Specifications

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.
