[tacgps] Re: Real time clock

[John Ackermann N8UR]

Bob Smith wrote:

>Hi all --
>
>I recall a TAPR kit or product that I think was known as TOC (Total
>Oscillator Control???) which would sample the GPS, 1 PPS, signal and use it
>to discipline a VCXO??
>  
>
For various reasons, the TOC (TAC Oscillator Controller) never got off 
the drawing board.

Brooks Shera did something similar in concept in his GPS controller 
(http://www.rt66.com/~shera/index_fs.htm) and the surplus HP Z3801A GPS 
discplined oscillators you can pick up on eBay also use this idea (and 
add some additional smarts by predicting the oscillator aging rate to 
hold frequency during loss-of-lock).

John