Yaesu FTDX-9000MP, Руководство по эксплуатации

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Page 53 FT
DX
9000MP O
PERATION
M
ANUAL
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EATURES TURES
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Using Headphones for Dual Receive
To take advantage of dual reception, you will want to connect stereo headphones to the PHONES jack. Like the [ AF GAIN
]
control, headphone audio mixing can also be configured as desired from Menu Selection: “ RX AUDIO 083 HEAD-
PHONE MIX .” Three audio mixing schemes are selectable as follows:
SEPARATE : 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.
COMBINE-1 : 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 attenuated in the right
ear.
COMBINE-2 : Audio from both Main band (VFO-A) and Sub band (VFO-B) receivers is combined and heard equally in
both ears “Monaural” mode).
Sideband Diversity Reception
Here you receive a single AM signal through the two receivers, 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 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 speaker connected to the rear panel EXT SP jacks.
D
UAL
R
ECEIVE
: F
ULL
D
UPLEX
O
PERATION
Set the Main (VFO-A) band to either LSB or USB
mode, and tune for zero beat on the desired signal.
Press the [
A X B
] button to copy this mode and fre-
quency into the Sub (VFO-B) band, then press the
mode button to select the opposite sideband for the
Main (VFO-A) band.
If using headphones, set the headphone mixing scheme
to the “COMBINE-1” mode via the Menu Selection:
“
RX AUDIO 083 HEADPHONE MIX ”, and acti-
vate dual reception.
Adjust the [
AF GAIN
] knob(s) to balance the volume
of the two receivers.
If interference is present on one of the channels, you may
have to turn its [
AF GAIN
] control to suppress that chan-
nel (or press the green [ RX
] LED/button to disable the
receiver with the sideband experiencing interference). Oth-
erwise, try changing the headphone audio mixing scheme
to “SEPARATE” or “COMBINE-2” in the Menu Selec-
tion: “
RX AUDIO 083 HEADPHONE MIX ” for differ-
ent effects (or try settings with similar effects on your ex-
ternal 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.
VDD TEMP SWR BIAS
Switch
MAIN(VFO-A)
[AF GAIN] Knob
SUB(VFO-B)
[AF GAIN] Knob
SUB(VFO-B)
[RX] Key
SUB(VFO-B)
[RX] Key