Hi all,
I've just built a GPS-disciplined oscillator built around a 10544A, somewhat in
the style of the Brooks Shera unit, just to use around the shack. Problem is,
now that it's wired up, I notice the output is heavily distorted. It's clipped
on the negative side of the waveform, like an emitter follower without enough
headroom. The more I load the oscillator output, the heavier the clipping. When
I load the oscillator output with 1000 ohms, spec for this unit, almost 30% of
the waveform is clipped on the negative side. If I don't load it at all and
just put a probe on the output, it looks OK, but still some flattening of the
bottom half of the waveform.
I've got it wired up according to the datasheet, with +12V on the oscillator
and +20V on the heater. The grounds for the oscillator/amplifier, oven
controller, heater, and output are all tied together.
I know these are old units, and I'm wondering if this is a problem (for
instance in the output emitter follower amp) that others know about, before I
tear into it looking for a solution.
Thanks for your time,
Nick
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