Yaesu FTDX-9000D Operation Manual page 23

KEY Jack
This 1/4-inch, 3-contact jack accepts a CW key or
keyer paddles (for the built-in electronic keyer), or
output from an external electronic keyer. Pinout is
shown on page 16. Key up voltage is 5 V, and key
down current is 1 mA. This jack may be configured
for keyer, "Bug," "straight key," or computer keying
interface operation via Menu Selection "MODE-CW
041 F-KEYER TYPE (see page 135)." There is an-
other jack with the same name on the rear panel, and
it may be configured independently for Internal Keyer
or pseudo-straight-key operation.
Note
You cannot use a 2-contact plug in this jack (to do so
produces a constant "key down" condition).
Cannon ("XLR") Microphone Connector
This Cannon-type (XLR) connector accepts input from
the Microphone or other XLR-equipped microphone
system. MIC connector pinout is shown on page 15.
Proper microphone input impedance is 500 ~ 600
Ohms.
If you are using a condenser microphone requiring 48
Volts DC, you may enable this voltage to appear on
the microphone line; see page 81. When the 48-volt
supply line has been enabled, the LED adjacent to the
MIC jack will glow red.
To disconnect the microphone plug, draw out the mi-
crophone plug while pressing and holding in the sil-
ver push-button.
IPO (Intercept Point Optimization) Switch
The IPO(A) Lamp-button may be used to set the
optimum receiver front end characteristics of the main
receiver circuit for a very strong-signal environment.
Selecting IPO bypasses the front end RF amplifier and
feeds the received signals directly to the first mixer of
the main band (VFO-A) receiver circuit. While the
IPO feature is activated, this button will remain illu-
minated.
The IPO(B) Lamp-button, similarly, allows direct
feed of the received signals to the first mixer of the
sub band (VFO-B) receiver circuit. While the IPO
feature is activated on the sub receiver, this button
will be lit.
Advice
The FT 9000D's first mixer is an active type, using
four SST310 Junction FETs. This mixer design pro-
vides gain to the receiver chain, so the noise figure of
the receiver is fundamentally lower than with some
other designs. Therefore, it frequently is not neces-
sary to utilize the RF preamplifier, and the receiver
Intercept Point will be substantially increased by en-
gaging IPO, so as to feed the incoming signals directly
to the first (active) mixer. We recommend that IPO be
switched on whenever possible.
FT 9000D O
F
M
P C
ANTENNA SELECT Switches
These momentary buttons select the antenna jack on
the rear panel, with the selection indicated by the LED
in each button. When an antenna has been selected
for operation on the main band (VFO-A), the LED in
the button glows red. When an antenna has been se-
lected for operation on the sub band (VFO-B), the
LED in the button glows umber.
TUNE Switch
This is the on/off switch for the FT
matic Antenna Tuner.
Pressing this button momentarily places the antenna
tuner in line between the transmitter final amplifier
and the antenna jack (the LED will become illumi-
nated). Reception is not affected.
Pressing and holding in this button for 1/2 second,
while receiving in an amateur band, activates the trans-
mitter for a few seconds while the automatic antenna
tuner rematches the antenna system impedance for
minimum SWR. The resulting setting is automatically
stored in one of the antenna tuner's 100 memories,
for instant automatic recall later when the receiver is
tuned near the same frequency.
Pressing this button momentarily, while the Tuner is
engaged, will take the Automatic Antenna tuner out of
the transmit line.
Note
When the Automatic Antenna tuner is tuning itself, a
signal is being transmitted. Therefore, be absolutely
certain that an antenna or dummy load is connected to
the selected antenna jack before pressing and holding
in the TUNE button to start antenna tuning.
9000D's Auto-
Page 21