[time-nuts] Auto TBolt TC Adjust

Ulrich Bangert df6jb at ulrich-bangert.de
Thu Jul 8 04:40:27 EDT 2010


Bob,

> More or less you would be making the TBolt do a dumbed down 
> version of what the Z38xx's do. 

If you have more detailed knowlegde about what the Z38XX do concerning their
time constant, would you share it with me?

There has been another thread here on TBolt's time constants. A TBolt that
has run for some weeks or so lives well with a time constant of 1000. More
than that is no improvement because then the loop cannot follow the dayly
temperature changes in a typical flat anymore. 

Best regards
Ulrich Bangert

> -----Ursprungliche Nachricht-----
> Von: time-nuts-bounces at febo.com 
> [mailto:time-nuts-bounces at febo.com] Im Auftrag von Bob Camp
> Gesendet: Donnerstag, 8. Juli 2010 03:23
> An: Discussion of precise time and frequency measurement
> Betreff: [time-nuts] Auto TBolt TC Adjust
> 
> 
> Hi
> 
> From looking at the numbers on a set of TBolt's it's apparent 
> that adjusting the time constant after they have been on 
> power for a while is a good idea. Something like:
> 
> Start at 10 seconds until pps is within 10 ns for 5 minutes 
> Run at 50 seconds until the same condition is met
> Bump to 200 seconds, check 
> Bump to 1000 seconds 
> 
> More or less you would be making the TBolt do a dumbed down 
> version of what the Z38xx's do. 
> 
> Before I go out and build up a gizmo to read TSIP and shoot 
> the commands to the TBolt,  I thought I'd see if somebody had 
> already made one of these up. Anybody have one of these already? 
> 
> Thanks!
> 
> Bob
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