[ARC5] Programmable Oscillators

[Francesco Ledda]

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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