Re: [time-nuts] questions on uncompensated crystal oscillators

In a message dated 7/4/2006 09:52:33 Pacific Daylight Time, [EMAIL PROTECTED] writes: Hello, Please excuse the fact that this is not what we all consider precise frequency. I am selecting crystals to use for a medium to high volume application. The basic criterion are: - used with a VLSI

Re: [time-nuts] Dithering vs. locking all the clocks to the OCXO?

>On 7/4/06, Magnus Danielson <[EMAIL PROTECTED]> wrote: >Actually, for these distances, pulling some fibre and do two-way time transfer >should not be too hard. Acheiving sub-nanosecond relative timing should not at >all be unfeasable but should rather be consider fairly easy. Do you mean easy fo

Re: [time-nuts] questions on uncompensated crystal oscillators

> The basic criterion are: > - used with a VLSI inverter based oscillator with >3.3 V supply, but somewhat high impedance output. An inverter is not specified for oscillator duty. It cannot be analyzed for this application on SPICE. It will never be a high precision oscillator circuit. (10

Re: [time-nuts] Dithering vs. locking all the clocks to the OCXO?

On Tue, July 4, 2006 19:18, Bill Hawkins said: > What causes the "atmospheric effects"? I'd expect radiation to > slow down a bit as it passes through water. Are there heat > effects as well? Does the density of the atmosphere change > enough to make a 10E-10 second delay possible? If so, it > see

[time-nuts] Hello Christopher Re topic 1. EROS -750- OVCXO

Hello Christopher The company that did make the OVCXO changed name But are still making the Crystal Oscillator you have, that is also used in the TrueTime GPS-DC Receiver Try the web page and on there you have the contact details http://www.electrodynamics.com/index.php Its hard to open u

Re: [time-nuts] Dithering vs. locking all the clocks to the OCXO?

> However, a quick guess would be the delay caused by atmospheric effects (I > don't think thermal noise would play a big role since the antenna is looking > straight up). Seems to me that thermal noise depends only on the resistive impedance of the antenna and input circuit. See Johnson noise. Or

[time-nuts] questions on uncompensated crystal oscillators

Hello, Please excuse the fact that this is not what we all consider precise frequency. I am selecting crystals to use for a medium to high volume application. The basic criterion are: - used with a VLSI inverter based oscillator with 3.3 V supply, but somewhat high impedance output. - fr

Re: [time-nuts] NPL Time & Frequency Club Meeting

John, NPL is right next door to Bushy Park http://www.royalparks.gov.uk/parks/bushy_park/ . Hampton Court Palace and River Thames are close by. I'm sure your family could find a lot to amuse themselves if you visited NPL. If you look at the enlarged map on the link provided, NPL is situated a

Re: [time-nuts] NPL Time & Frequency Club Meeting

Rob, It happens I will be in the UK that week, but I am not sure my 6 year old daughter would be welcome! I have bookmarked the site and will keep a watch on it because it may be that a future trip could coincide with a meeting, thanks for the post. John At 03:35 AM 7/4/2006, you wrote: >NPL

Re: [time-nuts] Dithering vs. locking all the clocks to the OCXO?

From: "Robert Lutwak" <[EMAIL PROTECTED]> Subject: Re: [time-nuts] Dithering vs. locking all the clocks to the OCXO? Date: Tue, 4 Jul 2006 10:34:01 -0400 Message-ID: <[EMAIL PROTECTED]> > Are these permanent installations or portable? If portable, how quickly do > they need to lock up to within

Re: [time-nuts] Dithering vs. locking all the clocks to the OCXO?

Are these permanent installations or portable? If portable, how quickly do they need to lock up to within sub-nanoseconds? In a permanent (or semi-permanent) installation, it's hard to beat GPS-steered cesium, with a loop-tau of DAYS to eliminate all the GPS jitter, ionosphere effects, etc. -

Re: [time-nuts] Dithering vs. locking all the clocks to the OCXO?

From: "Stephan Sandenbergh" <[EMAIL PROTECTED]> Subject: [time-nuts] Dithering vs. locking all the clocks to the OCXO? Date: Tue, 4 Jul 2006 14:49:19 +0200 Message-ID: <[EMAIL PROTECTED]> > Hi All, > > Earlier, I explained that my application require very good relative > stability between various

[time-nuts] Dithering vs. locking all the clocks to the OCXO?

Hi All, Earlier, I explained that my application require very good relative stability between various GPSDOs. A rough estimate of my requirements is: -Baselines of 100s of meters to 10s of kilometres. -Sub-nanosecond relative stability (this I forgot to mention earlier - thanks to TvB for remi

Re: [time-nuts] Linear Interpolator

Hi Ulrich, Thanks for the useful link. Regards, Stephan. -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Ulrich Bangert Sent: 01 July 2006 05:39 PM To: 'Discussion of precise time and frequency measurement' Subject: Re: [time-nuts] Linear Interpolator

[time-nuts] MSF 60KHz Transmission

Updated details on the MSF transmission in the UK can be found at www.npl.co.uk/time/msf/ It provides information on the signal coverage expected from the new Anthorn site (starts transmitting April '07) and some recent FAQs. Rob Kimberley [EMAIL PROTECTED] Skype: robkimberley Just a thought.

[time-nuts] British Horological Institute

Again, for UK readers, unless you are holidaying in our hot and sunny country (don't worry it never lasts!), the British Horological Institute at Upton Hall is opening its doors to the public on 28th-30th July for its annual Clock & Watch Show. For those of you who like the mechanical versions of

[time-nuts] NPL Time & Frequency Club Meeting

NPL (National Physical Laboratory) Time & Frequency Club hold their next meeting on 14th September at NPL Teddington. The meeting is free to all, but you need to register. Please see www.npl.co.uk/time/club for more details, and a registration form. Rob Kimberley ___