[Boatanchors] oscillator waveform

[Jim Wiley]

Well, I'm not really any kind of authority here, but it seems to me that 
any waveform other than a sine wave indicates the presence of harmonics 
of the fundamental, or other unrelated frequencies, or both.  If this is 
true, then anything other than a pure sine wave used to drive one port 
of a mixer would be likely to cause odd products, such as birdies.   
Others may have a different point of view. 


- Jim, KL7CC



Paul Kraemer wrote:
> A tecnical question for the group:
> Should the waveform from a hetrodyne oscillator in a receiver front-end be a 
> clean sine wave? Does it matter if it is a skewed or not symmetrical 
> waveform?
> I'm working on a receiver which seems (to me) to have a lot of birdies or 
> tweets and I'm wondering if that waveform could be significant contributing 
> factor.
> Alignment of the xtal oscillator "by the book" looking for maximum voltage 
> produces somewhat distorted waveform.
> A slight mis-tuning while observing the scope to make the waveform more pure 
> is possible on some bands but not all.
> Paul K0UYA 
>
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