Yaesu FT DX 9000 CONTEST Operation Manual page 30

F F F F F P P P P P C C C C C
R R R R R ONT ONT ONT ONT ANEL ANEL ANEL ONTR ONTR ONTR OLS
ONT ANEL ANEL ONTR ONTR
Frequency Display ( See Page 36 )
The upper large display field indicates the current oper-
ating frequency on the VFO-A, and its TX/RX status.
The lower small display field indicates the current op-
erating frequency on the VFO-B, and its TX/RX status.
LCD Display
This 1.8 inch LCD display is used for viewing the
status of the VFO-A and VFO-B VFOs, and it indi-
cates 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 ] (#
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.
Page 28
OLS OLS OLS
OLS
below) switch
VDD BIAS TEMP
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 ] (#
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 should never be a circumstance where the tem-
perature will rise this high, but if you are operating in
a hot environment, in Class A, and are making long
transmissions, you may wish to reduce the Bias Level
closer to Class AB to reduce the heat dissipation as-
sociated with Class A operation.
SWR Switch
Pressing this switch enables display of the antenna
system SWR; a red LED will light up to confirm your
selection. The SWR measured at the rear panel An-
tenna Jack will be displayed during transmission.
BAND Keys
These keys allow selection of the operating band.
One key is provided for each Amateur band between
1.8 MHz and 50 MHz (except for the 60-meter band,
covered via the Memory system).
As well, direct frequency entry of the desired operat-
ing frequency may be accomplished using these keys.
If you press and hold in the [ ENT ] key for two sec-
onds, the frequency display area will change to indi-
FT 9000 C
DX ONTEST
SWR
be-
O M
PERATION ANUAL