[time-nuts] Z3801 lockin behaviour

Joseph Gray jgray at zianet.com
Sun Jul 23 20:03:26 EDT 2006


It shouldn't be going into holdover unless you are loosing the satellites. 
Where is your antenna mounted?

Since I last moved it, my Z3801A has been running continuously for about two 
weeks and has never gone into holdover. I sold my Cs unit recently, so I 
can't do a comparison like you are doing.

----- Original Message ----- 
From: "Magnus Danielson" <cfmd at bredband.net>
To: <time-nuts at febo.com>
Sent: Sunday, July 23, 2006 5:55 PM
Subject: [time-nuts] Z3801 lockin behaviour


> Hi!
>
> I have powered up my Z3801A and monitored the 10 MHz on a counter (with 
> fancy
> histogram and statistics) with the Cs as reference. The Z3801 is moving 
> around
> quite a bit and the SatStat shows that it hasn't really converged towards
> precission (the 24h time error prediction). Infact, it drops out of lock 
> into
> holdover every now and then. When it jumps in or out of hold over, a 
> "large"
> (50 mHz) frequency jump is clearly vissible. I have about 1 mHz of Allan
> Deviation and about 4 in Standard Deviation.
>
> I have made comperative measurements of my counter setup by hooking it up 
> to my
> Rb, and that is noticeably lower in noise.
>
> Is this to be expected or not?
>
> Any thoughts & recommendations?
>
> Cheers,
> Magnus
>
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