R ANT, select [MENU] -> 5.SYSTEM -> 7.
RX SETUP.
** Switch antenna input using "K1" of the RX FIL board. **
Note)
When the divider circuit is activated, received signals will be outputted via J5 "DIV
OUT1" and J6 "DIV OUT2." In this case, do not use J3 "LPF OUT."
Example of DIV Amplifier Characteristics
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.
0dB
7-40
7.3 Receiver Circuit
Input: R.ANT
Output: DIV OUT1