Re: [time-nuts] GPIB programming 'íb' style

and was in my concerns if I could actually write code for it not too differently from what I already know... Before I get one ;-) Thanks, that was exactly the starter info I was looking. Luis Cupido. ct1dmk. p.s. Many tks also to all the other replies. On 1/23/2012 5:49 AM, John Miles wrote

[time-nuts] GPIB programming 'íb' style

Is it possible to program under Windows, still using the old_style national instruments 'ib...' calls. when using USB-GPIB interfaces like prologix or others ? many tks. Luis Cupido. ct1dmk. p.s.(I only have real GPIB 'c' programming experience on MSDOS all the rest is using high level stuff

[time-nuts] seek info 'DSP technology' and other modules

. Any a light on the subject ? (or has catalogs/manuals of such) tks. Luis Cupido. ct1dmk p.s. Also for Kinetic Systems and LeCroy it seems hard too but I could find some stuff, but even so not what I wanted :-( ___ time-nuts mailing list -- time-nuts

[time-nuts] yet again more VMSK

Just read this one... I just wonder if I did anything that terrible in a past life to deserve reading this ... ;-) Recently on Microwaves and RF. http://mwrf.com/Articles/ArticleID/23644/23644.html lc. ct1dmk. ___ time-nuts mailing list --

Re: [time-nuts] Sine to LVDS

I had similar need some time ago and I found that a differential pair with two (pnp) BFR93 worked much better than any comparator(three or four tested, but not the adcmp604). (was a pll reference and I judged the impact of such observing the phase noise at microwaves). lc. ct1dmk. On

Re: [time-nuts] DDS'ery narrow scoped.

as so far I did not caught the idea clearly enough to start coding...) Luis Cupido. ct1dmk. p.s. No problem with the delay... ;-) On 7/21/2011 9:11 AM, Magnus Danielson wrote: On 21/06/11 12:48, Luis Cupido wrote: Yes that right. Is clear that I would have a 10ns jitter, So the catch would

Re: [time-nuts] DDS'ery narrow scoped.

Gerhard. This was an old thing I asked a month ago or so... Only the MSB of the accumulator is used to serve as reference to a pll. No sin or DAC involved ;-) Luis Cupido. ct1dmk On 7/21/2011 6:10 PM, dk...@arcor.de wrote: IMHO, that would require a sine table with a steerable number

Re: [time-nuts] DDS'ery narrow scoped.

Thanks Jim, Joseph already pointed me to a pdf in a previous post. Now it is digestion time... should I say congestion !!! those MASH delta-sigmas are killing me... lc. ct1dmk. On 6/23/2011 4:30 AM, Jim Lux wrote: On 6/22/11 3:36 PM, Luis Cupido wrote: I knew I must not have been the fist

Re: [time-nuts] DDS'ery narrow scoped.

I knew I must not have been the fist one to be looking for such. http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=4014919 (unfortunately I'm not ieee member and $30 looks more like a book price to me... not an article... bahhh!) Luis Cupido. ct1dmk. On 6/21/2011 11:48 AM, Luis Cupido

Re: [time-nuts] DDS'ery

the desired carrier frequency. Sometimes the MSB's toggle period is going to be shorter than it should be, and sometimes it's going to be longer. -- john, KE5FX -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts- boun...@febo.com] On Behalf Of Luis Cupido Sent: Monday

Re: [time-nuts] DDS'ery narrow scoped.

is the first LO for an experiment in SDR radio at VHF-SHF region,(not HF). Luis Cupido. ct1dmk. On 6/21/2011 10:03 AM, Ulrich Bangert wrote: Luis, the information that you are concerned about close carrier spurs that will pass through the PLL's low pass filter is not precise enough: are you talking

Re: [time-nuts] DDS'ery narrow scoped.

Yes that right. Is clear that I would have a 10ns jitter, So the catch would be to find a scheme to spread spurs out or to push them away from carrier. Then they would not bother me (would not pass the PLL). lc ct1dmk. On 6/21/2011 7:43 AM, Javier Herrero wrote: But I forgot to add that

Re: [time-nuts] DDS'ery narrow scoped.

I've played with the core from altera for a while, but since I was only interested in 1 bit I'm now playing with my own code. Trivial variations on the plain old clocked accumulator architecture. lc On 6/21/2011 7:37 AM, Javier Herrero wrote: What it the topology you're using now? Also, I

Re: [time-nuts] DDS - Cosine v. Sine LUT

Hi Brent, A quarter table cos is exactly the same as a quarter table sin. Only backwards, and not telling which quarter it is makes it a quarter of either sin or cos. For one single output becomes irrelevant as you only need one. So I think it is just a matter of taste the name to call it. Luis

[time-nuts] DDS'ery

. Or am I missing something here ? Comments appreciated. thanks. Luis Cupido. ct1dmk. ___ 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 there.

Re: [time-nuts] DDS'ery

Forgot the sine table... I meant obviously ...an accumulator 'sine table' and DAC... lc. On 6/20/2011 3:46 PM, Luis Cupido wrote: Folks, a quick one... A DDS, that is an accumulator with a DAC followed by a low pass filter and comparator (zero crossing) to produce a square wave to drive a PLL

Re: [time-nuts] DDS'ery

to have nothing in the alias region for it to be ok. (not my application at the moment but will keep that in mind) Thanks guys... Luis Cupido. ct1dmk. On 6/20/2011 4:11 PM, Graham / KE9H wrote: Luis: No, not the same. The most significant bit out of the accumulator has the alias

Re: [time-nuts] DDS'ery

Well, if we really need to filter it out we better filter the MSB and square it again... Why having a DAC for ??? Right ? Luis Cupido. ct1dmk. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin

Re: [time-nuts] DDS'ery

any literature covering that ? Thanks. Luis cupido. ct1dmk. On 6/20/2011 4:52 PM, Javier Herrero wrote: To reduce the spurii due to quantization distortion. Here is an explanation, in Section 4 http://www.analog.com/static/imported-files/tutorials/450968421DDS_Tutorial_rev12-2-99.pdf

[time-nuts] DDS'ery narrow scoped.

to be done after and producing a square wave). Thanks for your patience. Luis Cupido. ct1dmk P.S. At the moment I'm testing on the bench with a real FPGA cyclone III with a 48bit dds at 100MHz fclock and at circa 6 and 18MHz output and it is not that bad. I got better than -60dBc in the desired

Re: [time-nuts] Darn you people....

both feet there... looking at sub Hz you're infected that's a fact ;-) Luis Cupido. ct1dmk. Bob Bownes wrote: First it was building a VE2ZAZ GPSDO with an 10881 I happened across. Next came the TICII's followed closely by the 5370B. Then the thunderbolt. Now it's time to break down and get

Re: [time-nuts] Darn you people....

have on a PLL. All that may fall below most practical needs(1), I agree... But in the timenuts spirit ought to be pointed out... right ? ;-) Luis Cupido ct1dmk. p.s. (1) folks running several Cesium stds don't be offended I'm not saying your needs are not practical :-) ;-) hi Bert

[time-nuts] chip scale Cs133 cell.

http://spectrum.ieee.org/semiconductors/devices/chipscale-atomic-clock Luis Cupido ct1dmk. ___ 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 there.

Re: [time-nuts] spur prediction DDS software

Jim, Bob, Henry, Brian, Thanks to all. Very good. yeap, I do work on matlab so I think there is plenty now to keep me busy ;-) tks. Luis Cupido ct1dmk. p.s.(what's cooking) I need a relatively narrow tunning range but absolutely free of close in spurs, willing to see if a modest size DDS

[time-nuts] spur prediction DDS software

Hi, Is there a DDS spur prediction software around ? I mean for an arbitrary DDS design, like I would implement with logic or fpga etc. A code where I can enter nr of bits adc bits etc. (not a thing for a particular analog-devices chip or other dds chip) tks. Luis Cupido ct1dmk

Re: [time-nuts] Software defined spectrum analyzer

Hi Don. I'm ultra curious of how they did it. How did they covered the full BW they have. Did you looked inside, or did they sent a block diagram? (...I was born curious... it is not a new symptom!) Luis Cupido. ct1dmk. Don Latham wrote: I have one of the original analyzers, and I'm quite

Re: [time-nuts] Software defined spectrum analyzer

As for the digital part I have no idea, but would not be surprised of that very simplistic single chip approach sound card chip and an USB micro to feed the control bits to the PLL chip... It may well be a very very simple thing hardware wise. ...hence, I'm still curious ;-) Luis Cupido. jimlux wrote

Re: [time-nuts] GPS simulator,

Hi, The fact they refer that atmospheric s/n degradation and dropouts etc being replayed precisely lead me to think this is just a spectrum rec/play machine (no mod/demod of any kind) like the ham-oriented time machine but for GPS. http://www.expandedspectrumsystems.com/prod2.html Luis

Re: [time-nuts] GPS simulator,

But they mention software to generate sequences. Hummm... right... so I think we need to look inside one to be sure what it is... lc ct1dmk. jimlux wrote: Luis Cupido wrote: Hi, The fact they refer that atmospheric s/n degradation and dropouts etc being replayed precisely lead me

Re: [time-nuts] Simulation

many nice stories about gear that worked only with a certain set of parts way off the manufacturers expressed data... one day I'll drop a few here just for amusement. Luis Cupido ct1dmk. J. Forster wrote: FWIW, IMO any engineer who uses undocumented or uncontrolled parameters or instructions

Re: [time-nuts] rapid startup GPSDO

no further ;-) Reflock to 1pps is your thing. Take a look of all variants by VE1ALQ and G8ACE (there is also a japanese variation... can't recall). all those variants may use my reflockI 1pps CPLD config. Luis Cupido. ___ time-nuts mailing list -- time-nuts

Re: [time-nuts] rapid startup GPSDO

to the above timings depends on how much you want to average the 1pps. Having it fast it would obviously track the 1pps jitter. 'how good you need' - 'how slow it has to be' These timings are off course after your GPS starts producing good enough 1pps pulses. Luis Cupido. CT1DMK. P.S. Super cheap

[time-nuts] Info on MTI osc.

Does anyone has data on the MTI 230-0546-A OCXO (5MHz). ( If no datasheet, just pinout best guess may help ). Many thanks. Luis Cupido. ct1dmk. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin

Re: [time-nuts] Info on MTI osc.

Tks, Bruce, Tks, John, Looks that is it. (I could not find the info... must improve my googling skils hi). Not sure how to decipher the reference but at least I know it is a 5MHz and know what kind of performance to expect, in principle. Many thanks. Luis Cupido. ct1dmk. John Miles wrote

[time-nuts] Best OCXOs, phasenoise wise.

wenzels, BLIBEY, OACs and a few more. Not necessarily just 10MHz... other freqs are of interest too. Any generic heading info/help? Many Thanks. Luis Cupido. ct1dmk. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https

Re: [time-nuts] DCF77 clock with UTC display

on their web site... (it was 10 years ago I got it) More, I'm out of the official DCF77 range and it receives beautifully (I believe it is due to the fact they used a big rod ant) If it helps the find one I can take a picture of mine. Luis Cupido. ct1dmk. Rob Kimberley wrote: You could try Meinberg

[time-nuts] Simple PLL chips, gone ?

it). Are the simple ones gone obsolete, or simple no longer in the web pages ??? ok... I think you got the idea... I'm looking for the basic think... Any suggestions of what might be usable/available. Thanks. Luis Cupido ct1dmk. p.s. I know it doesn't matter to have a modern complex one as some

Re: [time-nuts] Symmetricom 5115A Phase Noise Allen Deviation TestSet on ePay

from low PN sources)... 40ke Cyc III fpga has more than enough multipliers and etc for the sort of conversions and correlations needed... and the display and fancy interface would happen in the PC. Anyone feels attracted to do some coding ??? Luis Cupido ct1dmk

Re: [time-nuts] CPLDs for clock dividers

anymore. Luis Cupido. ct1dmk. Gerhard Hoffmann wrote: Luis Cupido wrote: That is not by any means a CPLD. it is a big FPGA and I bet it would be doing a bazilon things besides the divider. It shares the CPLD's problems of ground and VCC bounce. The Virtex was completely empty otherwise

Re: [time-nuts] CPLDs for clock dividers

option to 'see' how it 'sounds'... and differences 'pop up' to your eyes/years just like that. ;-) Luis Cupido. ct1dmk P.S. I did a lot of exprimentation long time ago when I was palying with the LO for the DSN rx, where I was looking for phase noise to be quite low at 1Hz offsets. This to tell

Re: [time-nuts] CPLDs for clock dividers

You may try Altera. Quatus web 9.1 is 1.5Gb and painless to setup. https://www.altera.com/support/software/download/altera_design/quartus_we/dnl-quartus_we.jsp lc. ct1dmk. paul swed wrote: I also did the web install and need to go back and add more options. How painful. Enough to drive me

Re: [time-nuts] CPLDs for clock dividers

setup you might think of). Way better than TTL. Luis Cupido. ct1dmk. Matt Ettus wrote: Does anyone have any experience using CPLDs for very low phase noise dividers? You can get an XC9536XL from Xilinx for around $1, and I thought it would make a good divide by 2 through 10 device. Matt

Re: [time-nuts] CPLDs for clock dividers

Gerhard, That is not by any means a CPLD. it is a big FPGA and I bet it would be doing a bazilon things besides the divider. Hummm... not really adds to the original question I'm afraid ;-) Luis Cupido, ct1dmk. Gerhard Hoffmann wrote: I have done that with a Virtex4-SX on a ML402 board

Re: [time-nuts] CPLDs for clock dividers

) and Nothing Else inside. Luis Cupido ct1dmk. ___ 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 there.

Re: [time-nuts] OT: Practical PLL low noise?

Frank, You might want to take a look in here also. Hardly gets any simpler than this ;-) http://w3ref.cfn.ist.utl.pt/cupido/reflock.html Luis Cupido ct1dmk. On 02/02/10 16:50, francesco messineo wrote: Hello all, sorry for the OT, but I know there're many real electronic artists here

Re: [time-nuts] Test Equipment

But only starts at 5GHz :-( :-( Luis Cupido ct1dmk John Miles wrote: You could also get really hardcore and build the VNA described in DUBUS 4/2009 by HB9TXV. Very nice piece of work, usable to 30 GHz. -- john, KE5FX -Original Message- From: time-nuts-boun...@febo.com

Re: [time-nuts] Help identifying coax connector type

Hi Robert, ... 43 or BT43 (BT=British Telecom) is a private reference only for British. hi ;-) It is 1.6/5.6 for the rest of us. (patent is siemens afaik) Luis Cupido. ct1dmk. Robert Atkinson wrote: Hi Peter, They are Type 43 or BT43 connectors. 75R used in telecomms digital equipment

Re: [time-nuts] Help identifying coax connector type

Hi Glen, Looks indeed like an SMP but I believe it is a siemens 1.0/2.3 used on the DIN41612 backplanes (note the retention spring in the back to allow them to lock inside the 41612/M connectors shell). Luis Cupido. ct1dmk. p.s. don't know if 1.0/2.3 connectors will mate with SMP

Re: [time-nuts] Amatuer Radio Information

building/setting-up and operating) orders of magnitude higher than I could possibly handle. My 2cents to help changing the general misconception that above HF there is very little do do... On the contrary... many of us don't even have HF antennas Hummm... What is HF ??? ;-) :-) Luis Cupido

Re: [time-nuts] fast freq. synthesis schemes

Brian, Wow, a lot of nice reading I have here. Thanks. Luis Cupido. ct1dmk. brimda...@aol.com wrote: Luis wrote: I'm looking for the schemes used on the frequency synthesizers that change frequency in few microseconds time (or less) snip Does anyone know of some paper or tech notes from

Re: [time-nuts] fast freq. synthesis schemes

a prototype of that. The second one I must check how small would be the step... 1 MHz would be enough for a start. Thanks Luis Cupido. ewkeh...@aol.com wrote: Luis There is not really enough information to make a good recommendation. Is this a one off or is the plan to make multiple units, what

Re: [time-nuts] fast freq. synthesis schemes

My fear is in the loop bandwidth is a lot of BW as I need a wide loop for it to be fast. Okay, it sounds a nice path to investigate. tks. lc Lux, Jim (337C) wrote: On 10/15/09 5:56 AM, Luis Cupido cup...@mail.ua.pt wrote: Hi Bert, Thanks for the input. briefly; -Phase noise is not too

[time-nuts] fast freq. synthesis schemes

(millisencods or more). Info on fast stuff I can't really find. I'm thinking of experimenting on something along those lines so... all comments are welcome. Thanks. Luis Cupido. ct1dmk. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https

Re: [time-nuts] fast freq. synthesis schemes

. That is the nearly the full story. A lot more comments can come and I will be happy an thankful. Thanks. Luis Cupido. ct1dmk. Hi John. John Miles wrote: Pretuning is the right strategy, but for microsecond agility, YIGs may be the wrong choice due to their main-coil inductance. If I were

Re: [time-nuts] fast freq. synthesis schemes

are not to be considered here as all calculations are done much before during the so called setup time) So cleverness on board (i.e. microprocessor and soft) is not a problem for the application. My issue is RF and microwave simplicity ;-) tks for your good comments and articles. Luis Cupido. ct1dmk Lux, Jim

Re: [time-nuts] Newbie looking for GPSDO kit or Project sites

Hi, Depending how deep you want, to go you must note that this one from ve2zaz (btw which is a great design given it's simplicity) is a FLL not a PLL. (unlike most of the others that really lock the phase of the signal to the 10KHz or 1pps). Luis Cupido. ct1dmk. Roberto Barrios wrote

Re: [time-nuts] PLL question

Hi Dick, 'cause it may not integrate long enough... 'cause it may have poor phase noise... ;-) (it is however a very good question though, as one must be really sure what it does and then be motivated to improve it...) Luis Cupido ct1dmk. Richard W. Solomon wrote: Dumb question time

Re: [time-nuts] GPSDO project - 66.667MHz from 10MHz

to 10MHz you can use the same reflock I design and the configuration is kind of trivial (but no one asked for it before) and I can make a file for you. Luis Cupido ct1dmk. From: Bruce Griffiths bruce.griffi...@xtra.co.nz To: Discussion of precise time

Re: [time-nuts] GPSDO project - 66.667MHz from 10MHz

Nic, I think yes but I'm not sure, please check Darrel's VE1ALQ and NTMS(Kent Britain) for reflock I pcb's and/or kits (as I've not heard from them recently). I believe TAPR is no longer offering the reflock II kit :-( Luis Cupido ct1dmk. Nic McLean wrote: Hi Luis, Are kits available again

[time-nuts] 5370B yet again

Hi, I do have a HP5335A and after the many comments about the 5370 I'm curious if there is something I'd be better off with the 5370 instead of my 5334 I've read the specs of both but... better ask the experts ;-) Luis Cupido. ct1dmk. ___ time-nuts

Re: [time-nuts] OT: Verilog/VHDL discussion list created...

I believe it is to be ham or hobby oriented Am I right ? (If so some rewording of the list purpose might be adequate... thinking out loud...) Luis Cupido ct1dmk. Scott Newell wrote: At 12:29 PM 4/14/2009 , John Miles wrote: ... for those who would like to participate in HDL discussions

Re: [time-nuts] Frequency Divider

The CPLDs are programmed via the JTAG port. Suitable JTAG programming cables are readily availble. Or you can build one to use the LPT port of your PC using just a 74HC244. Luis Cupido. ct1dmk. ___ time-nuts mailing list -- time-nuts@febo.com

Re: [time-nuts] Frequency Divider

(adding a few bits to the original byteblasterMV for the additional features required) and it works just fine even with Cyclone devices. Luis Cupido. ct1dmk. Bruce Griffiths wrote: Luis Cupido wrote: The CPLDs are programmed via the JTAG port. Suitable JTAG programming cables are readily

Re: [time-nuts] Close-in phase noise (long reply)

Brian, Was there any particular reason to go from 5MHz to 20MHz in two steps ? couldn't be just one x4 stage followed by the filter (preferably xtal) ? Luis Cupido. ct1dmk. wa1...@att.net wrote: John- The BPFs in the 5 to 20MHz chain are just 7-pole LC filters with the goal of trying

Re: [time-nuts] Close-in phase noise question...

is against you so not sure if better or worst. Luis Cupido ct1dmk. (*) x12 x9 x3 x2 w/ 9th harm corner cube harm mixer if my memory serves me well wa1...@att.net wrote: Bruce- OK... So, linear operation does therefore seem to be the preferred way to operate these MMICs rather than operation

Re: [time-nuts] Designing and building an OCXO and GPSDO

Bruce, John, Tks for all your comments about that topic. really interesting. Luis Cupido. ct1dmk. Bruce Griffiths wrote: Luis Cupido wrote: Bruce, John, ... And at smaller offsets like 100Hz and less ? Shouldn't the improvement be even bigger ? Closer to the carrier we are dealing

Re: [time-nuts] Designing and building an OCXO and GPSDO

and etc. Am I right ? Luis Cupido. ct1dmk. Bruce Griffiths wrote: Luis The R+S FMU36 has a phase noise floor of around -143dBc/Hz (offset 10kHz) with a 10MHz input. Whereas the R+S FSU67 has a phase noise floor of around -133dBcdBc/Hz (offset = 10kHz) with a 640Mhz input

Re: [time-nuts] Designing and building an OCXO and GPSDO

anyway, Or then I have to live with what my spectrum analyzer show me (a tek 492, in my case). --- Rephrasing the question, how much better are the low frequency spectrum analyzers comparing to the microwave spectrum analysers (in phase noise I mean)? Any comments ? Luis Cupido. ct1dmk. P.S.(I

Re: [time-nuts] Designing and building an OCXO and GPSDO

by 10 maximum. How can they claim similar performance ?! --- Ok on the rest, tks. Luis Cupido. Bruce Griffiths wrote: Luis The latest spectrum analyser offerings from Agilent have similar phase noise floors for both the millimeter wave and low frequency spectrum analysers. However

Re: [time-nuts] I want a good micro-controller

There are any number of choices, including the PIC line, which everyone but me seems to love. Bill, You're not alone ;-) Luis Cupido. ct1dmk. wje wrote: My favorite for many uses is the Freescale MC68HC908QT4, or others in that series. Freescale provides a complete C development

Re: [time-nuts] I want a good micro-controller

ones... my 2 cents ;-) Luis Cupido. ct1dmk. ___ 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 there.

Re: [time-nuts] What is a Time-Nut grade Zero Crossing Circuit?

is crap compared to this... At least in my experiments. discrete but simple... sometimes super-duper ic's are not the best option. Luis Cupido. ct1dmk. p.s. my interest was wide band so filtering amplifying and clipping (by far the best solution) was not an option for me. Rick Karlquist wrote

[time-nuts] Home built Ammonia cell std !! / Home built cesium clocks???

We dont get much info/comments about this But what would an ammonia cell standard be able to do. I mean frequency/time wise. Maybe easier and simpler ? comments ? Luis Cupido. ct1dmk. (I understand the frequencies are much higher but that is not a problem, at least for me

Re: [time-nuts] Fast frequency counting question

Couldn't it be: digitizing, process the data with a sliding FFT (making a spectrogram) plus deconvolve with the system line broadening response, and if all chirps are equal then repeating the above N times for resolution increase. Luis Cupido ct1dmk. Pete wrote: Murray, I may be out

Re: [time-nuts] Fast frequency counting question

Right... Not necessarily an FFT, other transforms are quite well suited to this. FFT was just my quick way to let the idea out ;-). lc. Magnus Danielson wrote: From: Luis Cupido [EMAIL PROTECTED] Subject: Re: [time-nuts] Fast frequency counting question Date: Mon, 05 May 2008 00:08:07

Re: [time-nuts] Fast frequency counting question

of the information available. ... interesting topic :-) Luis Cupido. p.s. however even tens of thousands of measurements of 1ms windows is a few minutes !!! Bruce Griffiths wrote: Probably impractical as the sampling noise is so high that it will require tens of thousands of measurements

[time-nuts] simple GPS nmea display.

me to any simple program, must run on older machines (windows 98) be and free. I mean very basic stuff for sanity checks of system antena etc. Thanks. Luis Cupido. ct1dmk. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https

Re: [time-nuts] Simple NMEA Display

Hi Tom, That I know ;-) I meant something more visual :-) Tks anyway. Luis Cupido. ct1dmk. Tom Clifton wrote: From: Luis Cupido [EMAIL PROTECTED] Can anyone point me to any simple program, must run on older machines (windows 98) be and free. I mean very basic stuff for sanity checks

Re: [time-nuts] simple GPS nmea display.

Tks, Mike, It was something very similar Will try that one tks. Luis Cupido. ct1dmk. [EMAIL PROTECTED] wrote: Was it VisualGPS?? www.visualgps.net 73, Mike, N1JEZ A closed mouth gathers no feet - Original Message - From: Luis Cupido [EMAIL PROTECTED] To: Discussion

Re: [time-nuts] simple GPS nmea display.

Tested, It works great. tks. lc ct1dmk. [EMAIL PROTECTED] wrote: Was it VisualGPS?? www.visualgps.net 73, Mike, N1JEZ A closed mouth gathers no feet - Original Message - From: Luis Cupido [EMAIL PROTECTED] To: Discussion of precise time and frequency measurement time

[time-nuts] PC104 isa

forced '0' all the time) Looks that IO input is comming from elsewhere as onboard devices like LPT or COM work well I suspect a bridge config or whatever... Kontron support doesn't really help and I wonder if anyone has stepped into this before... Thanks and sorry for off topic. Luis Cupido. ct1dmk

Re: [time-nuts] PC104 isa

. :-( So it is not reading from isa !!! I'm interfacing an FPGA to it and got stuck with this issue. It works with a good old 486 though ;-) Thanks for help. Luis Cupido. ct1dmk. Stanley Reynolds wrote: - Original Message From: Luis Cupido [EMAIL PROTECTED] To: time-nuts@febo.com

Re: [time-nuts] PC-104 ISA by Luis Cupido

Tks Dean, Not yet ruled out a silly mistake (so thanks for the tips, double check it again)... but... as you saw on my previous post it looks like this is a peculiarity of this PC the south bridge or whatever as on others it seems to work fine. tks, for the book reference ;-) will look for it.

Re: [time-nuts] favorite microcontroller module?

???) - Someone blinking a led with a ARM or a black-fin etc. (just avoiding to learn 2 pic instructions !!!) - Someone doing a tricky job using a micro-controller to do something that is a simple logic job, CPLD or whatever. Luis Cupido. ct1dmk P.S.Wishing to be professional hobbyist... but the boss don't

Re: [time-nuts] GPS Locked and Unlocked Performance Comparison

not any real performance tests on it only some basic functional tests :-( ... I'm stuck to 1pps ;-) Luis Cupido. ct1dmk http://w3ref.cfn.ist.utl.pt/cupido/ Dave Brown wrote: There's a published design very similar to James Millers from Andy Talbot- http://www.frars.org.uk/cgi-bin

Re: [time-nuts] is there a best bet advanced hobbyist buildable GPSDOdesign?

in analog ?! So you end up with a slightly worst phase comparator and the less convenient analog filter :-( Or do you need to add a microcontroller and a DAC ? If that is the case, there goes off your complexity issue much higher than a simple CPLD. Luis Cupido. ct1dmk

Re: [time-nuts] is there a best bet advanced hobbyist buildable GPSDOdesign?

an analog signal to control the voltage input of the VCXO. Right ? Where you get that from ? If not by filtering your flip-flop output what else you have in between the 1pps and the VCXO ? CPU's DAC's if so how does your complexity arguments still apply ? Luis Cupido

Re: [time-nuts] is there a best bet advanced hobbyist buildable GPSDOdesign?

if that is similar, better or still worst than HC or AC. Yeap... Nice thing to test Hummm... I'm still thinking how to test such... :-) Luis Cupido. ct1dmk. michael taylor wrote: On Dec 12, 2007 7:33 AM, Luis Cupido [EMAIL PROTECTED] wrote: Very good, I do respect the usage of a bunch of CMOS

Re: [time-nuts] is there a best bet advanced hobbyist buildable GPSDOdesign?

Ok. I understand now what you suggest. Thanks for the explanation. Luis Cupido. ct1dmk. Bruce Griffiths wrote: Luis Cupido wrote: Bruce, No analog filtering of the D flipflop output is required. Now you got me lost. We were talking about a GPSDO, that is locking an VCXO on the GPS

Re: [time-nuts] is there a best bet advanced hobbyist buildable GPSDO design?

Scott, you have also: http://w3ref.cfn.ist.utl.pt/cupido/reflock.html lab grade consider using reflock II for kits I think TAPR still has those... Luis Cupido ct1dmk. Scott Burris wrote: Hi, Like many, I've acquired a fair amount of surplus test equipment off of Ebay which could use

Re: [time-nuts] is there a best bet advanced hobbyist buildable GPSDOdesign?

get through), or lack stability. Luis Cupido ct1dmk. http://w3ref.cfn.ist.utl.pt/cupido/ Bruce Griffiths wrote: Scott Scott Burris wrote: OK, so for the DAC piece, why not just use an NXP LPC ARM chip for the microcontroller, and use a 32bit PCM output followed by a low pass