Yaesu FT DX 9000 CONTEST - MANUAL 2 Operation Manual page 140

D R
UAL ECEIVE
The FT 9000 Contest which is installed the optional
DX
Dual Receive Unit (RXU-9000) includes a unique capa-
bility among HF transceivers: the ability to operate in a
full diplex environment, where by you can transmit on the
VFO-A while simultaneously tuning around, on a differ-
ent band, on the VFO-B. This affords the contest 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 158 FULL DUP" to "DUP" instead of the
default "SIMP" selection. To return to normal (non-du-
plex) operation, return Menu to "SIMP."
When Full duplex operation is engaged, you may receive
on the VFO-B frequency while transmitting, during dual
receive operation, on a different band on the 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 TX Button/LED (#
transmit control to that VFO to call a station, then press
the MAIN TX Button/LED (#
band and continue 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.
Page 138
U
NIT
D R : F
UAL ECEIVE
) to switch
) to return to the "run"
( RXU-9000 )
D O
ULL UPLEX PERATION
Note
Full Duplex operation within the same band (e.g. both
VFO-A and VFO-B 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.
FT 9000 C
DX ONTEST
O M
PERATION ANUAL