[time-nuts] More Allan deviation data
Didier Juges
didier at cox.net
Sun Oct 29 23:32:45 UTC 2006
Dr Bruce Griffiths wrote:
> Didier
>
> Unless you have a particularly poor 10811 it is likely that the measured
> Allan deviation is limited by the instability of your GPS receiver
> PPS output.
> With a good GPS timing receiver setup you should expect an Allan
> variance perhaps 5x lower than this as illustrated in Ulrich's article
> for the AMSAT journal.
>
> Bruce
>
>
Thank you Bruce, that is the kind of information I was looking for. The
Jupiter will have to do for now, I have two of the same model. I may try
a better antenna though.
I got a link to the gpskit.nl web page, with a lot of information on the
Jupiter, through an off-list message, and I will experiment with the
settings in the receiver (mask angle primarily)
It seems all I have left to do is find the best way to close the loop
(!) and try again against another 10811. I also still have a lot of
experimentation to do over temperature, and check the stability of my
distribution amplifier.
I have learned a lot in the last few days, thanks to everyone on
time-nuts who took the time to explain the details to me.
I have a lot left to learn and experiment with, but at least I am aiming
in the right direction :-)
Didier KO4BB
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