[time-nuts] George Carlin Time Words

Hi: Recently I've re-discovered the great comedy (actually he's a jester, philosopher and poet) of George Carlin. It appears that each of his HBO specials was better than the prior one. Back in 1978 his HBO special George Carlin Again! DVD contains the What Time is it? monologue in chapter

Re: [time-nuts] George Carlin Time Words

At LANL in the weapons group, we had a unit of time called a shake that equals 10ns. I suppose that means two shakes of a lamb's tail is 20ns. -Bob http://en.wikipedia.org/wiki/Shake_(time) On Mon, Aug 24, 2009 at 7:55 AM, Brooke Clarke bro...@pacific.net wrote: Hi: Recently I've

[time-nuts] HP 5065A latest serial number

Great, Thanks for the help. Looks like 1992 was the last catalog offering the 5065A. Now, anyone having a 5065A or two let me know if they have a serial number above 2816A01693. Trying to see what the last 5065A sold had as a serial number. Best Regards, Corby Dawson cdel...@juno.com

Re: [time-nuts] George Carlin Time Words

IIRC, a lamb doesn't shake its tail once - always twice, quickly. Hard to imagine the survival benefit there. But it's been a long time since I saw a live lamb. Bill Hawkins -Original Message- From: Robert Darlington Sent: Monday, August 24, 2009 10:03 AM At LANL in the weapons group,

[time-nuts] Time security query

Group, The questions of network and radio security are being applied to industrial control systems, which is my field of endeavor. Control systems also require an accurate sense of time of day, to stamp the time of events occurring in the controlled process. GPS is the preferred way to get

Re: [time-nuts] Using cheap sound cards for measurements

james.p@jpl.nasa.gov said: [External clock at strange frequency.] That's an interesting idea. I would imagine that the clock going into the chip is probably some multiple of the sample rate (e.g. 48kHz*16*2 = 1.536 MHz), so you could pick the closest 1/N from 10 MHz and pump that in.

Re: [time-nuts] Using cheap sound cards for measurements

Hal Murray wrote: james.p@jpl.nasa.gov said: [External clock at strange frequency.] That's an interesting idea. I would imagine that the clock going into the chip is probably some multiple of the sample rate (e.g. 48kHz*16*2 = 1.536 MHz), so you could pick the closest 1/N from 10 MHz and

Re: [time-nuts] Time security query

b...@iaxs.net said: These time stamps are required by government regulations in some industries. Do you have a list of the industries and/or regulations and/or what they require? I know about the stock market. (That is, I know there are requirements but I don't know the details.) In terms

Re: [time-nuts] Time security query

Bill Hawkins wrote: Spoofing the time from a remote location seems impossible. Or is it just difficult? Security by obscurity is not secure. Continual time changes could confuse a control system that had scheduled activities, as well as mess up the trends and logs that record the history of the

Re: [time-nuts] Time security query

On 8/24/09 1:01 PM, Hal Murray hmur...@megapathdsl.net wrote: b...@iaxs.net said: These time stamps are required by government regulations in some industries. Do you have a list of the industries and/or regulations and/or what they require? Cellular and other wireless use precision

Re: [time-nuts] Time security query

Dear Bill, Bill Hawkins wrote: Group, The questions of network and radio security are being applied to industrial control systems, which is my field of endeavor. Control systems also require an accurate sense of time of day, to stamp the time of events occurring in the controlled process. GPS

Re: [time-nuts] Using cheap sound cards for measurements

Well, I've just ordered two $9.98 USB sound cards on good ol' ebay. It will take some time to get here from China. I'll however have no compunction about opening up and so forth. Maybe some secrets will spill out :-). Still will not beat the EMU 0202 probably but when wrecked by fiddling will not

Re: [time-nuts] Using cheap sound cards for measurements

Don One potential problem with most USB sound cards is the preamp. The gain of these is set by a front panel pot over a very wide range. Consequently the preamp gain cannot be all that stable. Unless these preamps can be bypassed they may limit the performance when used for measurements. Bruce

[time-nuts] Using cheap sound cards for measurements

Here is a backgrounder on the 44.1 KHz sample frequency. I dimly remembered that it was related to video. http://www.cs.columbia.edu/~hgs/audio/44.1.html USB audio is often outside the AES spec for frequency since the USB clock isn't easily related to 44.1 or 48. Some external DAC's won't lock to

Re: [time-nuts] Using cheap sound cards for measurements

I'll look for them! Don Bruce Griffiths Don One potential problem with most USB sound cards is the preamp. The gain of these is set by a front panel pot over a very wide range. Consequently the preamp gain cannot be all that stable. Unless these preamps can be bypassed they may limit the