It depends on the circuit, if designed correctly the drift is very
slow then it corrects.

Phase noise is rather rapid in nature that is why it typically
occupies a large range of frequencies. Typically is a cycle to cycle
difference of the oscillator causing it to scatter noise all over the place.

At 06:49 AM 4/19/2006, you wrote:
>With the Huff&Puff circuit I think that it constantly jumps the VFO
>frequency up and down as It looks at the counter output low digit (one
>and zero). If one it changes the frequency to get  a zero and if zero
>adjusts to get a one. Does this "little" frequency change cause phase
>noise from the VFO oscillator??
>
>Given the dirty output of affordable DDS VFOs the Huff&Puff seems like
>a great idea except for my non-engineering curiosity.
>
>Dick  N3HKN
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>Yahoo! Groups Links
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Cecil Bayona
KD5NWA
www.qrpradio.com

I fail to see why doing the same thing over and over and getting the
same results every time is insanity: I've almost proved it isn't;
only a few more tests now and I'm sure results will differ this time ... 

[Non-text portions of this message have been removed]



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