[time-nuts] 58503A date code problem

Tom Van Baak tvb at LeapSecond.com
Sat Jun 21 19:44:08 UTC 2014


Hi Daniel,

What you have is a 58503A, the GPS time/frequency receiver (the 58530A is a GPS bandpass filter).

Note that today is MJD 56829. Exactly 1024 weeks (7168 days) ago was November 4, 1994. So this looks like a typical GPSDO week number rollover issue. It shouldn't affect the time or the 1PPS or the 10 MHz. One thing to try is manually setting the date using a SCPI command.

You can check www.realhamradio.com/GPS_websites_list.htm to see if anyone else has seen this on their 58503A or Z3801A receivers.

Did you notice it happened just today, or did it start happening maybe a few weeks ago?

I ask because recently we passed the 3/4 mark in the current 1024-week (19.6 year) GPS cycle. Specifically, on 2014-05-04 it was 768 weeks since the last rollover (1999-08-15) and 256 weeks before the next rollover (2019-03-31).

/tvb

----- Original Message ----- 
From: "Daniel Burch" <daniel.burch at ieee.org>
To: <time-nuts at febo.com>
Sent: Saturday, June 21, 2014 10:06 AM
Subject: [time-nuts] 58503A date code problem


> Hi All,
> 
> I have a HP/Symm 58530A that has the correct time, but date keeps
> defaulting to 1994, Nov, 4 after GPS Lock.  The pre-lock is 1996, so I do
> see a change when it locks, just to the wrong date.....time is exactly
> correct and tracks.
> 
> Any ideas?
> 
> Thanks!
> 
> db





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