[time-nuts] 1PPS to 32.768 khz

planophore at aei.ca planophore at aei.ca
Wed Oct 19 07:10:22 EDT 2016


Another option might be something like this:


it is a standalone ATTiny based device which uses a plug in Si5351a
synthesizer. Output frequencies from as low as 3.515 khz to a 100+ MHz
can programmed and can be GPS disciplined suing a GPS' PPS. There are
some limits on the PPS (i.e. very narrow will work).

Granted, phase noise and jitter in this example are a wildcard and I
couldn't comment on that with respect to your application.

The Si5351a synthesizer board uses a simple 27MHz crystal but can
replaced with a standard SMD 27MHz oscillator or TCXO. Once "burned"
in, can be very stable all on it's own and may be sufficient your needs.

cheers, Graham

On 10/19/2016, "Lee - N2LEE via time-nuts" <time-nuts at febo.com> wrote:

>First let me say this is first time I have posted to the group so go easy on me. :)
>Secondly I want everyone to know that you guys make me feel so NORMAL for
>wanting to use and understand accurate timing devices.
>I thought there was something seriously wrong with me now I know there are others
>affected with the same disease. hehe
>Now my questions.
>1. Does anyone know of a device that will take a 1PPS GPS timing signal and generate a 32.768 kHz sine wave output ?
>I have big digital clock that uses an 8 bit micro processor and an external 32.768 crystal. Obviously the external crystal is
>awful for accuracy.
>I have searched every where using as many search terms as I can think of and can’t believe there is not a device that performs
>this function.
>I have found a couple of Epson RTC chips that might come close that 1pps but I don’t think that corrects the 32khz just the clock time.
>2. 10 Mhz Freq Standard
>I am not in the same league as the majority of the list members and just starting to dabble in GPSDO stuff.
>I have tried to find a thunderbolt as a starting device but it appears those are either dried up or people want too much money.
>I wanted to get the opinion of anyone who has tried the Leo Bodnar GPSDO ?
>For the money it appears to offer a beginner a lot of features.
>Thanks and reading the daily digest of what you guys are working on.
>I have a feeling if I am not careful you guys could cost me a lot of money. hehe

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