Re: [soft_radio] Huff & Puff - Will It Generate Noise??

[FRANCIS CARCIA]

once the 8640B cavity warms up it is pretty stable and the loop filter has a long time constant. I only notice the noise of the update when the generator is cold and the shack is also cold. This is due the the high Q of the oscillator cavity. gfz 

n3hkn <[EMAIL PROTECTED]> 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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