[time-nuts] Z3801A recovering

[Bob Camp]

Hi

If you look at the scale on the EFC plot, it’s likely showing you a 1 LSB change on the dac….

Bob

> On Mar 16, 2016, at 7:38 PM, Joseph Gray <jgray at zianet.com> wrote:
> 
> As I mentioned a while back, my trusty Z3801A, which has worked well
> for several years, went into holdover some time ago and stayed there.
> Until recently, I haven't had time to look into this. About 20 days
> ago, I did power cycle it to see if that made a difference. It did
> not.
> 
> In the middle of the night, last night (couldn't sleep), I decided to
> see what initiating a new survey would do. Since the unit doesn't lock
> to as many satellites as my Lucent with the newer Oncore, it took
> quite a while for the survey to finish.
> 
> I just got home from work and this is what I am seeing:
> 
> https://dl.dropboxusercontent.com/u/19599147/Z3801A.png
> 
> The good news is that the unit no longer telling me the PPS is
> invalid. It looks like it will be another long while before it comes
> out of Recovery (assuming the PPS stays locked).
> 
> I'm not the best at interpreting these graphs. At this point, should I
> be concerned abouth the spikey nature of the EFC graph, or will things
> calm down eventually? I assume that the PPS graph won't show until
> Recovery is done?
> 
> If this unit loses PPS lock again, or otherwise acts up, then I would
> assume it is a hardware problem, and I'll have to put it on the bench.
> 
> Joe Gray
> W5JG
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