Yaesu MARK-V FT-100MP, Руководство по эксплуатации, Страница: 65 / 120

Page 63
O
PERATING
M
ANUAL
Operation
U
SING
SUB VFO B
S
IDEBAND
D
IVERSITY
R
ECEPTION
Here you receive a single AM signal through the
two receivers, each receiving the opposite sideband.
Skywave-propagated signals often show phase distor-
tion in this mode, but it gives you a view of the entire
passband, from which you can then select the best
sideband for listening (or for SWL Dx’ing, you may want
to listen to both sidebands at the same time, to get the
best copy). On groundwave signals, where the phase
of the sidebands is likely to be the same, there is an
interesting sense of depth to the signal.
To tune in a signal using this mode, you should have
stereo headphones connected to the front panel
PHONES jack, or an external stereo amplifier con-
nected to the rear panel AF OUT jack.
r
Set the Main VFO to either LSB or USB mode, and
tune for zero beat on the desired signal.
r
Press [ A
u
B
] to copy this mode and frequency into
the Sub VFO, then press the mode button to select
the opposite sideband for the Main VFO.
r
If using headphones, set the headphone mixing
scheme to the Stereo 1 mode, and press [
DUAL
] to
activate dual reception. Adjust the AF GAIN
control(s) to balance the volume of the two receiv-
ers.
If interference is present on one of the channels,
you may have to turn its AF GAIN control to suppress
that channel (or press the green “RX” switch/LED to
disable the receiver with the sideband experiencing
interference). Otherwise, try changing the headphone
audio mixing scheme to Stereo 2 or Mono in the menu
selection for different effects (or try settings with simi-
lar effects on your external amplifier). Although you don’t
get the “stereophonic” effect in the monaural mode,
the two signals are still mixed, offering the potential for
much better copy than in regular AM or even single-
sideband ECSS modes.
B
ANDWIDTH
D
IVERSITY
R
ECEPTION
This mode involves receiving the same signal
through two different bandpass filters. The frequency
and mode of each VFO are the same. The main re-
ceiver provides a narrow bandpass, and the sub re-
ceiver a wide bandpass, resulting in a spatial percep-
tion of the channel. Although any mode (except FM)
can be used, CW offers the widest array of choices,
and perhaps the most startling effects on crowded
channels.
Stereo headphones or an external stereo amplifier
are recommended for this mode. To set up the trans-
ceiver for bandwidth diversity reception:
r
Select the desired mode on the Main VFO, and the
press the [
NOR
] or [
NAR1
] button (its LED will light
up).
r
Tune to the signal of interest.
r
Press [ A
u
B
] to copy this mode and frequency into
the Sub VFO, then press the [ NAR 2
] button to se-
lect a narrow filter for the Main VFO.
r
If using headphones, set the headphone mixing
scheme to the Stereo 1 mode and press [
DUAL
] to
activate dual reception. Next adjust the AF GAIN
control(s) to balance the volume of the two receiv-
ers. If using an external amplifier, adjust its balance
control.
You also may find it interesting to try the SHIFT and
WIDTH controls (on the Main receiver) for some inter-
esting effects.
Before retuning, remember to press [ DUAL
] to turn
off dual reception.
VFO T
RACKING
To have Sub VFO B track the Main Receiver VFO
while tuning (with dual reception on or off), simply hold
the [ LOCK
] button depressed.
With [ LOCK
] depressed, the “
TRACK ” indicator ap-
pears when the main tuning knob is rotated, and the
Sub VFO tracks the Main receiver. Release the button
to resume normal tuning.