A small audio test generator is very useful for quickly tracing a signal through an audio unit. Its main purpose is speed rather than refinement. A single sine-wave signal of about 1 kHz is normally ...
The APSIN6000 portable RF signal generator specifies a phase noise -128 dBc/Hz at 1 GHz and a 20 kHz offset, harmonics of less than -40 dBc, and a resolution of 0.001 Hz from 9 kHz up to 6.4 GHz. An ...