Alpha Power 99 - Initial Set-up and Tuning

Sectio
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Initial Set-up and Tuning
Control Functions
(See front cover photo)
BAND Use to select amateur band desired (in MHz).
TUNE Sets output tank circuit to resonance. Higher frequencies
tend to tune toward the “0” end of the dial scale, while
lower frequencies tend to tune further toward the “100”
end.
LOAD Sets amplifier plate loading and determines the power level
at which best efficiency and linearity are achieved. In
general, loading is heavier at greater scale settings. Higher
frequencies tend to load more toward the “100” end of the
dial scale and lower frequencies toward the “0” end.
POWER Press ON to apply primary AC power to the amplifier or to
reset power if the plate overcurrent relay has tripped. Press
OFF to remove primary AC power.
OPR/STBY Operate places the amplifier in-line. With the 99 off, in
STandBY, or in warm-up with the WAIT LED lighted, the
amplifier is bypassed and the exciter is connected directly to
the antenna.
Metering LEDs &
Bargraphs
Separate bargraphs provide instantaneous full-time display
of peak values.
RF OUTPUT and
REFLECTED
Red and green “GRID” LEDs indicate, respectively, that
normal peak drive has been reached and the onset of
Radio Alpha Products Inc. ® Alpha 99
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