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This signal generator uses a free-running L-band VCO as it's source. It has a 1 KHz modulator, and a variable-level
amplifier (-20 dbm to 3
watts), making it suitable as a source for antenna range
measurements, which was it's design intent.
It is reasonably stable for an unlocked oscillator, drifting no more than 300 KHz or so over an hour's time. This is stable enough for instrumentation measurements (like SWR and attenuation). An example of it's use are these sample SWR measurements made on several 23cm antennas.
The small consumer electronics power module shown here is it's power source.