Yaesu FT-2000D, Руководство по эксплуатации

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Page 43 FT-2000D O
PERATING
M
ANUAL
C
ONVENIENCE
F
EATURES
D
UAL
R
ECEIVE
Using Headphones for Dual Receive
To take advantage of dual reception, you will want to con-
nect stereo headphones to the
PHONES jack. Like the
AF GAIN control, headphone audio mixing can also be
configured as desired from Menu item “
091 rout
HEADPHN .” Three audio mixing schemes are selectable
as follows:
SEP SEP SEP SEP SEP
: Audio from the Main band (VFO-A) receiver is
heard only in the left ear, and Sub band (VFO-B)
receiver audio solely in the right ear.
Con1 Con1 Con1 Con1 Con1
: Audio from both Main band (VFO-A) and Sub
band (VFO-B) receivers can be heard in both ears,
but Sub band (VFO-B) audio is attenuated in the
left ear and Main band (VFO-A) audio is attenu-
ated in the right ear.
Con2 Con2 Con2 Con2 Con2
: Audio from both Main band (VFO-A) and Sub
band (VFO-B) receivers are combined and heard
equally in both ears “Monaural” mode).
Sideband Diversity Reception
Here you receive a single AM signal through the two re-
ceivers, each receiving the opposite sideband. Skywave-
propagated signals often show phase distortion 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 side-
bands 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 ste-
reo headphones connected to the front panel
PHONES
jack.
ˆ Set the Main band (VFO-A) to either LSB or USB
mode, and tune for zero beat on the desired signal.
ˆ Press the [ A
X X X X X
B
] button to copy this mode and fre-
quency into the Sub band (VFO-B), then press the mode
button to select the opposite sideband for the Main band
(VFO-A).
ˆ If using headphones, set the headphone mixing scheme
to the “
Con1 Con1 Con1 Con1 Con1
” mode via the Menu item “ 091 rout
HEADPHN ,” and activate dual reception.
ˆ Adjust the [ AF GAIN
] knob(s) to balance the volume
of the two receivers.
ˆ If interference is present on one of the channels, you
may have to turn its [
AF GAIN
] knob to suppress that
channel (or press the green [
RX
] LED/button to dis-
able the receiver with the sideband experiencing inter-
ference). Otherwise, try changing the headphone au-
dio mixing scheme to “
Con2 Con2 Con2 Con2 Con2
” or “
SEP SEP SEP SEP SEP
” in the Menu
item “ 091 rout HEADPHN ,” for different effects (or
try settings with similar effects on your external am-
plifier). Although you don’t get the “stereophonic” ef-
fect 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.