Yaesu FT DX 9000MP CONTEST - DATA MANAGEMENT..., Operation Manual

Page: 32 / 180

Page 30 FT
DX
9000MP O
PERATION
M
ANUAL
VDD TEMP SWR BIAS
CLASS-A Switch
Pressing this switch engages the Class-A capability for
the transmitter. The power output will be reduced to a
maximum of 100 Watts, and the Bias level may be ad-
justed using the [
BIAS
] control (#
above), described
in the previous section. When Class-A opeatin is en-
gaged, the Red LED inside this switch will light up.
Press this switch once more to return to Class AB op-
eration at a maximum power output of 400 Watts; the
Red LED will shut off to confirm 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
DVICE
:
If you get the “ PLEASE CHECK A DISK ” error mes-
sage to the right of the MEM CARD indication on the
External Display, check the position of the CF Card
in the slot for proper alignment.
LCD Display
This 1.8 inch LCD display is used for viewing the
status of the Main (VFO-A) and Sub (VFO-B) bands,
and it indicates the Menu listing.
VDD/BIAS Meter
You may observe the Drain Voltage on the final am-
plifier FETs, using this meter. As well, the current Bias
Level being utilized may be observed. Press the [
VDD
]
(# below) or [ BIAS
] (#
below) switch to select
the desired information.
VDD Switch
Pressing this switch enables display of the final am-
plifier FET Drain Voltage on the [
VDD/BIAS
] meter
(# above); a red LED will light up to confirm your
selection. The display range is 0 ~ 60 Volts, and a
reading of 50 Volts is normal during transmission.
BIAS Switch
Pressing this switch enables display of the final am-
plifier FET Bias Level currently in use; a red LED
will light up to confirm your selection.
During Class-A operation, the Bias Level will indi-
cate “0%” during Class AB operation, and “100%”
during Class A. Because the power output is fixed
when the “Class A” mode has been engaged, you may
adjust the Bias Level, according to the measured tem-
perature, anywhere between Class AB and Class A,
without having to worry about the drive level being
applied to your linear amplifier.
TEMP/SWR Meter
This meter allows monitoring of the heat sink tem-
perature or the SWR as measured at the rear-panel
Antenna jack.
Press the [
TEMP
] (#
below) or [
SWR
] (#
be-
low) switch to select the desired display function.
TEMP Switch
Pressing this switch enables monitoring of the heat
sink temperature; a red LED will light up to confirm
your selection.
The measurement range for the temperature display is
0 °C ~ 100 °C, and there are four stages of cooling fan
speed that will,, progressively, increase the air flow if
the temperature rises to near the “red zone” (80 °C or
higher). Because of the advanced cooling system, there
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