Yaesu FTdx5000MP, Руководство по эксплуатации

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Page 44 FT
DX
5000 O
PERATING
M
ANUAL
Bandwidth Diversity Reception
This mode involves receiving the same signal through two
different bandpass filters. The frequency and mode of both
VFO-A and VFO-B are the same. VFO-A can be set up for
a wide bandpass, using the [
WIDTH
] knobs, and VFO-B
for a narrow bandpass, resulting in a spatial 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 channels.
Stereo headphones or external stereo speakers are recom-
mended for this mode. To set up the transceiver for band-
width diversity reception:
Select the desired mode on VFO-A.
Tune to the signal of interest.
Press the [
A B ] button to copy this mode and fre-
quency into the VFO-B.
If using headphones, set the headphone mixing scheme
to the “
CONBINE1
” mode via Menu item “
108 ROUT
HEADPHN ”, and activate dual reception.
Adjust the [ AF GAIN
] knob(s) to balance the volume
of the two receivers.
Now try manipulating the [ SHIFT
] and [
WIDTH
]
knobs to observe the interesting effects of bandwidth
diversity.
C
ONVENIENCE
F
EATURES
D
UAL
R
ECEIVE
Polarity Diversity
Similar in concept to the bandwidth diversity just
described, another interesting capability of the
FT
DX
5000 dual reception, is the ability to use two
different antennas on the same frequency. For ex-
ample, 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-
polarization antenna available can fill in the signal
during deep fades. You may then transmit on which-
ever antenna is providing the strongest signal at the
moment (see the discussion below on Split Fre-
quency operation).