FT-920 Operating Manual
37
Bandwidth Selection
Optional filters are available from your Yaesu dealer
for providing selectable IF bandwidths in the CW and
AM modes. For CW, the optional YF-116C 500 Hz
filter provides the narrow selectivity needed for today’s
crowded bands, while on AM, the YF-116A filter pro-
vides a 6 kHz bandwidth for improved listening fidel-
ity.
Pressing the [N
ARROW
] key on the front panel causes
the narrower filter appropriate for that operating mode
to be switched into the circuit. See the chart below
for the bandwidths available in each mode:
r
CW “Narrow” and AM “6 kHz bandwidth” opera-
tion requires installation of an optional filter.
r
In the AM mode, when the optional AM filter is
installed, the default bandwidth will be 6 kHz;
pressing the [N
ARROW
] key engages the (SSB) 2.4
kHz filter.
r
In the FM mode, the action of the [N
ARROW
] switch
affects only the
transmitter. For 29 MHz NBFM
work, be sure to press the [N
ARROW
] switch so as
to set a maximum deviation of ±2.5 kHz, the statu-
tory deviation limit on the 10-meter band.
For 50
MHz, however, you will probably want to use the
“Wide” configuration, which provides ±5 kHz de-
viation.
Amateur Band Selection
VFO-A Band Selection
One-touch Amateur band selection is provided via
the Keypad, located between the VFO-A and VFO-B
Tuning Knobs.
Press the [14] key to change VFO-A to the 14 MHz
band. Initially, the operating frequency will be
14.000.00 MHz; rotate the VFO-A Tuning Knob to
move around in the band. Press the [CW] key to set
the operating mode to CW. Now press the [10] key;
observe that the frequency is set to 10.000.00 MHz,
and the mode is set to AM. Now press the [7] key,
and observe that the mode has changed to LSB, the
mode originally chosen on the 7 MHz band.. Press
the [14] key, and observe that the mode has similarly
reverted to CW, the last mode used on the 14 MHz
band.
VFO-B Band Selection
By pressing
and holding in the Keypad’s [G
EN
/CE]
key for ½ second, frequency command control will
be shifted from the VFO-A register to the VFO-B reg-
ister.
For example, to set VFO-B to the 21 MHz band, press
and hold in the [G
EN
/CE] key for ½ second; you will
observe that the VFO-B frequency display area will
blink. Within five seconds, press the Keypad’s [21]
key. After pressing the [G
EN
/CE] key for ½ second,
you may also change the mode of operation and/or
the antenna to be used, if you like.
?
Note that pressing the [G
EN
/CE] key for ½ second
does not, itself,
choose VFO-B to be the receiv-
ing (or transmitting) VFO register. This action acts
as a “scratchpad” function which allows VFO-B to
be set on the frequency, mode, and antenna
to be
used when VFO-B is next activated.
p
N AR ROW
S wi tch
CW
( RX ) AM
( TX ) FM
OFF
2.4kHz
Thr ough
or
6.0kHz
¦
WIDE FM
(± 2.5 kHz)
ON
0.5kHz
¦
2.4kHz
NA RROW FM
(± 5 kHz)
Содержание FT-920
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