Re: [time-nuts] Bad date out of HP Z3805A

[Ben Hall]

On 11/1/2015 8:20 PM, Hal Murray wrote:

The 3801 has a command to set the date.  You can find the details in the
manual which is readily available.  You may have to set the date before it
gets the date from a satellite.  That may be easier if you disconnect the
antenna and then power cycle.


Thank you for posting this - my Z3801 now correctly shows a 2015 date:



thanks much and 73,
ben, kd5byb




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Re: [time-nuts] Bad date out of HP Z3805A

[Charlie]

Hal-

Sure enough, power down and ant disconnect were key. 

Many thanks.

Charlie

-Original Message-
From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Hal Murray
Sent: Sunday, November 01, 2015 6:20 PM
To: Discussion of precise time and frequency measurement <time-nuts@febo.com>
Cc: hmur...@megapathdsl.net
Subject: Re: [time-nuts] Bad date out of HP Z3805A


char...@drhabekost.com said:
> I did a system reset, and a new survey. The date on startup is 1/1/1996; It
> jumps to 3/17/1996 and stays there (over a week now). All other functions
> appear to be normal. Power off/on, no difference.

> Am I missing something? 

That sounds like the 1024 week rollover problem.

I don't have a 3805, but I had similar troubles with a 3801.

The 3801 has a command to set the date.  You can find the details in the 
manual which is readily available.  You may have to set the date before it 
gets the date from a satellite.  That may be easier if you disconnect the 
antenna and then power cycle.

-- 
These are my opinions.  I hate spam.



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Re: [time-nuts] Bad date out of HP Z3805A

[Daniel Watson]

Hi,

It just so happens I've been playing around with GPS week rollover on the
Tria GPS. I added an option to simulate the next rollover in 2019, and did
some experimentation with a REF-0. With this being a current topic in this
thread, I decided to do a quick write-up on it:

http://syncchannel.blogspot.com/2015/11/simulating-gps-week-rollover-with-tria.html

I stuck to GPS time instead of UTC and didn't bother to simulate some
unknown number of leap seconds that will have occurred by then. But perhaps
the simple tests I documented will be of interest to the list.


Best regards,

Dan W.

On Mon, Nov 2, 2015 at 1:58 PM, Gregory Beat  wrote:

> I believe Dan Watson's Tria GPS receiver project, emulating the Motorola
> UT+ GPS receiver, will have an audience not only for GPS rollover issues --
> but as constellation alternatives increase by 2020 (user choices).
> http://syncchannel.blogspot.com/2015_10_01_archive.html
>
> Heol Designs (France) has already proven that such a market existed for
> the older Trimble receivers from that same design period.
> http://www.heoldesign.com/index.php?module=products=catalog=14
>
> greg
> w9gb
>
> Sent from iPad Air
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Re: [time-nuts] Bad date out of HP Z3805A

[Gregory Beat]

I believe Dan Watson's Tria GPS receiver project, emulating the Motorola UT+ 
GPS receiver, will have an audience not only for GPS rollover issues -- but as 
constellation alternatives increase by 2020 (user choices).
http://syncchannel.blogspot.com/2015_10_01_archive.html

Heol Designs (France) has already proven that such a market existed for the 
older Trimble receivers from that same design period.
http://www.heoldesign.com/index.php?module=products=catalog=14

greg
w9gb

Sent from iPad Air
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[time-nuts] Bad date out of HP Z3805A

[Charlie]

I have used a  HP Z3805A for my shack for a number of years. I recently
wished to get the date output.  Hooked up my laptop, and found that while I
had a stable, in spec 10 Mhz output, I now have a date of 3/17/1996.

I did a system reset, and a new survey. The date on startup is 1/1/1996; It
jumps to 3/17/1996 and stays there (over a week now). All other functions
appear to be normal. Power off/on, no difference.

Am I missing something?

Thanks,

Charlie
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Re: [time-nuts] Bad date out of HP Z3805A

[Hal Murray]

char...@drhabekost.com said:
> I did a system reset, and a new survey. The date on startup is 1/1/1996; It
> jumps to 3/17/1996 and stays there (over a week now). All other functions
> appear to be normal. Power off/on, no difference.

> Am I missing something? 

That sounds like the 1024 week rollover problem.

I don't have a 3805, but I had similar troubles with a 3801.

The 3801 has a command to set the date.  You can find the details in the 
manual which is readily available.  You may have to set the date before it 
gets the date from a satellite.  That may be easier if you disconnect the 
antenna and then power cycle.

-- 
These are my opinions.  I hate spam.



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Re: [time-nuts] Bad date out of HP Z3805A

[Graham / KE9H]

Yes, you are missing 1024 weeks.

Google: GPS week rollover.

--- Graham

==

On Sun, Nov 1, 2015 at 7:19 PM, Charlie  wrote:

> I have used a  HP Z3805A for my shack for a number of years. I recently
> wished to get the date output.  Hooked up my laptop, and found that while I
> had a stable, in spec 10 Mhz output, I now have a date of 3/17/1996.
>
> I did a system reset, and a new survey. The date on startup is 1/1/1996; It
> jumps to 3/17/1996 and stays there (over a week now). All other functions
> appear to be normal. Power off/on, no difference.
>
> Am I missing something?
>
> Thanks,
>
> Charlie
>
> ___
> 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.
>
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