[time-nuts] Z3801A holdover

[Artek Manuals]

Joe

It would have been helpful to see the graph BEFORE you power-cycled if 
you still have that data stream

I would not jump to any conclusions at this point until the power supply 
voltages have been checked . Downloading the schematics from KO4BB.com 
of the power supply and oven control circuits will give you some insight 
. There are numerous test points on the power supply board which make 
reading the various voltages a snap.


The 1 PPS being invalid I believe points to the fact that the DO is out 
of whack not the receiver.

I see your unit now has 28,000 hours on it so it is no longer a spring 
chicken for sure
Dave




On 2/25/2016 9:09 AM, Joseph Gray wrote:
> Dave,
>
> Thanks for the tips. I also got a message off list telling me about
> the EFC issue and that I missed this discussion recently on the list.
>
> Last night, I power cycled the Z3801A. It has been running all night.
> Attached is the graph you requested. If I read this correctly, yes, it
> looks like the unit has maxed out the EFC voltage one way.
>
> Joe Gray
> W5JG
>
>
> On Thu, Feb 25, 2016 at 1:54 AM, Artek Manuals<Manuals at artekmanuals.com>  wrote:
>> >On 2/24/2016 11:37 PM, Joseph Gray wrote:
>>> >>
>>> >>I just took a look at my Z3801A that has been in holdover for some
>>> >>time. I have been too busy to do anything about it until now.
>>> >>
>>> >>Before looking at the receiver stats just now, my first guess was that
>>> >>the Oncore GPS board went bad. However, I see that it is currently
>>> >>tracking 4 sats. I also see that the 1pps is invalid. Does this still
>>> >>point to a failed Oncore board?
>>> >>
>>> >>Attached is a screenshot showing the receiver stats.
>>> >>
>>> >>I will open this thing up over the weekend to check voltages and such.
>>> >>Until then, any tips on where to look are appreciated.
>>> >>
>>> >>Joe Gray
>>> >>W5JG
>> >


-- 
Dave
Manuals at ArtekManuals.com
www.ArtekManuals.com

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