david-tay...@blueyonder.co.uk said:
I was really interested to see how much effect the extra Ethernet latency of
the Raspberry Pi added in a real-world scenario. Thanks to Philip
Gladstone, I have now discovered a way of significantly reducing that
latency, so that the delay reported by NTP
From: Hal Murray
http://www.satsignal.eu/ntp/RaspberryPi-notes.html#EthernetLatency
Thanks for the tip. I did that to my R Pi and I see the same improvement in
round trip time.
What I don't understand is why the time offset as measured by an outside
system didn't change. ??
On Wed, Mar 25, 2015 at 3:22 AM, Hal Murray hmur...@megapathdsl.net wrote:
What I don't understand is why the time offset as measured by an outside
system didn't change. ??
NTP always and continuously measures the round trip time over the network
and assumes the one-way time is 1/2 the
For those of you near London with an interest in Greenwich, Harrison, and
pendulum clocks there's an event on April 18 that might be worth your time.
Harrison Decoded: Towards a Perfect Pendulum Clock
http://www.rmg.co.uk/whats-on/events/harrison-decoded
The HP101A and 5275A arrived today. The 101A warmed up in about an hour and
the crystal temp settled. It's now reading 98.50 against my 53131A
(med. stability option but uncalibrated).
I'm not sure what the spec is, or how long ago it was tuned - but even if
it was set recently, it's still
On Wed, 25 Mar 2015 09:46:05 -0700
Chris Albertson albertson.ch...@gmail.com wrote:
So if NTP always compensates for network delay why do you get improved
performance with less delay? That is because what messes up NTP is
uncertainly in the delay and likely it's the case that reducing the
What I don't understand is why the time offset as measured by an
outside system didn't change. ??
david-tay...@blueyonder.co.uk said:
Perhaps because NTP sees the offset in both send and receive packets and
therefore, like any other network delay, it is subtracted out.
The description of
Have two of the late 90's Lucent L106B boxes. They are isolated except
for power and GPS antenna connections.
I've read the manual and the archived timenuts material that I can find
with Google.
My test equipment is limited to a counter and an oscilloscope. Have
computers but no S/W. DVMs, of
Just a reminder, Sphere Research's annual Stuff Day is *next week*, April 3rd
(friday) and April 4th (saturday), 9am to 4 pm. There will be (literally) tons
of free stuff, plus some great test gear for dirt cheap prices. if you need more
info, please look here on our webpage:
b...@iaxs.net said:
Have computers but no S/W.
Is there a way to tell what's going on without hacking it from the basic
bits? Would really like to solve this problem.
If it's anything like the other Lucent/HP boxes, the serial port talks ASCII.
You should be able to talk to it with a
The public exhibition for this conference Ships, Clocks and Stars: The
Quest for Longitude is apparently coming to the colonies (Canada
Australia) this year, so us colonials might get a chance to feast on the
Harrison timepieces in all their glory. True clock p**n.
Tom Harris
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