Front Panel Controls - Yaesu FT-757GX Operating Manual

CD
POWER
This is the main on/off switch for the transceiver.
Frequency data stored in the memories and VFOs
is not affected by this switch, or by whether power
is supplied to the transceiver or not, since this data
is retained in RAM by the internal lithium battery
when the backup system is activated.
®
MICrophone
This 8-pin connector accepts the microphone plug.
When a scanning microphone is used, such as the
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M D- B8 desk microphone or the MH-1 B8 hand
microphone, the scanning buttons on the micro­
phone can be used to scan the transceiver operating
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frequency in 0 Hz steps, slow or fast. Pin con­
nection details are provided on page 21. Micro­
phone impedance should be 5 00-600 ohms.
@PHONES
S tandard monaural or stereo headphones with
4-16 ohms impedance may be connected to this
jack. S tereo headphones with a 3-conductor plug
will reproduce the audio in both ears, as with
monaural headphones with a 2-conductor plug.
Inserting a plug into this jack disables the internal
speaker, or external speaker, if connected.

FRONT PANEL CONTROLS

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@
M D
O E
This selector determines the operating mode of the
transceiver. The CW-W (wide) position activates
an internal AF filter, while the IF filter is the same
as for S S B . The CW-N (narrow) position activates
the 600 Hz narrow IF filter for further enhanced
selectivity. The USB (upper sideband) p osition is
for SSB operation generally above 10 MHz , and
LSB (lower sideband) is for S SB operation below
I 0 MHz and normal RTTY operation.
@AF % RF
The inner AF control adj usts the level of the audio
gain of the receiver. Rotate this control clockwise
to increase the volume.
The outer RF gain control adjusts the gain of the
RF and IF amplifiers via the AGC line during
reception. This control is normally set to the
fully clockwise position for maximum receiver
sensitivity and optimum amplifier linearity . When
the RF gain control is rotated counterclockwise
from its maximum position the S-meter minimum
defle ction point will move up the scale. The peak
deflection for a given signal will remain the same as
long as it is greater than the point of minimum
deflection set by this control, but the receiver will