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DMU-2000 DATA MANAGEMENT UNIT Page 39
GRAPHIC METER DISPLAYS
TEMPERATURE / SWR INDICATION
VDD
The drain voltage of the final FETs is measured and
displayed here.
In the FT-2000 (100 W version) and FT-950, the mea-
surement range is 0 ~ 18 V, and the proper voltage is
around 13.8 V. On TX, if around 13.8 V is displayed,
the transceiver is operating normally.
In the FT-2000D (200 W version) and FTDX5000,
the measurement range is 0 ~ 60 V, and the proper
voltage is around 50 V. On TX, if around 50 V is
displayed, the transceiver is operating normally.
BIAS
While operating with the Class-A on the FT-2000D
(200 W version) and FTDX5000, the bias is changed
via the Menu item “141 tGEN BIAS” (FT-2000D)
or “169 TGEN BIAS” (FTDX5000) from Class-A to
Class-AB, this indication can be used to observe the
current setting. The indication is 0 ~ 100 % and “0 %”
means Class-AB, while “100 %” means Class-A.
Even if the Bias is varied, the RF output will not change
(up to the 75 Watts of maximum power under Class-
A), and you can change the bias safely even when you
are using a linear amplifier.
In the FT-2000 (100 W version) and FT-950 , this
indicator always shows “0 %.”
TEMP
This indicates the temperature (measured) of the final
amplifier FETs’ heat sink.
The measured temperature range of this meter is 0 ~
100 °C, and above 80 °C is the “Red Zone” tempera-
ture range to be avoided, so as to ensure a safe operat-
ing temperature range. When the temperature rises
above 80 °C, the fan speed will increase by a factor of
four, providing a significant increase in air flow. The
heat sink temperature may rise appreciably during
Class-A operation on the FT-2000D (200 W version)
and FTDX5000, especially if the ambient temperature
is warm, and we recommend that you monitor the tem-
perature during Class-A transmission, adjusting the
Bias control downward (more toward Class-AB) if ex-
cessive heating is observed. A lower bias level will
cause less heat to be dissipated, thus reducing the heat
sink temperature.
SWR
This displays the SWR characteristic of the amateur
band that you are currently using, with points along
the graph indicating the frequencies that have been
measured.

41


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