Yaesu FT-757GX Operating Manual page 12

ATT
Pressing this button places a signal attenuator
in the receiver front end, to reduce the receiver
sensitivity by approximately
ing to strong signals.
PROC
When this button is depressed the AF speech
processor is activated d u ring SSB transmission.
This circuit increases the average power of SSB
voice transmissions, to the degree set by the
COMP LEVEL control on the rear panel, making
the signal more readable under weak signal con­
ditions.
NB
Depressing this button activates the noise blanker
during S SB, CW and AM reception. The NB
control at the lower right on the front panel can
then be used to set the blanking threshold and
blanking pulse width.
20
dB when listen­
Main Knob Torque
A djustment Screw
BOTTOM
- 10 -
AGC-F
In the depresse d position, this button activates
the fast AGC time constants during SSB, CW
and AM reception; for tuning, and listening to
weak signals. When not depressed, slow AGC is
provided for more comfortable reception of
strong signals.
@
MOX and VOX Push Button Switches
The MOX button allows manual closing of the PTT
line. When depressed, the transmitter will remain
a ctivated until the MOX button is pressed again (to
return to the out p osition).
The VOX button activates the voice-actuated
transmit/receive circuit during S SB, AM and FM;
and semi break-in during CW operation. In the
voice modes, this function causes the transmitter
to be activated automatically when speaking into
the microphone, according to the level set by the
VOX GAIN control on the rear panel (and the MIC
gain control). When finished speaking or releasing
the CW key, the receiver will be automatically
reactivated after a short delay, as set by the
DELAY control on the rear panel.