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 (6) The output of the D/A CONVERTER U1 feeds SHAPER U31, which develops an
audio sinewave and shifts it all above zero baseline.
(7) MOD DEPTH CONTROL S6 sets the depth of modulation of the audio sinewave
from O-25 dB.
(8) AMPLIFIER U33, Q1 amplifies the audio sinewave and outputs the signal to
the linear modulator.
(9) The LINEAR MODULATOR CR3 amplitude modulates the RF frequency.
2-35
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