FT-920 Operating Manual
39
VFO Tuning Dial
Rotating either VFO Tuning Dial tunes the transceiver
according to the selected tuning step size. Due to the
extremely fine steps synthesized by the Direct Digital
Synthesis (DDS) circuitry, the tuning action is as
smooth as though an analog tuning VFO were being
used.
By pushing the [S
TEP] key, the tuning rate may be
modified. The [STEP] key toggles between three set-
tings: FINEÞNORMALÞFASTÞFINE. . .
The steps available in each mode are shown below.
? The [S
TEP] switch affects the action of the VFO-A
and VFO-B tuning dials, as well as the front panel
and microphone [U
P] and [DOWN] switches.
Finally, the number of tuning steps per revolution of
the tuning dials may be changed via Menu Item U-
01; see page 73 for details.
Shuttle Jog (VFO-A)
The Shuttle Jog is an efficient way to achieve large
frequency excursions, avoiding the need to spin the
VFO-A tuning dial to move quickly from one frequency
to another.
Basically, the Shuttle Jog is a spring-loaded ring used
for frequency change. Rotating the Shuttle Jog ring
away from its center detent in either direction will ini-
tiate tuning. The farther the Shuttle Jog ring is moved
from the center, the larger and faster the amount of
frequency change which results (minimum steps with
slight rotation of the Shuttle Jog ring are 10 Hz).
Front Panel U
P
/D
OWN
Switches
These switches may also be used for quick frequency
excursions from one end of a band to another. In the
“Normal” position of the [STEP] switch, for example,
one touch of the [UP] switch will cause the frequency
to jump upward by 100 kHz.
The frequency
jumps available are
shown at the right.
MH-31B8 Hand Mic U
P
/D
WN
/F
ST
Switches
Pushing the MH-31B8’s UP or DWN switch will initiate
tuning in an upward or downward direction, in fre-
quency steps set in accordance with the selection
made via the [STEP] switch. Pushing the [FST] key will
switch tuning into the “Fast” mode, as though the front
panel [STEP] switch had been set to “Fast.” See the
table below for a summary of the steps available in
these modes of operation.
MD-100A8X Desk Microphone Rotary Scanning Switch
The (optional) MD-100A8X Desk Microphone fea-
tures a Rotary Scanning Switch at the base of the
microphone support stand. Rotating this switch to the
left causes the frequency to scan lower, and rotating
the switch to the right causes the frequency to scan
higher. Rotating this switch
fully
to the left or right
causes the scanning speed to switch to the “Fast”
mode, as though you had pushed the [FST] switch on
the MH-31B8.
See the table below for a summary of the steps avail-
able in these modes of operation.
L
OCK
Switches
To guard against accidental changes in the settings
of the Tuning Dials and/or the Shuttle Jog dial, use
the Lock functions provided on the front panel.
The LOCK switches to the lower right of the VFO-A
and VFO-B Tuning Dials have slightly different ef-
fects, depending on how each switch is pressed.
These switches may be used in combination to pro-
vide the desired locking control, as shown below.
MODE
STEP Switch
NO RMAL FAST FINE
SSB, CW, DATA(SSB)
10Hz 100Hz 1Hz
AM, FM, DATA(FM)
100Hz 1kHz 10Hz
MODE UP DWN
FST
+
UP
FST
+
DWN
SSB, CW,
DATA(SSB)
{
10Hz
|
10Hz
{
100Hz
|
100Hz
AM, FM,
DATA(FM)
{
100Hz
|
100Hz
{
1kHz
|
1kHz
MODE Right Left
Fully
Right
Fully
Left
SSB, CW,
DATA(SSB)
{
10Hz
|
10Hz
{
100Hz
|
100Hz
AM, FM,
DATA(FM)
{
100Hz
|
100Hz
{
1kHz
|
1kHz
L
OCK
(A) Switch L
OCK
(B) Switch
< 0.5 sec
VFO-A Tuning Dial
and Shuttle Jog
VFO-B Tuning Dial
> 0.5 sec
None
All Switches
exp. POWER, MOX, VOX
Switches
STEP SWITCH POSITION
NORMAL FAST FINE
100kHz 1MHz 10kHz
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