figuratively, to make adjustments in something already
operational so as to greatly improve or refine its
performance.
Super- means exceeding the
normal limits. Receive means to pick up
electronic signals and convert them into
sound or
pictures. To
tune, as used here, means to adjust radio instruments or circuits to the desired or proper
performance. A heterodyne is a
type of
receiver in which incoming radio
signals are changed in certain
ways so that they can be easily reproduced and amplified as audible sounds.