Re: [time-nuts] While we are talking about Z3801's

[John Green]

When I removed it from storage, communication was gone. It took a very long
while to lock, but did so and maintained lock for a couple of weeks before
going into holdover. It then locked back for a while.
I definitely need to do more trouble shooting on it before I give up
completely. It was the best unit I have. I also have a couple of
Thunderbolts, but I don't consider them in the same class as the Z3801.
I see Z3801s for sale on eBay, but I am reluctant to buy one. They are at
an age where things are going to fail. Also, for my needs, a Thunderbolt
would suffice. I just like the Z3801 better and would really like to get it
going again.

On Sun, Mar 4, 2018 at 9:27 PM, Hal Murray  wrote:

>
> kb...@n1k.org said:
> > If still nothing, put a scope on the RX output of the serial chip in the
> > 3801. Do the same  for the TX input of the same chip.
>
> I think the Z3801A prints out a version string at power up.  Sometimes that
> helps debug the transmit path.
>
>
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Re: [time-nuts] While we are talking about Z3801's

[Hal Murray]

kb...@n1k.org said:
> If still nothing, put a scope on the RX output of the serial chip in the
> 3801. Do the same  for the TX input of the same chip.  

I think the Z3801A prints out a version string at power up.  Sometimes that 
helps debug the transmit path.


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Re: [time-nuts] While we are talking about Z3801's

[Bob kb8tq]

Hi

Basic troubleshooting: 

Check the regulator output voltages and repair as needed.

Basic serial troubleshooting:

Bring up a terminal program, loop back the serial with a jumper, see if you 
have 
a connection. 

If you do, issue basic commands, see what happens. 

Switch to likely baud rates repeat basic commands. 

If still nothing, put a scope on the RX output of the serial chip in the 3801. 
Do the same 
for the TX input of the same chip. 

…… dig on in from there. 

Bob

> On Mar 4, 2018, at 9:22 PM, Hal Murray  wrote:
> 
> 
> wpxs...@gmail.com said:
>> Hal, I can't communicate with it. That has been gone for a while now. 
> 
> I assume it worked at some point.  Did talking to it stop working at the same 
> time the frequency stopped tracking?  If so, I'd guess the CPU inside has 
> stopped working and isn't setting the DAC correctly.
> 
> 
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> 
> 
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Re: [time-nuts] While we are talking about Z3801's

[Hal Murray]

wpxs...@gmail.com said:
> Hal, I can't communicate with it. That has been gone for a while now. 

I assume it worked at some point.  Did talking to it stop working at the same 
time the frequency stopped tracking?  If so, I'd guess the CPU inside has 
stopped working and isn't setting the DAC correctly.


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Re: [time-nuts] While we are talking about Z3801's

[John Green]

Hal, I can't communicate with it. That has been gone for a while now.

On Sat, Mar 3, 2018 at 9:05 PM, Hal Murray  wrote:

> > Mine has quit achieving lock.
> ...
> > After reading about someone else's trouble, i wonder if my OCXO has aged
> > out.
>
> Have you checked the status page?  Is the GPS unit seeing satellites?
>
>
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Re: [time-nuts] While we are talking about Z3801's

[Hal Murray]

> Mine has quit achieving lock.
...
> After reading about someone else's trouble, i wonder if my OCXO has aged
> out.

Have you checked the status page?  Is the GPS unit seeing satellites?


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