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4. OPERATION
Operation of the amplifier is simplified through use of the TRI tuning aid, Auto-Operate function, and
automatic protection system, so you may begin using the amplifier immediately following installation.
However, to make full use of the amplifier's potential and to fully configure it to your local conditions,
we recommend that you thoroughly read the following information.
There are 14 ON LINE information screens, which can be selected by pressing repeatedly the NEXT
or PREV buttons (see fig.3-2). Their purposes and methods of use are described in the next 7
sections, 4-1 through 4-7.
4-1. Turning ON and OFF
In order to turn on the amplifier while the Main Power Switch (located on the rear panel) is on, press
the red ON/OFF button (located under the red LED on the front panel right-bottom corner) and hold it
on for about one second. The VFD will light at full brightness and the ON/OFF LED indicator above the
button will change the color from red to green. You will hear the blower and the optional external fan
starting at high speed for a second and then slowing down.
After successfully passing the initial amplifier self-tests, the ON/OFF LED begins flashing green while
the following inscription on the VFD remains lit:
WARMING UP: nnn s
(nnn above is the number of seconds remaining to readiness for operation)
A tube warm-up period of 180 seconds (3 minutes) follows. During this time the amplifier remains in
standby mode, so you can continue operating with the transceiver.
Pressing either the PREV or NEXT buttons during this period will result in changing the screen to one
of the 14 available information screens described in S.4-6 below. This will not influence the
warming-up process, so you may pass through all information screens, to monitor the High Voltage
value or the Exhaust Air temperature, for example. You may also return to the earlier screen to see
how many seconds are still needed until the tube cathode reaches its operating temperature.
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. Tube life is shortened by repeatedly
turning on and off the heater filament. 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 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 illuminate
automatically. The last used (one out of 14) information screen appears on the display, e.g.,
"WARMING UP: Ready.”
The bar-graph on the upper line always indicates the peak forward power (as well as during OFF
LINE).
In order to turn the amplifier off, press 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.
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