Bandwidth Diversity Reception - Yaesu FTDX-9000MP Operation Manual

Bandwidth Diversity Reception

This mode involves receiving the same signal through two different bandpass filters. The frequency and mode of both the
Main (VFO-A) band and Sub band (VFO-B) band are the same. The Main (VFO-A) band can be set up for a narrow
bandpass, and the Sub (VFO-B) band 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:
Ì Select the desired mode on the Main (VFO-A) band.
Ì Tune to the signal of interest.
Ì Press the A M button (#
and frequency into the Sub (VFO-B) band.
Ì If using headphones, set the headphone mixing scheme
to the "MID" mode via the Menu Selection: [
DIO 076 HEADPHONE MIX
ception.
Ì Adjust the AF GAIN knob(s) (#
ance the volume of the two receivers.
Ì Now try manipulating the SHIFT and WIDTH
controls (on both Main (VFO-A) band (#
(VFO-B) band (# ) receivers) to observe the inter-
esting effects of bandwidth diversity.
Similar in concept to the bandwidth diversity capability just described, another interesting capability of the FT
9000MP 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 available
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).
FT 9000MP O
D R : F
UAL ECEIVE
) to copy this mode
RX AU-
] and activate dual re-
and ) to bal-
) and Sub
Polarity Diversity
M
C
ONVENIENT
D O
ULL UPLEX PERATION
F
EATURES
Switch
SUB(VFO-B) MAIN(VFO-A)
AF GAIN Knob AF GAIN Knob
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