Acom 2000A Operating Manual page 19

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Fig.4-2 RCU display - MAIN MENU
The RCU display provides information about the current operational condition of the amplifier. You
can see three bar graphs: Forward Power, Reflected Power (RFL) and Exhaust Air Temperature.
Unless transmitting, only the last one is active, indicating the Exhaust Air temperature in degrees
C.
The whole HF spectrum is divided into 250 segments. Segment width increases with frequency
from 25kHz on 160m to 300kHz on 10m. You can use up to ten different antennas and tunings
per segment. This may be useful with narrow-bandwidth antennas.
The frequency segment on which the amplifier is tuned (in MHz) is indicated on the left-hand
side on the display. (28.300 to 28.600 in Figure 4-2 above).
Below the frequency segment, the number of the antenna in use is displayed along with its
name, and how the antenna was selected – manual or auto.
If the CAT connection to the transceiver is turned on, the transceiver type is shown at the left
side under the antenna field.
At the bottom left it is shown the tune type for the current frequency segment and antenna (in
Figure 4-2, DEFAULT is shown indicating as factory programmed). The amplifier may also be
user-tuned by means of the AUTO TUNE procedure as explained in Section 4-2.
Next to the tune type there is an indication for operate (OPR) or Standby (STB) mode.
At the bottom right there are three indicators available which warn you with yellow light when
the heater voltage, the plate current, or the drive RF power are approaching their limits.
c) ON AIR
If the VSWR of the antenna is acceptable (below 1.5:1) or you have fresh USER TUNINGS readily
prepared (see S.4-2), you may start operating the amplifier immediately after pressing the OPR
(Operate) button. The label STB on the display changes to OPR and you may transmit. The
bar graph on the upper line indicates the power fed into the antenna (forward power) and the
smaller bar graph below - the power reflected from the antenna (RFL). The difference between
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