Bandwidth Diversity Reception - Yaesu FTDX9000D - DATA MANAGEMENT Operation Manual

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Bandwidth Diversity Reception

This mode involves receiving the same signal through two different bandpass filters. The frequency and mode of both the
Main band (VFO-A) and Sub band (VFO-B) are the same. The Main band (VFO-A) can be set up for a narrow bandpass,
and the Sub band (VFO-B) for a wide bandpass, using the [ WIDTH ] knobs, 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 an external stereo speaker are recommended 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 to copy this mode and fre-
quency into the Sub band (VFO-B).
If using headphones, set the headphone mixing
scheme to the "MID" mode via the Menu Selection
"RX AUDIO 083 HEADPHONE MIX" and acti-
vate dual reception.
Adjust the [ AF GAIN ] knob(s) to balance the vol-
ume of the two receivers.
Now try manipulating the [ SHIFT ] and [ WIDTH ] con-
trols (on both Main band (VFO-A) and Sub band
(VFO-B) (receivers) to observe the interesting effects
of bandwidth diversity.
Similar in concept to the bandwidth diversity capability just described, another interesting capability of the FT
is the ability to use two different antennas on the same frequency, using dual reception. 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-polarization antenna avail-
able can fill in the signal during deep fades, and you may then transmit on whichever antenna is providing the
strongest signal at the moment (see the discussion below on Split Frequency operation).
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knob Sub (VFO-B)
Polarity Diversity
D O
UPLEX PERATION
[ A M ] switch
[ ] knob Main (VFO-A)
FT 9000D O
DX
9000
DX
M
PERATION ANUAL