Yaesu FTDX9000D Operation Manual page 51

The FT 9000 (all versions configured for Dual Re-
DX
ceive) includes a unique capability among HF transceiv-
ers: the ability to operate in a full diplex environment,
where by you can transmit on the Main (VFO-A) band
while simultaneously tuning around, on a different band,
on the Sub (VFO-B) band. This affords the contest opera-
tor extra tuning time in search of new contacts and multi-
pliers while calling CQ on the "run" band. This yields
"SO2R" (Single Operator, Two Radio) operating capabil-
ity while using only one transceiver!
To engage Full Duplex crossband operation, set Menu item
TX GNRL 158 FULL DUP to "DUP" instead of the de-
fault "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 (VFO-B) band frequency while transmitting,
during dual receive operation, on a different band on the
Main (VFO-A) band. 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 (VFO-B)
band "TX" Button/LED to switch transmit control to that
VFO to call a station, then press the Main (VFO-A) band
"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 9000. It relieves you of the need to run
DX
separate key, PTT, and other control lines to two different
radios from your logging computer.
FT 9000D O
DX PERATION
C
D R
UAL ECEIVE
M
ANUAL
ONVENIENT
Note
Full Duplex operation within the same band (e.g. both Main
and Sub VFOs on 20 meters) is not possible.
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 9000, you should observe "10 mW" or less
DX
on the Wattmeter.
F
EATURES
Page 49