Yaesu FTDX9000D - DATA MANAGEMENT Operation Manual page 34

F P C
RONT ANEL ONTROLS
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
DX
when using a linear amplifier or transverter.
A A A A A
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The Sub band (VFO-B) frequency display will
show the RF output power for 3 seconds when-
ever the inner [ RF PWR ] knob is turned.
You may disable this feature (displaying the RF
output power) via Menu item "DISPLAY 022
LEVEL INDICATOR." See page 146 for details.
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.
Page 32
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 previous sec-
tion. 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 con-
firm Class AB operation.
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.
A A A A A
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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 RF GAIN Knobs
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
FT 9000D O
DX
M
PERATION ANUAL