Yaesu FTDX9000D Operation Manual page 34

F P
RONT ANEL
RF PWR BIAS Knobs
RF PWR Knob
This is the main RF Power output control for the
transceiver, active in all operating modes. Clock-
wise rotation increases the power output. Adjust
this control for the desired power output from the
FT 9000, or for the desired system output when
DX
using a linear amplifier or transverter.
BIAS Knob
During SSB operation, pressing the CLASS-A but-
ton will lower the power putput to a maximum of 75
Watts, and the BIAS control will then provide adjust-
ment of the final amplifier Bias level between classes
AB and A. Full Class-A operation provides an ultra-
clean SSB wafe-form. Because Class A is a high-bias,
low-efficiency mode, you should monitor the heat sink
temperature (using the "SWR" page on the TFT pe-
riodically to ensure that the operating temperature is
within the safe range, and you may adjust the Bias
level more toward the "AB" side if the heat sink gets
too warm. The power output will not change if you
adjust the setting of the BIAS control.
CLASS-A Switch
Pressing this switch engages the Class-A capability
for the transmitter. The power output will be reduced
to a maximum of 75 Watts, and the Bias level may be
adjusted using the BIAS control, described in the pre-
vious section. When Class-A opeatin is engaged, the
Red LED inside this switch will light up. Press this
switch once more to return to Class AB operation at a
maximum power output of 200 Watts; the Red LED
will shut off to confirm Class AB operation.
Page 32
C
ONTROLS
CF Card Slot
This slot accepts the supplied Compact Flash (CF) Card,
which allows storage, transfer, and recall of transceiver
configuration data and operator preferences, along with
Log Book data, etc. When the CF Card is successfully
inserted, the Red LED by the slot will light up.
To remove the card out from slot, press the small push-
button at the right hand side of the slot.
Advice
If you get the [PLEASE CHECK A DISK] error message to
the right of the MEM CARD indication on the TFT, check
the position of the CF Card in the slot for proper alignment.
AF GAIN
AF GAIN Knob
Clockwise rotation of this control increases the Volume
level. Typically, you will operate with this control set past
the 9 o'clock to 10 o'clock position.
RF GAIN Knob
This is the control that adjusts the gain of the Main (VFO-A)
band receiver's RF and IF stages. Clockwise rotation increases
the gain level, and this control typically is left in the fully
clockwise position, which provides maximum receiver gain.
Using the Menu, it is possible to change the RF GAIN control
(for the Main (VFO-A) band) to serve as the Sub (VFO-B)
AF GAIN control. In this case, the Menu Item GENERAL
038 AF/RF DIAL SWAP will move the Main (VFO-A) RF
GAIN control function to the knob normally utilized for the
Sub (VFO-B) receiver's AF GAIN control. In this way, both
the Main and Sub receiver AF GAIN controls will be on the
same shaft, as will the two receivers' RF GAIN controls.
RF GAIN Knobs
FT 9000D O
DX PERATION
M
ANUAL