[time-nuts] 1PPS to 32.768 khz

Tom Van Baak tvb at LeapSecond.com
Wed Oct 19 00:54:42 EDT 2016

Hi Lee,

It's not likely you can directly multiply 1PPS up to 32 kHz, but it's easy to divide 10 MHz down to 32 kHz.
See http://leapsecond.com/pic/src/pd30.asm for a $1 PIC example.

A stand-alone 10 MHz OCXO or the simplest possible GPSDO would work for your digital clock project. Chris and Nick and many others have shared low-cost Arduino-class examples to the list over the years. Another example is the MCU-less James Miller design which uses a PLL at 10 kHz.

Contact me off-list some day when want a Trimble Thunderbolt; they are still available.


----- Original Message ----- 
From: "Lee - N2LEE via time-nuts" <time-nuts at febo.com>
To: <time-nuts at febo.com>
Sent: Tuesday, October 18, 2016 7:03 PM
Subject: [time-nuts] 1PPS to 32.768 khz

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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