Yaesu FT-51R Owner's Manual page 27

Although you can turn down the sub-channel
volume each time you transmit (inconvenient),
or use a headset or external speaker-mic with
earphone attached (cumbersome), an easy way
to obtain hassle-free operation is to use the du-
plex function of the FT-51R.
The duplex function has three selectable modes:
Off (DUP not displayed)
disabled
ceiver is during transmit (sub-channel
display remains but reception is disabled).
Normal Audio (DUP displayed)
is enabled during Tx and audio remains at its
normal level, as set with the
Reduced Audio (DUP blinking) - Sub-channel
audio level is always reduced.
mended for cross-band full-duplex operation to
reduce audio feedback.
Select the desired mode by pressing (QM)+
repeating as necessary for the corre-
sponding display indication (DUP).
The microphone is located at the bottom of
the transceiver front panel to provide maximum
distance (audio isolation) frdm the internal loud-
speaker. This physically reduces audio feedback
and sound conduction from speaker to micro-
phone via the transceiver case.
The sub-channel re-
-
Sub-channel
-
This mode is recom-
For full-duplex telephone-style operation, the
radio can be held to your ear and operated "cel-
lular-telephone" style, keeping the
pressed continuously. Since this can heat up the
transceiver (and your hand!) considerably, we
first recommend selecting a low power* setting
if extended transmit periods are expected.
-
*Note Either the economy low
(I power output setting is ideal for this type of
operation.
de-
or low
( )