[time-nuts] CSAC Project(was CSAC purchase)

Bob kb8tq kb8tq at n1k.org
Sun Jan 28 19:03:08 EST 2018


Hi

A GPS PPS output will (most likely) be more accurate than the CSAC
each time you go back to dock with the charger. A GPS module to do
everything you would ever want to do is a sub $100 sort of item. You 
would still need a bit of hardware to “glue” things together (but not a lot) 
and some code running on the MCU of your choice to supervise the process.

Accuracy wise, a GPS PPS is *very* hard to beat. 

Bob

> On Jan 28, 2018, at 6:19 PM, Ronald Held <ronaldheld at gmail.com> wrote:
> 
> Jim:
>     Hmm, I was kit thinking that way.   How rich could I get writing
> an app that is only used for CSACs?  Seems a small market ,IMO.
> Monitoring sounds easier thenSW to drive a display.
>     Ronald
> 
> There's a half dozen serial ascii commands to the CSAC, and a
> corresponding number of output messages. None are particularly "special"
> - I can't imagine needing a "display" for the telemetry, except perhaps
> as a novelty.
> 
> You'd want to periodically check the heater power, maybe?
> 
> I'd just expose a "diagnostic interface" on a CSAC based clock, and if
> you want to fool with it (or change the frequency, etc.), you hook up
> your external whatever.
> LE Bluetooth Serial port perhaps?
> 
> You could write an App for a phone to talk to it, and I'm sure it will
> be in the top10 on the iStore and GooglePlay within weeks. Your
> retirement funding is assured. <grin>
> 
> 
> 
> Mark:
>   Sounds like a good idea. I have none,but some Time-nuts have more
> than one.  Maybe one will loan one out?
>        Ronald
> 
> 
> 
> Bob:
>  Now there is a snproblem, as I own  nothing more accurate  the data
> dumping may prove usefulssni learn more.
>    Ronald
> 
> Hi
> 
> Yes, I have set up a CPU to dump all the data from a CSAC. Everything
> they list in their data sheet can easily be dumped via a standard UART
> interface. The serial protocol works exactly the way they describe.
> 
> There is no “built in clock” so no ability to dump the time and date. You
> can “improve” the frequency stability by sending whatever you want to the
> tuning word. What you send and when you send it is entirely up to you.
> The real issue is having something more accurate than the CSAC to
> compare to when you do the frequency correction.
> 
> Bob
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