[ARC5] Programmable Oscillators

[Dennis Monticelli]

Dave,

Keep in mind that these digital oscillators often have high phase noise in
addition to rich odd harmonics.  For harmonic filtering I would suggest a
simple two section LC low pass.  The output section of these oscillators
has a low Z so you can design the low pass for low Z terminations.
Unfortunately, there is nothing you can do about the phase except try to
buy those oscillators that have this noise specified or you know were
intended for a noise critical application.  For some of our uses the phase
noise won't be a big deal.  But if the oscillator is going to multiplied up
to VHF then the phase noise is going to rear its ugly head.

BTW, these oscillators are commonly available surplus.  You many wish to
check out the webpage for Anchor Electronics and download a pdf of their
catalog.  They have all kinds of small parts for builders, including some
crystals and oscillators.  Just don't expect vintage parts.  I visit this
little store in my area regularly.  Good people.  I have no affilation;
just a long time happy customer.

http://www.anchor-electronics.com/

Dennis AE6C


On Sun, Feb 10, 2013 at 7:50 AM, David Stinson <arc5 at ix.netcom.com> 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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