The display will then show the following:
4.3 Warm-up
Press the STBY or XMIT key whilst in the "OFF" state to
begin the TWT cathode warm-up process (180
seconds). In this state power is only applied to the
TWT cathode heater.
"OFF" LED will have gone out.
WARM-UP LED will be lit.
Display remains unchanged.
4.4 Standby
If the STBY key had been pressed, from the "OFF"
state, then after 180 seconds the STBY LED will light
and the WARM-UP led will go out.
Display remains unchanged.
If there are no faults, the amplifier is now ready to go to
the transmit state.
4.5 Transmit
If the XMIT key had been pressed, from the "OFF"
state, then after 180 seconds the XMIT LED will light
and the WARM-UP LED will go out.
The amplifier will operate.
Amplifier fan will rotate at full speed.
Display will now show the output power in watts.
If the XMIT key had been pressed, from the STBY
state, then the amplifier will operate immediately.
4.6 Off
Press the "OFF" key and the Amplifier will return to the
off mode. The display will then show the following:
The Amplifier cooling fans will continue to rotate at full
speed for 120 seconds for TWT cool-down. After the
120 seconds the fans will slow to idle speed.
IT IS RECOMMENDED THAT THE POWER TO THE
AMPLIFIER IS NOT REMOVED BEFORE THE COOL-
DOWN HAS BEEN COMPLETED.
4.7 Fault
If at any time a summary fault occurs, the fault
indicator will be lit and the amplifier will leave the
"transmit" state.
Pwr
Pwr
150 W
Pwr
HBN6081-1
page 7
