On 05/12/2018 21:07, Dana Myers wrote:
Here are the original settings for the W32Time registry values:
MinPollInterval: 10
MaxPollInterval: 15
UpdateInterval: 360000
FrequencyCorrectRate: 4
and the NTP Client:
SpecialPollInterval: 604800
Hi Dana,
the Min and Max PollInterval configuration parameters are most relevant.
The units are log^2 seconds, so 6 is 64 seconds, 10 is 1024 seconds and
15 is 32768 seconds. So the default will poll the server between ~17
minutes and ~9 hours. I don't now what determines which end of the range
is used but I would guess it polls more often if it is having to make
large corrections. Once every 17 min isn't bad and should be good enough
for WSJT-X for most hardware, but if it waits 9 hr for a correction then
that is unlikely to be good enough.
For comparison, I believe the Meinberg NTP Client, by default, self
adjusts with a minimum poll interval of 64s and the interval increases
by powers of 2 up to 1024s once stability is established to keep the
clock within tolerance with the minimum rate of server polls.
Full details of W32Time service configuration here:
https://docs.microsoft.com/en-us/windows-server/networking/windows-time-service/windows-time-service-tools-and-settings#Configuration
73
Bill
G4WJS.
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