Dual Receive: Full Duplex Operation - Yaesu FTDX9000MP Operation Manual

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The FT 9000MP includes a unique capability among
DX
HF transceivers: the ability to operate in a full duplex en-
vironment, where by you can transmit on the Main (VFO-
A) band while simultaneously tuning around, on a differ-
ent band, on the Sub band (VFO-B). This affords the con-
test operator extra tuning time in search of new contacts
and multipliers while calling CQ on the "run" band. This
yields "SO2R" (Single Operator, Two Radio) operating
capability while using only one transceiver!
To engage Full Duplex crossband operation, set Menu item
"TX GNRL 174 FULL DUPLEX" to "DUP" instead of
the default "SIMP" selection. To return to normal (non-
duplex) operation, return Menu to SIMP.
When Full duplex operation is engaged, you may receive
on the Sub band (VFO-B) frequency while transmitting,
during dual receive operation, on a different band on the
Main band (VFO-A). This allows you to tune for contacts
on 15 meters, for example, while calling CQ on 20 meters
during a slow time in a contest. Press the Sub band (VFO-
B) "TX" Button/LED to switch transmit control to that
VFO to call a station, then press the Main band (VFO-A)
"TX" Button/LED to return to the "run" band and con-
tinue your "CQ" process.
This capability within a single transceiver is a unique fea-
ture of the FT 9000MP. It relieves you of the need to
DX
run separate key, PTT, and other control lines to two dif-
ferent radios from your logging computer.
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UPLEX PERATION
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Full Duplex operation within the same band (e.g.
both Main and Sub VFOs on 20 meters) is not pos-
sible.
Important Guidelines for Full Duplex Operation
Remember that, at your station location, the capability
exists for damaging RF voltage to be conducted from your
transmitting antenna into your receiving antenna during
full duplex operation. The exact amplitude will depend on
the operating frequency, proximity and polarization align-
ment of the antennas, and the transmitting power level (in-
cluding your linear amplifier, if used).
Accordingly, you should take some time, in assembling
your station, to ensure that proper isolation exists between
your station antenna systems. One way to do this is to con-
nect the "receive" antenna coaxial cable to the "Transmit-
ter" jack of low-power Wattmeter, and connect the "An-
tenna" jack of the Wattmeter to a 50-Ohm Dummy load.
Now transmit on the "TX" antenna you will be using, and
observe the deflection (if any) on the low-power Wattme-
ter connected to the "receive" antenna. For safe operation
of the FT 9000MP, you should observe "10 mW" or
DX
less on the Wattmeter.
FT 9000MP O
DX
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PERATION ANUAL