[ARC5] Programmable Oscillators

[Bill Fuqua]

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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