11
5 FRONT PANEL
The following controls and indicators are present on the front panel:
5.1 Controls
BAND SWITCH
A nine position switch selects the desired frequency range. The operating bands are indicated in metres.
PLATE TUNE
Tunes the amplifier operating frequency. A chart of approximate starting settings is given in Table-1
LOAD TUNE
Tunes the amplifier output loading. A chart of approximate starting settings is given in Table-1
ON/OFF
Switches the AC power on and off. On initial switch on, the standby mode is enabled. Note also the
appropriate switch down sequence, given in Section 11.
OPR/STBY
Enables the amplifier once it has warmed up. In STANDBY mode, the screen voltage is removed and any RF
power applied to the input is bypassed to the output. If this switch is changed to OPERATE before the
READY light comes on, the FAULT light will turn on. This is not a fault, but it is better to leave the switch in
STBY position until the amplifier is ready to operate.
5.2 Displays
All the DX-3SP indicators are concentrated in a single, “moving light” display (
See Fig. 4
). The following
values are displayed (top to bottom):
Output Power
- Scale up to 5 kW, non linear.
Reflected Power
- Scale up to 500W, non linear.
Plate Voltage
- Scale up to 3.5 kV
Ig2
- Zero-centered display. Green: full scale 80 mA reverse screen current. Red: full scale 50 mA of positive
screen current. Above this value, the red LEDs will flash, warning to increase the loading, or reduce the drive.
Plate Current
- Scale up to 3.2
A.
Figure
4
Front Panel Display
RF OUTPUT POWER (kW)
REFLECTED POWER (W)
PLATE VOLTAGE (kV)
PLATE CURRENT (A)
Ig2
OVER
DRIVE
ON AIR
READY
SWR
FAULT