Yaesu FT DX 9000 CONTEST - 2, Руководство по эксплуатации

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Page 28 FT
DX
9000 C
ONTEST
O
PERATION
M
ANUAL
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 oper-
ating 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 (# 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
should never be a circumstance where the tempera-
ture will rise this high, but if you are operating in a hot
environment, in Class A, and are making long trans-
missions, you may wish to reduce the Bias Level closer
to Class AB to reduce the heat dissipation associated
with Class A operation.
F
RONT
P
ANEL
C
ONTROLS
VDD TEMP SWR BIAS