I don't know for sure which category the Ball/Efratom MGPS
(as found in the MFS-XXX Modular Frequency Standard frames) is
in yet.... But the MGPS has a screen labeled "Current Leap Second",
that according to the manual:
"The display indicates the date and time of the current leap second.
Leap second data are hourly updated by GPS satellite transmission
(automatically).
A leap second can also be programed by the operator. To program a
leap second date and time, it is first necessary to select the
Edit menu by pressing the pushbutton "E"...."
I had to remove the lithium cell from my unit when I was servicing
it, so it is now displaying some hard reset default value:
Date 17 05 27 Time 23:59:00
If the "Current Leap Second" is indeed updated hourly, and my
display persists in showing a nonsense value, I am wondering if it
might be that it thinks it is in a manually programmed leap second
mode?
Perhaps I should manually program it to: 00 00 00 00:00:00,
and, hope it will get the clue that it is supposed to automagically
update the Current Leap Second from the GPS packets?
I would hate for my MGPS to miss the leap second party because the
manual was unclear.
-Chuck Harris
Tom Van Baak wrote:
I haven't looked at the raw data, but using the windows apps: a Trimble
Resolution SMT is showing the leap pending a Motorola UT+ is not. lady heather
is not
Interesting. I don't see any leap-pending from a Z3801A. (or a KS-24361)
Hi Hal,
It's not that simple. There are many different levels of leap second
notification.
1) IERS updates their ftp site (for bots) and sends email (for humans)
indicating
when the next leap second will occur. Days or weeks (and sometimes months)
later,
2) GPS ground control uploads almanac information to the satellites with updated
UTC parameters. Four values in page 18 of subframe 4 give the current UTC leap
second delta and also an optional future UTC delta, with a GPS week (LS_f) and
day
number (DN) when that future delta will be current. By definition the leap
second
will occur at the end of a UTC (not GPS) day.
...
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