Receiver Operation; Frequency Navigation; Vfo Operation; Main Vfo Tuning Dial - Yaesu FT-847 Operating Manual

OPERATION
F N
REQUENCY AVIGATION
Several methods of frequency setting and/or adjust-
ment are provided on the FT-847:
l The MAIN VFO Tuning Dial (for "Main VFO"
frequencies);
l The SUB-TUNE Dial (for "Sub VFO" frequen-
cies);
l The SHUTTLE JOG™ Ring (for "Main VFO"
frequencies);
l The MEM/VFO CH knob (for "Main VFO" fre-
quencies);
l The UP and DWN scanning keys on the micro-
phone;
l The qBANDp and qMH
VFOs); and
l The 12-key Keypad (for both VFOs).
VFO O
PERATION
The VFO (Variable Frequency Oscillator) system in
the FT-847 is the primary method of frequency navi-
gation. Separate VFOs are provided for the Main (left)
and Sub (right) display areas; these VFOs will be de-
scribed, throughout this manual, as the "Main" and
"Sub" VFOs, respectively.
The VFO registers are designed to minimize the
amount of operator intervention required when chang-
ing bands. Therefore, when changing bands using the
qBANDp keys, you will observe that the VFO reg-
isters do not just retain frequency information; they
also store Mode, Bandwidth, RF Amp, Clarifier, (FM)
Repeater Shift (if any), and (FM) Tone status informa-
tion independently on each VFO. When you return to
a particular band after operation elsewhere, the FT-
847 will "remember" how you were set up on that band,
so you will be ready for operation without delay.
For satellite operation, the Main VFO is generally the
one used for reception, while the Sub VFO is the one
used for transmission. When this is the case, the "RX-
TX " icon will appear on the display. If you press the
[TX (VFO/M)] key, the Main VFO will now control
the Transmit (TX) frequency, and the "TX-RX " icon
will become illuminated.
u
B] key swaps the
Pressing the [A
t
contents of the Main and Sub VFOs.
In the Satellite mode, this does not
change the "RX-TX" or "TX-RX"
configuration; it just reverses the
contents of the Main and Sub VFOs.
32
R O
ECEIVER
p keys (for both
Z
PERATION
MAIN VFO T
UNING
Rotate the MAIN VFO Tuning Dial clockwise to in-
crease the operating frequency, and rotate it counter-
clockwise to decrease the operating frequency.
The tuning rate may be increased by pressing the front
panel [FAST] key. The available "steps" for tuning of
the MAIN VFO Tuning Dial and SUB-TUNE knob
are shown in the chart below:
Available Steps
Mode
N
ORMAL
SSB/CW 0.1, 1, 10 Hz 1, 10, 100 Hz
AM/FM 10 Hz
In the SSB and CW modes, the choice of tuning steps
may be accomplished using Menu #2, as described on
page 84. Note that you may set different steps on dif-
ferent operating bands (HF/50 MHz/144 MHz/430
MHz); when making changes via Menu #2, the band
on which you are currently receiving will be the only
band on which the change in frequency steps is ex-
ecuted.
Rotate the MAIN VFO Tuning Dial to increase the
operating frequency, and rotate it clockwise to decrease
the operating frequency.
SUB-TUNE K
NOB
The SUB-TUNE knob is most often used to adjust
the uplink (transmit) frequency during satellite opera-
tion. The same frequency steps selected for the MAIN
VFO Tuning Dial will be applied to the SUB-TUNE
knob.
As with the MAIN VFO Tuning Dial, clockwise rota-
tion of the SUB-TUNE knob increases the operating
frequency.
Note: If you have selected very fine (0.1 Hz or 1 Hz)
steps via Menu #2, the SUB-TUNE control will ap-
pear to tune very slowly. If you are using the SUB-
TUNE control often, we recommend that you use the
[FAST] key, or set Menu #2 to 10 Hz steps, to make
frequency change via the SUB-TUNE control more
efficient.
FT-847 O
D
IAL
Default
Step
F
A S T
1 Hz
100 Hz 10 Hz
M
PERATING ANUAL