[ARC5] Programmable Oscillators

[Bill Fuqua]

   Time jitter does change because by dividing  the frequency thru the flip 
flops you
average two cycle time jitters for each flip flop. And that is why the 
phase noise is
also reduced as well. There is a correlation between time jitter and phase 
noise (phase jitter).

73
Bill wa4lav

At 09:19 AM 2/11/2013 -0600, Francesco Ledda wr

ote:
>Time jitter doesn't change, but becomes half respect to the period, by 
>dividing by two. It is the same as you said, but in different words....
>
>Sent from my iPhone
>
>
>On Feb 11, 2013, at 1:08, Bill Fuqua <wlfuqu00 at uky.edu> wrote:
>
> > Most tube RF oscillators are class C and produce loads of harmonics 
> unless you take signal straight off the tuned circuit.
> > For lower frequencies use a 74HC4040 divider. When you divide a signal 
> with phase noise you reduce the phase noise and
> > jitter. Each divide by 2 reduces the phase noise by 6db.
> >
> > 73
> > Bill wa4lav
> >
> >
> > At 08:06 AM 2/11/2013 +1100, Leslie Smith wrote:
> >> My observation:  These are "digital" oscillators.
> >> The signal out is probably square wave, so think carefully about the
> >> harmonics etc that will accompany the fundamental.
> >> Analog RF work is a world separate from the signals in the digital (TTL)
> >> world.
> >>
> >> 73
> >>
> >>  Leslie Smith
> >>  vk2bcu at operamail.com
> >>
> >>
> >> On Mon, Feb 11, 2013, at 2:50, David Stinson wrote:
> >> > Here is a page from Digikey.  Lowest-price for through-hole
> >> > oscillator, programmed to order by them is $4.10 in quantites of 1.
> >> >
> >> > http://tinyurl.com/b6kxgeo
> >> >
> >> > I haven't ordered any yet but will soon.
> >> >
> >> > I'd go with the 5-Volt type for the bigger rail-to-rail swing.
> >> > Some even have "Tri-state" control pins so switching is easy.
> >> >
> >> > Output to a Pierce will probably need conditioning in some way,
> >> > but that should be easy.
> >> >
> >> > 73 Dave AB5S.
> >> >
> >> >
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