The Model S1067A Audio Oscillator is a transistorized, compact, lightweight instrument that provides laboratory=-quality performance. Its construction assures high reliability and accuracy with a minimum of maintenance. The instrument is ideally suited for the maintenance of '""Private- Line", "Quik-Call", single-tone, and similar tone-operated two-way radio equipment. It can also be used to check the frequency response of audio Amplifier The unit is equipped with a unique 1 kc distortion Analyzer that is used with a Motorola AC Voltmeter (or equivalent) to simplify and reduce the time required to check the distortion level in receiver audio circuits and Amplifier This feature is used when making EIA SINAD sensitivity and quieting checks specified for most two-way mobile and base station equipment.