Exhibit 11 Page 4 of 12
Two of important information is visible –
screen current increased
, but still is within
the allowed limits. Turn
LOAD
knob slightly
in arrows direction
to get TUNE indicator
between arrows.
Display indicates
correct tuning
of the Power
amplifier.
Remember
Always use
TUNE
knob to get maximum output power. Use
LOAD
knob to get TUNE indicator on the
display to the middle position between both arrows. Simultaneously check if
Is graph
indicator stays
within the boundaries. Repeat both steps more times.
Proper operation mode of FU-728F requires the plate voltage to be close to 3 kV. If anode voltage
without RF power is much lower, watch the heating voltage, too. Normally, heating voltage must be in
boundaries from 8.5 to 9 V without RF signal (DSP3).
Heating voltage level is a reliable indicator of
correct AC selector adjustment
. If you see heating voltage lower than 8.5V without RF signal, change
primary AC voltage selector one step down (if possible). Conversely, if the voltage is higher than 9V,
try to move AC selector one step up (for example from 220 to 230 VAC). Check heating voltage under
full load (full output power), also. If the heating voltage without RF signal is OK but under full load
drops more than 1.5 V, this relates to the „soft“ AC network and is solvable only by „changing“ the AC
network...
Without RF power the plate voltage is OK.
Without RF power the plate voltage is 2.85 kV.
Check the heating voltage, too. If it is below
8.5 V, this indicates the need to change AC
selector position one step down (for example
from 230 to 220 VAC).
Type of supported TCVR and working
frequency are visible on the display.
AUTO LED is ON.
Type of supported TCVR and working
frequency are visible on the display.
AUTO LED is ON.
Type of supported TCVR and working
frequency are visible on the display.
AUTO LED is ON.
Type of supported TCVR and working
frequency are visible on the display.
AUTO LED is ON.
