JETStream jt270m - DTMF Function（Dtmf; Call（Call; Transmit 1750 Hz（1750 Hz; A;B Mode Switch（A;B

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DTMF Function（DTMF）
The DTMF shortcut will turn DTMF Mode on or off.
Call（Call）
The CALL shortcut will toggle the CALL function on
and off.
Transmit 1750Hz（1750Hz）
The 1750Hz shortcut will transmit a 1750Hz burst
tone when pressed.
A/B Mode Switch（A/B）
The A/B shortcut will toggle between the A and B
channel.
Talk Around（Talk）
The Talk Around shortcut turns Talk Around mode on
or off.
Reverse Frequency（Reverse）
The Reverse shortcut enables or disables Reverse
frequency mode.