Re: [time-nuts] Plot phase noise spectrum from DMTD measurement?

Hi, This makes sense. Thanks, Stephan. On 8 March 2011 21:08, Bruce Griffiths bruce.griffi...@xtra.co.nz wrote: Stephan Sandenbergh wrote: Hi, I recently noticed something interesting: The DMTD measurement gives a set of phase values x(t). From which fractional frequency y(t) is

Re: [time-nuts] Plot phase noise spectrum from DMTD measurement?

Hi, Cross-correlation a very clever idea! Thanks for the reference - Rubiola got some good sources of reference on his home page. One thing though - for a phase-noise kit one will probably need to replace the ZCD with a low-noise amplification stage of around 80dB to be to allow sampling at ADC

Re: [time-nuts] Plot phase noise spectrum from DMTD measurement?

If you can solve the aliasing problem then its easy to average the noise at frequencies fbeat-foffset and fbeat+foffset to synthesize the measured phase noise values with a beat frequency of 0 Hz as would be measured by a conventional phase measurement setup. Bruce Stephan Sandenbergh wrote:

Re: [time-nuts] Plot phase noise spectrum from DMTD measurement?

For conventional phase noise measurements at offsets in the (10Hz, 20kHz) range one can use a sound card with a low noise preaamp. Suitable sound card preamps with lower noise floors than Enrico's or Wenzel's designs can be built using readily available components. Wider bandwidths ( up to 1MHz

Re: [time-nuts] Plot phase noise spectrum from DMTD measurement?

Hi, Thanks this is good advice. Pointing the spectrum analyzer to fc + delta seems to be similar than deducing phase noise from the ZCD output since this would be with reference to (fc + delta) in any how? Provided the aliasing issue can be sorted. Regarding the aliasing issue - in order to

Re: [time-nuts] Plot phase noise spectrum from DMTD measurement?

Thanks, I'm familiar with the designs you posted to measure voltage noise ect. on you home page. These, with some modification, mainly removing the blocking caps, seems that it would do the trick. Cheers, Stephan. On 10 March 2011 10:50, Bruce Griffiths bruce.griffi...@xtra.co.nz wrote: For

Re: [time-nuts] Spacecraft Timekeeping

It is more a matter about that the involved technology could be ITAR classified or with other export restrictions. Ask Hughes and Boeing about the fine for export control violations in Intelsat 708 :) http://en.wikipedia.org/wiki/Intelsat_708 I think most people who work with rockets with

Re: [time-nuts] Spacecraft Timekeeping

El 10/03/2011 15:35, jimlux escribió: Heck, every time I buy parts at home, it seems the packing slip always has some sort of generic these parts may be subject to export controls notice on it. Yep.. those 10Meg resistors just might be a vital piece of an armament... This remembers me

[time-nuts] OT question Mini Circuits MAR-5?

Please excuse the off topic nature of this question, but I knew you guys would know. Is there, or was there a MAR-5 mmic? I thought I had some but when I look for specs, everything I am finding seems to skip over the MAR-5. If not, I'll have to dig into my mmic repository to see just what I do

Re: [time-nuts] MAR-5?

Doh! Never mind. It was the ERA-5SM I was thinking of. Boy, my age is beginning to show. Apologies. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions

Re: [time-nuts] MAR-5?

Hello, In fact there was once (in the '80s I think) a MAR-5, but last time I had to replace one, I was unable to find the datasheet either, and I replaced it by an ERA-5SM+ which was fine. Best regardzs, Jean-Louis Oneto - Original Message - From: John Green wpxs...@gmail.com To:

Re: [time-nuts] Plot phase noise spectrum from DMTD measurement?

Stephan Sandenbergh wrote: Hi, Thanks this is good advice. Pointing the spectrum analyzer to fc + delta seems to be similar than deducing phase noise from the ZCD output since this would be with reference to (fc + delta) in any how? Provided the aliasing issue can be sorted. Regarding the

Re: [time-nuts] Plot phase noise spectrum from DMTD measurement?

Without nulling the carrier the dynamic range of your ADC will limit the measurement system phase noise fllor. With a 300KHz beat frequency the post mixer preamp response need not extend to dc. Bruce Stephan Sandenbergh wrote: Thanks, I'm familiar with the designs you posted to measure

Re: [time-nuts] Plot phase noise spectrum from DMTD measurement?

S/N drops spectacular! Any probs to cut the noise-floor here? The text looks like art. - Henry -- ehydra.dyndns.info Bruce Griffiths schrieb: Stephan Sandenbergh wrote: Thanks, I'm familiar with the designs you posted to measure voltage noise ect. on you home page. These, with some

Re: [time-nuts] MAR-5?

On Thu, Mar 10, 2011 at 10:01 AM, Jean-Louis Oneto jean-louis.on...@obs-azur.fr wrote: Hello, In fact there was once (in the '80s I think) a MAR-5, but last time I had to replace one, I was unable to find the datasheet either, and I replaced it by Data sheet for MAR-5 is available here

Re: [time-nuts] Timecode clock for acution in UK

Thanks for pointing this out David. I already have a couple, and they are very nice - even keeping good time (domestically speaking - a couple of seconds per month!) without the EBU/SMPTE time code reference. (Locking to mains frequency (50 or 60Hz) is possible from a DIL switch on the back

[time-nuts] 50/60 Hz clocks

It perhaps the old story it is difficult for non-continental Americans have opportunities to buy valuable time-nuts equipment such as e.g. ‘Hewlett Packard Vintage Digital Clock Model 115BR-HO8’ seen on ebay recently… To temporary cheer up (?) myself I found (and bought) available on local

Re: [time-nuts] 50/60 Hz clocks

The exclusive solution feasible is: http://shop-emea.u-blox.com/abashop?s=274p=productdetailsku=553 Nice, as you can program it for PPS at 10KHz or some other frequency. More cheap, not so spectacular: Cirrus CS2000 PLL Locks on 50Hz or more - Henry -- ehydra.dyndns.info Cezary Rozluski

Re: [time-nuts] 50/60 Hz clocks

At 04:54 PM 3/10/2011, Cezary Rozluski wrote... Let us suppose I have Thunderbolt (I really have one) as a time/frequency source, but any other time-nuts recognized frequency source should by sufficient for the fun to drive old 50/60Hz stuff with the highest precision available (and for fun,

[time-nuts] Physics !

One Watt per square meter: http://www.ecd.bnl.gov/steve/watt.html === The ‘scandal’ of the kilogram http://physicsworld.com/blog/2011/01/by_matin_durrani_with_tunisia.html By Matin Durrani With Tunisia in political turmoil, parts of Australia under water and dozens dead in a Moscow

Re: [time-nuts] time interval with 10 ps resolution using cheap FPGA ?

I can't really add much to the questions - but I am very interested in the answer! Tristan On 11 March 2011 16:33, beale be...@bealecorner.com wrote: I was interested to see this 2009 Fermilab paper which claims a 10 ps (RMS) timing resolution in a TDC (time to digital converter) implented in

Re: [time-nuts] Physics !

Le 11/03/2011 01:24, J. Forster a écrit : One Watt per square meter: http://www.ecd.bnl.gov/steve/watt.html === The ‘scandal’ of the kilogram First, it’s vital for us as consumers to be confident about what we buy – we don’t want to be ripped off at the checkout with an underweight