[time-nuts] Z3801A EEPROM

[Joseph Gray]

Referring to this old post:

https://www.febo.com/pipermail/time-nuts/2011-December/061718.html

In particular, this statement:

"but If the RTC in the receiver is not set or its battery has failed,
and the reference year stored in EEPROM is also wrong, the receiver
may select the wrong 20-year window."

Does anyone know where in the EEPROM the reference year is stored and
in what format? I thought that while I have the unit on the workbench,
I might also get it on the current 1024 week cycle. I'd also do the
spare unit I just traded for.

Yes, I'll add a battery pack as well :-)

Joe Gray
W5JG
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] Z3801A EEPROM

[Joseph Gray]

Magnus,

Yes, I know that is how it works. I was just curious if anyone knew
how and where that information was stored in the EEPROM. I thought it
might be nice not to fool around with trying to set the date before it
queried the satellites, to avoid the 1024 week issue. If I could
update the EEPROM, I'd be good for at least this 20 year cycle.

I know, this issue doesn't come up often, unless the unit get's power
cycled, which isn't often (usually years). But thinking about the
small stuff is what makes me hang around with everyone else here. This
came up recently because of my troubleshooting a flakey Z3801A and the
fact that I traded for another Z3801A.

Joe Gray
W5JG

On Fri, Mar 18, 2016 at 3:42 PM, Magnus Danielson
 wrote:
> Joe,
>
> On 03/18/2016 02:33 AM, Joseph Gray wrote:
>>
>> Referring to this old post:
>>
>> https://www.febo.com/pipermail/time-nuts/2011-December/061718.html
>>
>> In particular, this statement:
>>
>> "but If the RTC in the receiver is not set or its battery has failed,
>> and the reference year stored in EEPROM is also wrong, the receiver
>> may select the wrong 20-year window."
>>
>> Does anyone know where in the EEPROM the reference year is stored and
>> in what format? I thought that while I have the unit on the workbench,
>> I might also get it on the current 1024 week cycle. I'd also do the
>> spare unit I just traded for.
>>
>> Yes, I'll add a battery pack as well :-)
>
>
> As I gather it, the Z3801A relies on the GPS receiver board to give the time
> in correct form. Might be some setup it does.
>
> Cheers,
> Magnus
> ___
> time-nuts mailing list -- time-nuts@febo.com
> To unsubscribe, go to
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
>
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] Z3801A EEPROM

[Hal Murray]

jg...@zianet.com said:
> I know, this issue doesn't come up often, unless the unit get's power
> cycled, which isn't often (usually years).

A long time ago, I had to set the date on a  Z3801A.  It's been power cycled 
several times since then without troubles.

So either setting the date is good enough, or there is a battery in there and 
a really old battery is good enough to hold over a short power loss (as 
compared to being on the shelf for months).




-- 
These are my opinions.  I hate spam.



___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] Z3801A EEPROM

[Magnus Danielson]

Joe,

On 03/18/2016 02:33 AM, Joseph Gray wrote:

Referring to this old post:

https://www.febo.com/pipermail/time-nuts/2011-December/061718.html

In particular, this statement:

"but If the RTC in the receiver is not set or its battery has failed,
and the reference year stored in EEPROM is also wrong, the receiver
may select the wrong 20-year window."

Does anyone know where in the EEPROM the reference year is stored and
in what format? I thought that while I have the unit on the workbench,
I might also get it on the current 1024 week cycle. I'd also do the
spare unit I just traded for.

Yes, I'll add a battery pack as well :-)


As I gather it, the Z3801A relies on the GPS receiver board to give the 
time in correct form. Might be some setup it does.


Cheers,
Magnus
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.