Re: [time-nuts] Allan Deviation question

A few cards accept a reference clock in the MHz range (usually under the term "Superclock"), but most wordclock inputs are made for the wordclock frequency itself, for example 48 kHz. An internal PLL (of varying quality) multiplies that up to a multiple of it for driving the converter and shift

Re: [time-nuts] Clocks for Audio gear

MailLists wrote: > Ashihara's tests were with music/voice, taking into account > psychoacoustics, for an average group of music savvy listeners, and > even music professionals. > As uncorrelated jitter is practically raising the noise floor, most of > it was masked by the signal, making it more dif

Re: [time-nuts] Clocks for Audio gear

Chris Albertson wrote: > If we are to believe the above paper,then those guys who claim to hear > pS jitter are wrong. Note that the jitter spectrum matters for its audibility. Ashihara et.al. used random jitter, and it is not very suprising that the sensitivity for random jitter is lower than f

Re: [time-nuts] Clocks for Audio gear

Hal Murray wrote: > As a practical matter, is clock jitter or phase noise from a typical > low cost crystal and decent board layout a significant problem in audio > gear? How hard is it to measure? The answer depends a lot on the circumstances (as usual). If you refer to jitter effects on a con

Re: [time-nuts] Best location for a GPS antenna...?

What about mounting the antenna on the side of the metal pole, with the top of the pole extending a foot or more above the antenna? The idea is to have the lightning bolt strike the pole, but not the antenna. The cable shield would need to be insulated from the pole, but grounded on entry to th

[time-nuts] Experience with THS788 from TI?

Hi all, I just discovered that TI makes a TDC chip called THS788, see http://www.ti.com/product/ths788 for more info. Interesting specs, but rather expensive. Has anyone from the list had a chance to experiment with this device? Cheers Stefan ___ tim

Re: [time-nuts] IEEE1588

> Chris Albertson wrote: > The combination of a network server and a GPS receiver is called a > "Grand Master". It is not expensive to set one up. Any low-end PC > hardware that has a real serial port and then a good timing grade GPS. > You can't get away from the need to have at least one GP

Re: [time-nuts] mixers for frequency measurement

ed breya wrote: > That was a very interesting article. It would have been nice if they > tried other devices in their custom version mixer too, like bigger > diodes. I think the commercial mixers are optimized for wideband use at > typical power levels, but one specifically for low frequency like >

Re: [time-nuts] Why these Crystal Frequencies?

13.5 and 27 MHz are usually associated with digital video. SD video with 720 x 576 has a pixel clock of 13.5 MHz, and the corresponding SDI bit clock is 270 MHz. Cheers Stefan -Ursprüngliche Nachricht- Von: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] Im Auftrag von B

Re: [time-nuts] 5370B Reference Output (was: 5370B airflow)

I got some more niggles regarding my 5370B after the sidepanel question (btw, thanks for your answers!): I have a spray of harmonics from the reference output. On this list it seemed to be agreed upon that the source was the 10MHz presence detection circuit, and the easy remedy would be disabli

Re: [time-nuts] Regarding time lab acquistion GPIB Need Help

Speaking of TimeLab, I just downloaded the most recent version 0.971, and it crashes on program start. The older version 0.940 didn't do that on the same XP 32-bit machine. Is that a problem others have seen? Cheers Stefan Von: time-nuts-boun...@febo.com

[time-nuts] 5370B airflow

I obtained a 5370B with the "bad socket syndrome" and restored it to working order. I was wondering about the side panels, though. One of the side panels is perforated for airflow, the other isn't. My version of common sense would indicate that the perforated one would have to go on the left si

Re: [time-nuts] Fluke PM6681 triggering

The PM6681 has an analog filter that you can engage with a button on the front panel. Have you tried using that? Stefan -Ursprüngliche Nachricht- Von: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] Im Auftrag von Rex Gesendet: Montag, 6. Juni 2011 00:42 An: Discussion of

Re: [time-nuts] Parts Selection

Hi, I have done this sort of stuff multiple times, and am prepared to do it again (in the basement) as long as my eyes are good enough and my hands steady. 0.5 mm pin pitch is certainly doable with a soldering iron. The trick is to not be afraid of shorting pins. I often pull a reasonable amoun

Re: [time-nuts] HG 414A Rubidium

Ebay 180632718950 Is it this one? Cheers Stefan -Ursprüngliche Nachricht- Von: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] Im Auftrag von Magnus Danielson Gesendet: Freitag, 25. März 2011 00:31 An: Discussion of precise time and frequency measurement Betreff: [time-nu

Re: [time-nuts] Thunderbolt setup

Chris Albertson wrote: > I think the best setup is to put a 1" iron pipe on the roof that is > taller then any other vents or pipes up there but not so tall you > can't reach and work on the top. Mount the antenna on that pipe and > run the cable trough the pipe, through the roof and then straigh

Re: [time-nuts] Function of cap to GND in isolation transformer circuit

The way these caps are wired does not isolate DC from the transformer. The purpose is obviously a different one. Two reasons spring to mind: 1. If the caps are wired close to the connector, and Ground means the metal enclosure, then the caps provide RF continuity between cable shield and enclos

Re: [time-nuts] Getting GPIB to work on HP5382B Universal counter

Dave Baxter wrote: > As my old college tutor kept trying to drum into us, the programs > purpose and function should be easily read in the comments. The "code" > is the translation from your comments, to get the machine to do your > bidding. > Document what you do, in the source comments, line b

[time-nuts] Richard Thompson's Book "Crystal Clear", is it worth it?

Hi all, there's a book published by Wiley: http://eu.wiley.com/WileyCDA/WileyTitle/productCd-0470046066.html I might want to buy it if it is worth it. Has anybody on the list cast an eye on it yet? Cheers Stefan ___ time-nuts mailing list -- time-

Re: [time-nuts] Measuring ADEV with a PM6681 or CNT-81

. Tom Tom Duckworth 510-886-1396 -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Heinzmann, Stefan (ALC NetworX GmbH) Sent: Friday, October 24, 2008 2:03 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Measuring ADE

Re: [time-nuts] Measuring ADEV with a PM6681 or CNT-81

of precise time and frequency measurement Betreff: Re: [time-nuts] Measuring ADEV with a PM6681 or CNT-81 Heinzmann, Stefan (ALC NetworX GmbH) wrote: > So you are proposing to do a kind of simulated time stamping by using a > reference PPS signal and measure the time distance betwe

Re: [time-nuts] Measuring ADEV with a PM6681 or CNT-81

Re: [time-nuts] Measuring ADEV with a PM6681 or CNT-81 Heinzmann, Stefan (ALC NetworX GmbH) wrote: > Thanks, Tom! > > Apart from the specifics with TimeView, how does one go about measuring ADEV > with a counter that does have a dead-time? Are there > tricks that can be played, either wi

Re: [time-nuts] Measuring ADEV with a PM6681 or CNT-81

hortly. They are the experts for this question. Tom Tom Duckworth 510-886-1396 -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Heinzmann, Stefan (ALC NetworX GmbH) Sent: Thursday, October 23, 2008 10:12 AM To: time-nuts@febo.com Subject: [time-nuts] M

[time-nuts] Measuring ADEV with a PM6681 or CNT-81

Hi all, I hope you can clear up some confusion that I have regarding ADEV measurement. I was under the impression that you need a counter that is able to timestamp each rising edge of the clock under test, or equivalently measure period time continuously with no dead time. Now, while the CNT-90