There is a difference of about 15 seconds between GPS time and
UTC time. GPS time does not include the recent leap seconds. The
GPS message includes the current difference between GPS time and
UTC. I don't know which time the JT modes use, probably UTC.
See:
<https://en.wikipedia.org/wiki/Global_Positioning_System#Timekeeping>,
and <https://en.wikipedia.org/wiki/Time_standard>. For an idea
of how complex the idea of time really is, see <https://en.wikipedia.org/wiki/Terrestrial_Time>.
The ideal programs to have automatically update the K3(S) and
KX3 clocks would be logging programs and utilities that are
running "all the time". RUMlogNG, N2MM, Win4K3Suite, etc.
When I built my BeagleBone Box, a low power computer using a
BeagleBone system board, I had to add a real-time clock. I chose
a high precision one, the ChronoDot - Ultra-precise Real Time
Clock (v2.1) from Adafruit part# 255 = $17.50. I wanted
precision in case I wanted to run JT modes while out in the wilderness.
I just checked it and found it 23 seconds slow compared with
NTP. It has been at least 5 months since I synced the clock on
that computer, and probably a lot more. Not too bad for a clock
that runs off a button battery. (Hmmm, that describes my watch
too, but the ChronoDot is significantly more precise.)
73 Bill AE6JV
On 8/28/16 at 2:03 PM, [email protected] (Edward R Cole) wrote:
But if you are off the grid then some other time std is
needed. GPS time is probably the answer. I bought a GPS with
USB dongle for under $50 dollars which there is software to
update the computer time.
Now a utility on my computer with access to accurate time that
could be downloaded to my K3 once per day or once per week
would be nice. It could elicit the K3 Utility program to
connect and update the K3 clock, automatically. No change to
the K3 clock hardware would be needed.
------------------------------------------------------------------------
Bill Frantz |"Insofar as the propositions of mathematics
refer to
408-356-8506 | reality, they are not certain; and insofar
they are
www.pwpconsult.com | certain, they do not refer to reality.”
-- Einstein
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