[time-nuts] Z3801A Freq jumping

Mark C. Stephens marks at non-stop.com.au
Mon Jul 22 23:19:50 EDT 2013


George,


The Z3816A is 8 channel, the Z3801A is 6 channel.

What is the problem with the Z3816A?
EFC error?


-marki

-----Original Message-----
From: George Sintchak [mailto:wa2vnv at optonline.net] 
Sent: Tuesday, 23 July 2013 12:34 PM
To: Mark C. Stephens; time-nuts at febo.com
Subject: Re: [time-nuts] Z3801A Freq jumping

OK Marki, I have a Z3816 with a possible bad  5 MHz oscillator. Maybe I can swap out the GPS rcvr. I have to see if they are compatible. Does anyone out there know?
Tnx,
George


----- Original Message -----
From: "Mark C. Stephens" <marks at non-stop.com.au>
To: "Discussion of precise time and frequency measurement" 
<time-nuts at febo.com>
Sent: Monday, July 22, 2013 12:32 PM
Subject: RE: [time-nuts] Z3801A Freq jumping


> George,
>
> Looking at your graph, as far as I can see, the EFC jumps appear to be 
> tied to the TI
> From the graph, your hitting +/- ~750ns. Normally, one sees +/- ~50ns. nax
> (although one particular basket case I have goes up into the milliseconds 
> occasionally,
> It is a defective GPS module, I have proved this by swapping the module 
> with another unit and the fault follows the GPS module.)
> I am not sure of the mechanics of how the EFC follows TI, perhaps one of 
> the other members can chime in?
>
>
> -marki
>
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On 
> Behalf Of George Sintchak
> Sent: Tuesday, 23 July 2013 1:30 AM
> To: time-nuts at febo.com
> Subject: [time-nuts] Z3801A Freq jumping
>
> Hello all - Not sure what's happening to my Z3801A. Doesn't unlock, but 
> EFC jumping all over.
> Is my oven controller dieing? I did a reacquire satellites abt 10 days 
> ago - no difference.
> See plot below of the last ~36 days. Any thing to try - restart from cold, 
> etc ???
> George
>
> 





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