Yaesu FT DX 9000 CONTEST - MANUAL 2 Operation Manual page 141

D
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 con-
figured as desired from Menu Selection: "RX AUDIO 076
HEADPHONE MIX." Three audio mixing schemes are
selectable as follows:
OFF: Audio from the VFO-A is heard only in the left
ear, and VFO-B audio solely in the right ear.
MID: Audio from both VFO-A and VFO-B can be heard in
both ears, but VFO-B audio is attenuated in the left
ear and VFO-A audio is attenuated in the right ear.
FULL: Audio from both VFO-A and VFO-B 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
or an external stereo speaker connected to the rear panel
EXT SP jacks.
Set the VFO-A to either LSB or USB mode, and tune
for zero beat on the desired signal.
Press the A B button (#
frequency into the VFO-B, then press the mode but-
ton to select the opposite sideband for the VFO-A.
If using headphones, set the headphone mixing scheme
to the "COMBINE-1" mode via the Menu Selection:
"RX AUDIO 076 HEADPHONE MIX," and acti-
vate dual reception.
Adjust the AF GAIN knob(s) to balance the vol-
ume 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 "FULL" or "OFF" in the Menu Selection: "RX AUDIO
076 HEADPHONE MIX" for different effects (or try set-
tings with similar effects on your external amplifier). Al-
though you don't get the "stereophonic" effect in the mon-
aural mode, the two signals are still mixed, offering the
potential for much better copy than in regular AM or even
single-sideband ECSS modes.
FT 9000 C
DX ONTEST
R
UAL ECEIVE
D R : F
UAL ECEIVE
) to copy this mode and
O M
PERATION ANUAL
U
NIT
D O
ULL UPLEX PERATION
Bandwidth Diversity Reception
This mode involves receiving the same signal through two
different bandpass filters. The frequency and mode of both
the VFO-A and VFO-B are the same. The VFO-A can be
set up for a narrow bandpass, and the VFO-B for a wide
bandpass, using the WIDTH knobs, resulting in a spa-
tial perception 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 chan-
nels.
Stereo headphones or an external stereo speaker are rec-
ommended for this mode. To set up the transceiver for
bandwidth diversity reception:
Select the desired mode on the Main band (VFO-A).
Tune to the signal of interest.
Press the A M button (#
and frequency into the VFO-B.
If using headphones, set the headphone mixing scheme
to the "MID" mode via the Menu Selection "RX AU-
DIO 076 HEADPHONE MIX" and activate dual re-
ception.
Adjust the AF GAIN knob(s) to balance the vol-
ume of the two receivers.
Now try manipulating the SHIFT and WIDTH
controls (on both VFO-A and VFO-B) to observe the
interesting effects of bandwidth diversity.
Polarity Diversity
Similar in concept to the bandwidth diversity capa-
bility just described, another interesting capability
of the FT 9000 is the ability to use two different
DX
antennas on the same frequency, using dual recep-
tion. For example, you might have a horizontal Yagi
on the main band, and a vertical antenna on the sub
band, then lock the two frequencies together and
engage dual reception.
Frequently, the fading observed on the HF bands is
not so much a change in ionization level, but rather a
shift in the polarization of the signal as it travels to
and from the ionosphere. Having an opposite-polar-
ization antenna available can fill in the signal during
deep fades, and you may then transmit on whichever
antenna is providing the strongest signal at the mo-
ment (see the discussion on Split Frequency opera-
tion, see page 82).
( RXU-9000 )
) to copy this mode
Page 139