Yaesu FTM-400DR Operating Manual page 198

The squelch detection condition during APRS (internal modem) operation and squelch
terminal output condition of the data communication (when using the [DATA] jack at the
back of the main body) can be set.
1
Press for one second or longer
The set-up menu will be displayed.
2
Touch
3
Touch
The screen for the detailed settings will be displayed.
Touch
condition during APRS operation using the internal
modem
The setting switches between "RX BAND" and "TX/
RX BAND" each time it is touched.
RX BAND: Transmission is not possible when the
receive band squelch is open.
TX/RX BAND: Transmission is not possible when
Tip Factory default value: RX BAND
5
Touch
reception) related to the squelch terminal inside the
[DATA] jack
The setting switches between "RX BAND" and "TX/
RX BAND" each time it is touched.
RX BAND: The SQL terminal becomes active when
the receive band squelch is open.
TX/RX BAND: The SQL terminal becomes active
Tip Factory default value: RX BAND
198
to select the squelch detection
either the receive band or transmit
band squelch is open.
to select the output condition (during
when either the receive band or
transmit band squelch is open.