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a) LOCK

Once locked through this option, the amplier can be switched on, but it will not turn into

OPERATE state until entering the same menu and choosing UNLOCK. This feature is intended

to protect the amplier from children, or from other persons, not familiar with the equipment.

The locked state is indicated by a displayed image of a key.

b) GAIN

N O T E

Inappropriate use of this function may reduce the gain or the maximum

undistorted output power.

In fact, this selection controls the tubes plate load resistance achieved by AUTO TUNE procedure.

When HIGH is selected, a next AUTO TUNE will result in a higher than nominal load resistance,

thus there will be more gain, but less maximum attainable output power. When available drive

power is insufcient or when less output but better efciency are needed, e.g., for RTTY and

SSTV, this may be desirable and you may select HIGH also at a nominal mains voltage condition.

Selecting LOW would lead to the opposite result, i.e., lower than nominal load resistance, less

gain, and more power attainable. Of course, this requires more drive power, more plate current,

and more plate heat, which shortens tubes expected life. We do not recommend this selection

at normal mains voltage and never at increased mains voltage. You may use it in conditions

with lower than nominal mains voltage.

Departure from NORMAL selection should be mainly used to compensate for small line (mains)

voltage variations in order to maintain tubes efciency and linearity at deviated mains voltage.

However, when there is more than plus or minus 5% deviation from the nominal line (mains)

voltage, the voltage selector inside the amplier should be changed (see S2-2).

A LOW-NORMAL-HIGH change requires refreshing the USER tunings in order to take place.

c) CLEAR THE SEGMENT TUNING

Use this entry if you want to erase a single USER tuning. Choosing YES will restore the

DEFAULT tuning for the current segment and antenna at leaving the menu.

d) DISPLAY BRIGHTNESS

The display brightness can be adjusted through the left and right arrow buttons.

e) SOUND

You can turn ON and OFF the RCU internal beeper. When turned ON, the amplier will alert

you with a beep, or CW characters at the start and at end of some procedures, as warmup

and autotune. Every fault that would trip the protection also will be indicated by letter “F” in

CW.

f) ANTENNAS

To enter the antenna list, press the down button one more time when the marker is on the

last line.

Acom 2000R User Manual

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