OT accurate time checks?

[Dave Plowman (News)]

You, obviously.

[Dave Plowman (News)]

But even FM goes via a digital path these days. Which introduces a delay.

[The Natural Philosopher]

It seems that peter is correct.

Opera is delving into the OS to make a lot of system calls that affect how timer interrupts happen. The more tabs or windows open in opera, and the more you move them around, the more it buggers up windows own clock.

Basically its a windows bug. Timer events should pre-empt all other interrupts at the highest priority. And no system calls should be able to affect this.

It doesn't affect the RTC of course, and an NTP client run often enough to keep the clock in synch would probably help.

But windows is a pile of shit anyway.

Just one more reason to use Linux, and put anything windowsish in a sandbox that you don't care about.

Now, if only Corel Draw and RhinoCad ran on Native Linux...

[Martin Brown]

But the claim here is that the PC clock runs *fast* by 4% when Opera is running. Most normal system level blocking of interrupts results in the system clock losing a few ticks not creating virtual bogus ones!

The RTC meanders on its own sweet untrimmed way.

Therein lies the problem. A lot of useful software for Windows only.

Regards, Martin Brown

[tony sayer]

Rugby not these days?, Anthorn in Cumbria is occasionally down for maintenance those system's and Tx's require a bit of that, more so than others. If your on their maillist they'll tell you when its off-air ...

However since its moved further North some in the South of the UK have reported poor reception and sometimes your reception might be very marginal and it might be just the difference between which way the clocks rotated in relation to the transmitter. Most all employ a ferrite rod device which normally has a directional properly..

Do bear in mind that Anthorn (60 kHz) is to do with setting the time whereas the Droitwich Longwave transmitter on 198 kHz is used as a frequency standard 1 part in 10- to somewhere near the speed of light in nought's ....

[Reentrant]

My cheapo Casio watch picks up the Anthorn signal at strength 5/5 in mid-Hampshire.

[The Natural Philosopher]

well the good news is that it takes about 10 secs to save/restore a virtual machine so when I am not using them I dump the VM and free up the RAM.

[dennis]

There we have the classic "I don't know the difference between D/A convertors and AtoD convertors" that is typical of TNP. Tells me I am wrong by talking about something unrelated. Now wait for the other people that can't read to join in.

[Mike Tomlinson]

En el artículo , Harry Bloomfield escribió:

'kinell. Why not just edit the registry by hand, which is all the VomitBasic script you cut'n'pasted (twice) does?

[dennis]

Well there will be 1/8000 of a second between samples. Then there will be the delay through the switches which can move you to a different time slot on a different 2M stream. So there could be a delay of 32 x 1/8000 of a second for each switch. Then there will be the A to D conversion which will have an analogue filter that could delay the signal a bit. I will let you add it up and see what you think is the correct answer.

There is a requirement for the total delay across the UK network but I can't remember what it is.

I do know that 21cn uses VoIP and that can add 20+ mS. That is enough to break FAX machines which is why you have to do special things to support FAX on VoIP networks.

[The Natural Philosopher]

Well we were talking about micrphones dennis There are no D to A converters in those, so its you who were talking about something else.

[Andy Burns]

Is it something at my end, or is everyone else seeing 17 separate "accurate time checks" threads? Has google groups found another way to pollute usenet?

[The Nomad]

Yes, thought that might be pan (which keeps crashing :-( )

Big Ben is the BELL not the clock nor the tower

[Mike Tomlinson]

En el artículo , Andy Burns escribió:

No.

Yes.

[Harry Bloomfield]

Rather oddly for such a lot of posts, I see it as one thread.

And reputed to be named after a bare knuckle boxer :D

[The Natural Philosopher]

ditto here

[dennis]

So your is a microphone for the deaf, convert to digital and throw it away.

[The Natural Philosopher]

Oh you are a card Dennis

[tony sayer]

Fine .. it was London that the majority came from all that screening by buildings doesn't do those frequencies much good...

[John Williamson]

So there are now *no* accurate radio time signals available in the UK, then, apart from the VLF and GPS systems?