[time-nuts] GPSDO Alternatives

Chris Albertson albertson.chris at gmail.com
Thu Dec 6 09:01:34 UTC 2012

Now you can see the problem with designs that require both a PCB and a
programmed uP.   Most people can't do either of these and those who can
typically are good at only one.   Then you find someone and after he looses
interest the project is dead and un-suportable.

So I was thinking of how to build a GPSDO that does not need a programmed
uP and would be so simple that a PCB would not be needed.  It shoud be
simple enough that after getting the parts could be built quickly by anyone.

The Arduino has a USB interface and both ADC and DAC and digital IO.  I
read about the concern about using USB power.  The Arduino can also be
powered by a 9V battery so it will continue to run if the USB power goes
away.  Or you can use a power cube (aka "wall wort")  Anyone can program an
Arduino even if you know nothing about uP.  It is VERY easy and the
software runs on Mac OS X, Linux and even Windows.

I would use a separate power supply for the OCXO as they take more power
and this needs to be cleaner than I'd expect USB power to be.

The question I have again is about a simple phase detector.

On Wed, Dec 5, 2012 at 3:28 AM, <EWKehren at aol.com> wrote:

> Chris
> There is a low cost solution and I have the input circuit perfect for GPS
> on a $1 gate array I have boards and am presently using Shera original
> version.  Would like to buy his version 402NE but have not been able to
> get a
> response from him. Have repeatedly asked for help on this list for some
> one to
>  step forward to write the uproc. program. No one. The total material cost
> would  be less than $ 25 PCB included  GPS receiver OCXO or RB would be
> extra. If  the FE 5680A with RS232 would be used cost is less than $ 15.
> There
> are now  PIC's out there that can also do the timing function reducing cost
> even more but  that will take more smarts.
> Bert Kehren
Chris Albertson
Redondo Beach, California

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