Operation - Yaesu FT-757GX Operating Manual

Before switching on the power, check the power
supply for proper connection to the transceiver,
and proper fuse and wiring for your local AC
voltage (if using an AC supply), as described on
the previous pages. Also make sure that the
antenna or antenna tuner is connected to the
antenna j ack on the transceiver.
Connect a microphone, if desired , to the MIC jack.
See page 21 for microphone information . For CW
operation, connect a CW key or keyer paddles to
the KEY jack on the rear panel. See page 20 for
details of key connections.
Before leaving the factory , the FT-7 5 7GX is set so
that the memory backup system is disabled , so
that there is no drain on the lithium backup
battery. To activate the memory backup, simply
press both the LINEAR and MARKER switches on
the rear panel, so that they are in the out (un­
depressed) position. During operation , either one
may be pressed in without disabling the backup
system, but if both are pressed in at the same time
when no power is supplied to the transceiver, all
memory and VFO data will be cleared. (Normally,
the lithium backup battery is only used to retain
RAM data when the power is disconnected. As
long as p ower is supplied , even when the transceiver
is switched off, the data will be preserved by the
DC voltage supplied to the transceiver. )
Preset the POWER switch off, and all of the push
buttons to the undepressed position. Set the AF
control counterclockwise, and the RF control
fully clockwise . Also se t the MIC and D RIVE
controls fully counterclockwise , and the SQL con­
trol fully counterclockwise.
WIDTH and NB controls to the 12 o 'clock position.
OPERATI ON
Set the SHIFT,
- 22 -
Power
Initial Up and Tuning
Make sure the MOX and VOX buttons are in the
undepressed p osition, and then press the POWER
button. The meter and display should light, with
the display indicating the cleared (default) con­
dition: V FO A and 7 . 00 0 . 0 .
Press the large DWN o r U P button t o select the
operating band (for which the antenna is resonant),
and then advance the AF control clockwise until
noise or signals can be heard from the receiver.
Use the tuning knob or scanning buttons on the
microphone (if used) to tune the exact desired
frequency. The tuning knob tunes in 10 Hz steps,
about 10 kHz per revolution .
When using a scanning microphone, the U P and
DWN buttons on the microphone will normally
scan in 10 Hz steps at about 5 00 Hz/second . If
the FAST button on the microphone is pressed
simultaneously , the scanning rate will be about
5 kHz/se cond.
To tune outside of the normal 5 00 kHz ranges of
the amateur bands, press the 5 00k STEP button,
and then the DWN or UP button. The transceiver
will now step through the HF spectrum con­
tinuously between 5 00 kHz to 29 . 5 MHz. Press
the 5 00k STEP button again to step in the amateur
bands only . Use the 5 00k STEP function also for
stepping through the 28 - 29 . 7 MHz amateur band . .
O n the higher frequencies, i f more sensitivity is
required, press the RF AMP button.
NOTE
Under certain conditions the tuning functions of
the tuning knob and microphone scanning buttons
will be disabled . These are : when the D LOCK
(dial lock), MR (memory recall) or PMS (program­
mable memory scan) functions are enabled. To
determine which function or combination is active,
observe the display. If "LOCK" appears to the le ft
of the frequency, press the D LOCK button to
disable this function . If "MR" appears to the left
of the display, press the M R/VFO button to return
control to a VFO. If neither of the above two
conditions is present, and the frequency is con­
tinually changing, turn the SQL (squelch) control
counterclockwise to open the squelch and deacti­
vate the PMS function .