User's Manual
ISO 9001:2000 Cert. N°4500/1
Version 1.1 SDT_ARK6_User_Manual_ENG_vATSC Page 85 of 206
5.10.1 Reflex Power Management
The ARK6 is provided with a reflex power control logic that prevents the amplifier stage from being
permanently damaged.
Figure 37. Reflex Pwr Management
If the output reflex power goes over its alarm threshold, the amplifier stage is automatically shut down
and the system reacts to this situation on the basis of the user selectable “Number of attempts”.
In the case that the user sets a “Number of attempts” equal to zero, the red “RFL Power High” LED is
turned on, the “Status” indicator shows “Alarm” and the amplifier stage is shut down by a “Reflex Pwr
High Alarm”.
In the case that the user sets N as “Number of attempts”, where N is different from zero, a self test is
conducted to determine if the system can be successfully restored. The red “RFL Power High” LED is
turned on, the “Status” indicator shows “Warning” and the amplifier stage is restarted N times. The
delay between two consecutive attempts is fixed to 10 seconds. At every RF ON/OFF the “Ampli status”
indicator will show “Reflex Pwr High Retry”. When the maximum number of attempts is reached, the
“Status” indicator shows “Alarm” and the amplifier stage is shut down by a “Reflex Pwr High Alarm”.
When the “Reflex Pwr High Alarm” is on the amplifier stage is permanently shut down. Once the
operator has carried out the necessary checks, the amplifier shall be manually reset through the button
“Reset”.
If the RFL power control mechanism is in warning state and the RFL power level doesn’t go over the
alarm threshold for 30 minutes, the amplifier stage is automatically reset.
The events associated to the reflex power control logic are the following:
“RFL Power Warning”: the reflex power level is higher than the specification and the “Number
of attempts” is different from zero.
“RFL Power OK”: RFL power goes under the alarm threshold.
“RFL Power Alarm”: RFL power goes over the alarm threshold for N times, where N is the
number of attempts specified in the Output page of the Java GUI.
“RFL RF OFF”: The output RF has been switched off because of either a RFL Power Warning (for
every attempt to restore the system) or a RFL Power Alarm.
“RFL RF ON ”N”: The output RF has been switched on after attempt number “N”.