Yaesu FTDX-9000D Operation Manual page 34

F P
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 9000D, or for the desired system output
when using a linear amplifier or transverter.
BIAS Knob
During SSB operation, pressing the CLASS-A
button will lower the power output to a maximum
of 75 Watts, and the BIAS control will then pro-
vide adjustment of the final amplifier Bias level
between classes AB and A. Full Class-A opera-
tion provides an ultra-clean SSB wave-form. Be-
cause Class A is a high-bias, low-efficiency mode,
you should monitor the heat sink temperature (us-
ing the "SWR" page on the TFT periodically 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 capabil-
ity 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, de-
scribed in the previous section. When Class-A
operation 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
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 re-
ceiver AF GAIN controls will be on the same shaft, as
will the two receivers' RF GAIN controls.
RF GAIN Knobs
FT 9000D O M