1 4
Pressing either the PREV or NEXT buttons during this period will result in changing the screen
to one of the I4 available information screens described in S.4-5 below. This action will not
influence the warming-up process, so you may pass through all information screens, for
instance to monitor the High Voltage value or the Exhaust Air temperature. You can also
return to the old one to see how many seconds are still needed for the tube's heater.
N O T E
When you intend to have a short operating break, it is better to leave the
amplifier in standby mode instead of turning it off. Tubes life is shortened
by repeatedly turning on and off the heater. However, if you
unintentionally power-off the amplifier, it is best to switch it on again
immediately. When the pause is short (up to one minute) and the cathode
is still warm, the warm-up period is shortened significantly, which
reduces the waiting time and prolongs the tube's expected life.
After the indicated period expires, the ON/OFF button stops flashing and lights green
constantly. If the auto-operate function has been selected to ON (see S.5-2), the green OPER
LED will light automatically. The last used (one out of I4) information screen appears on the
display, for instance: "WARMING UP: Ready".
The bargraph on the upper line always indicates the peak forward power (as well as during
OFF LINE).
In order to turn the amplifier off press shortly the red ON/OFF button. If you intend to have a
break for a long time, it is best to turn it off using the Main Power Switch (on the rear panel)
as well.
4-2. Changing Operate and Standby Modes
With the Auto-Operate function disabled (see S.5-2), the OPER button changes two modes
alternatively.
When Auto-Operate is enabled, the amplifier will be maintained to operate mode by default,
unless you use the OPER button manually to go to standby (then Auto-Operate is suppressed
temporarily). Pressing OPER again would restore the Auto-Operate feature.
This function can be enabled or disabled on the operator’s choice. When Auto Operate
function is disabled, the amplifier will shift and stay in STBY mode after each protection trip.
To restore the operation, the operator must press the OPER button manually.
When the Auto Operate function is enabled (see S 5-2), the amplifier will also shift to the
STBY mode on a protection trip, however it will return to the OPER mode after about four
seconds automatically. The operator does not need pressing any button to return to OPER
mode in this case.
4-3. Antenna change
By pressing the ANT button, the amplifier output can be switched between three antenna
outputs. The lights above the button indicate the current antenna selection. Selection
possibility for any one of the antenna outputs can be disabled if it is not used - see S. 5-3 -
Antenna outputs
assignment. Thereafter you will not be able to select free outputs
inadvertently, thus preventing no-load transmissions and possible damage.
C A U T I O N
To avoid damage (not covered under warranty) do not change antennas
during a transmission. Do not transmit into an antenna output (1, 2, or 3) if
it is not connected to an antenna or a dummy load.
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