THE MODEL 148A Wavetek Model 148A, 20 MHz AM/FM/PM Generator is a precision source of sine, triangle, square, ramp and pulse waveforms plus dc voltage. The waveforms may be controlled in symmetry as well as amplitude and dc offset. A built-in modulation generator can modulate frequency, phase and amplitude or modulation may be by an external source. The generator may be run in continuous mode or triggered for a single pulse or gated for a burst of pulses. Triggering and gating may be by the Model 148 built-in modulation generator or by an external source. The triggered and gated waveform start/stop point is selectable from -90° through +90°, Start/stop control plus dc offset control gives haverwave capability. The main output of waveforms may be attenuated and offset. A TTL sync pulse is available at main generator frequencies, and the modulation generator waveforms are available at fixed amplitudes. Frequency of both the main generator and the modulation generator can be manually controlled at the front panel or electrically controlled by external voltages. An external sync input (Option 001) located on the rear panel allows the instrument to be synchronized to an external signal source.