Re: [time-nuts] WWVB cheap chip saa6579 RDS decoder back to the chip

2012-11-15 Thread ehydra
paul swed schrieb: To the saa6579 As mentioned in the other thread. Simple to hook up. Cheap Requires 1000uv or more so that ends up making things more complicated. S/N is important, not so absolute amplitude. But in my case simply did not really work at 57 or 60 Khz. The chip looks for

Re: [time-nuts] WWVB cheap chip saa6579 RDS decoder back to the chip

2012-11-16 Thread ehydra
Hi Paul - If you can spend time on that: 1. Look for the different modulation spectrum between BPSK and RDS. The phase modulation angle is different, the bits are manchester encoded or such to get a hole on the carrier frequency (For the ARI carrier), the baseband is DBPSK. 2. Carefully

Re: [time-nuts] Tele Quarz Group OCXO

2012-03-02 Thread ehydra
Looks like one can open it without problems. - Henry Detlef Twesten schrieb: Hi, does someone know the TQTC 16-01A from Tele Quarz Group? I'd like to get the Pinout and the supply voltage to help an radio amateur in Germany. He tried it with 5V and the standard pinout, pin 3 supply, pin 4

[time-nuts] broadband MPX signal stereo

2012-03-14 Thread ehydra
Hi! I'm looking for a sampled wave-file from a radio receiver MPX-signal including the RDS frequency band around 57KHz. I searched the Net but found just nothing that worked. So I ask here. Maybe someone has the possibility to sample a couple of seconds. Thank you all! - Henry --

Re: [time-nuts] broadband MPX signal stereo

2012-03-15 Thread ehydra
) by the stereo deMPX and then by the audio processor. On Thu, Mar 15, 2012 at 2:08 AM, ehydra ehy...@arcor.de wrote: Hi! I'm looking for a sampled wave-file from a radio receiver MPX-signal including the RDS frequency band around 57KHz. I searched the Net but found just nothing that worked. So I

Re: [time-nuts] broadband MPX signal stereo

2012-03-16 Thread ehydra
Azelio Boriani schrieb: Yes, there is people who have what in the past was expensive test equipment and now can be bought by 1/10 of the original price. The problem is that you need someone who can record 2 seconds of a signal that is slightly beyond the actual sound card sampling capability. A

Re: [time-nuts] Xtendwave

2012-03-16 Thread ehydra
At least in the USA one can patent pending even the neigboor's cat. It looks in Germany we go now the same way. About 100 years ago one has to be shown a functional device for patenting it. I think this was a really good idea. - Henry Chuck Harris schrieb: I was of the understanding that

Re: [time-nuts] broadband MPX signal stereo

2012-03-16 Thread ehydra
I own a EMU0202 and when I use it with my laptop running on battery I can see in spectrum lab FFT the DCF77 at 77.5KHz and the GB time-code transmitter at 60KHz easily. The antenna is 1 meter of wire. Not bad for 100 bucks. I'm around 450km from DCF77 and maybe 800km from GB transmitter. If I

Re: [time-nuts] broadband MPX signal stereo

2012-03-16 Thread ehydra
Demian Martin schrieb: I have tested a number of soundcards and while the EMU 2020 has issues (serious jitter and noise from the USB interface) I can recommend the ESI Juli@ as having flat response and good SNR up to 90 KHz. It's a PCI card, no USB. I have measured the performance of FM MPX

Re: [time-nuts] WWVB BPSK Receiver Project? (fwd)

2012-03-17 Thread ehydra
Hi Marek - I don't know where you are in CZ. I'm on the boarder in DE near PL and CZ. The distance to DCF77 is about 450km and if I check the amplitude across 24h I see considerable very deep fading effects! I think it is useless as a phase-coupled time receiver. At least in specific

Re: [time-nuts] Temex LPFRS-01

2012-03-17 Thread ehydra
You must understand the difference between deionized and destillated water! I think often they sell deionized water of poor quality as destillated on gas stations etc. Much like destillated as a general synonym for the best water. If all fails, simple rain water is very good. Wait for a heavy

Re: [time-nuts] WWVB BPSK Receiver Project? (fwd)

2012-03-17 Thread ehydra
Marek Peca schrieb: This was almost the only reason for ferrite rod -- simplicity and attenuation of TVs, some LCDs, 50Hz etc. If you make the antenna about 10x bigger you can omit the whole ferrite. The only benefit of a ferrite loaded coil is the size of it! In ancient time radios had flat

Re: [time-nuts] WWVB BPSK Receiver Project? (fwd)

2012-03-17 Thread ehydra
In the end every antenna receives the EM wave! The EM-wave is the far field. The antenna works in the near field where a dominant component can be the E or M. That depends on the antenna. Between the near and the far field the field is converted and local Z0 highly complicated. As far as I know

Re: [time-nuts] WWVB BPSK Receiver Project? (fwd)

2012-03-17 Thread ehydra
No, there is a geometric saturation. You can't use the better permeability in reality. The optimum length to width relation is about 6 to 10 for ferrite rods. Here is a diagram: http://ehydra.dyndns.info/NG/time-nuts/Pettengill%20002.jpg This is one of the classics in my link list:

Re: [time-nuts] WWVB BPSK Receiver Project? (fwd)

2012-03-18 Thread ehydra
Poul-Henning Kamp schrieb: In message 4f64f279.4040...@arcor.de, ehydra writes: Marek Peca schrieb: This was almost the only reason for ferrite rod -- simplicity and attenuation of TVs, some LCDs, 50Hz etc. If you make the antenna about 10x bigger you can omit the whole ferrite. I

Re: [time-nuts] WWVB BPSK Receiver Project? (fwd)

2012-03-18 Thread ehydra
I wonder because ALL of the shown circuits in his pdf are AC-coupled. It is maybe possible to servo-loop with OpAmps but surely not worth the effort. Useful too as a Scope FET-probe. - Henry Poul-Henning Kamp schrieb: In message 4f65d971.8070...@arcor.de, ehydra writes: http

Re: [time-nuts] WWVB BPSK Receiver Project? (fwd)

2012-03-19 Thread ehydra
gary schrieb: Just meditating out loud, if you were to go push pull with a ferrite antenna AND you are winding it yourself, you could avoid the biasing resistors by putting a center tap in the antenna itself, then tie that center tap to an appropriate bias voltage. I haven't seen this done,

Re: [time-nuts] WWVB phase plots

2012-03-19 Thread ehydra
What makes me wonder: Why don't they adapt the DCF77 implementation? Is it the not invented here syndrome? At it looks like they never heard of Kasami sequences. - Henry Dennis Ferguson schrieb: On 18 Mar, 2012, at 10:52 , John Seamons wrote: They do talk about using the 11-bit Barker

Re: [time-nuts] DIY GPS/GLONASS project

2012-03-19 Thread ehydra
Yes, his whole site is interesting stuff. But the GPS was already mentioned here :-) Even the Andrews variant. - Henry Tom Van Baak schrieb: While researching Geraldo's GLONASS question I ran across an amazing set of pages. It's the best documented homemade GPS+GLONASS receiver project I've

Re: [time-nuts] WWVB phase plots

2012-03-19 Thread ehydra
Hm. I had a quick look at http://en.wikipedia.org/wiki/WWVB I cannot see why it won't work with the DCF77 scheme. The carrier is always on-air. Do I miss something? To low bandwidth of the transmitting antenna? Sorry, I didn't followed the thread in whole. - Henry Brooke Clarke schrieb: Hi

[time-nuts] Impedance measurement fitting algorithm

2012-05-23 Thread ehydra
Hi time-nuts! If I remember correctly here was a discussion about an older HP impedance measurement equipment. The one which is able to calculate a 6 ideal parts replacement circuit for the measured passive device. How does is it works? I would like to fit parts for simulation in SPICE. So

Re: [time-nuts] Paper about DCF77 performance

2012-06-13 Thread ehydra
Would be interesting if I can read it. As far as I know even the IEEE grants the right to the author of his paper to locate it on his own web-site for public download. Thanks - Henry paul schrieb: On 6/13/2012 3:46 PM, Daniel Engeler wrote: Hi, This is my first post to this mailing list.

Re: [time-nuts] Paper about DCF77 performance

2012-06-17 Thread ehydra
Hm. Is the paper now online or do I have to add it to my list of downloads at next university trip? Thanks - Henry Hal Murray schrieb: enge...@alumni.ethz.ch said: Building the best DCF77 receiver in the world :-) You have found the right place. :) -- ehydra.dyndns.info

Re: [time-nuts] Widdershins

2012-06-26 Thread ehydra
Bill Hawkins schrieb: Around 1530, it was considered very bad luck to walk around a church widdershins (see the Wikipedia article). I think it goes back earlier than that, to a time well before clocks. They wrote at Wiki: Because the sun played a highly important role in primitive religion,

Re: [time-nuts] Widdershins

2012-06-26 Thread ehydra
Jim Lux schrieb: widdershins derives from Middle low german weddersines from Middle High German widersinnes, wider=back + sinnes=in the direction of widersinnig means 'nonsense' = not useful in the common thinking. The german wider- means 'against something'. There is another german word

Re: [time-nuts] disciplining sound card

2012-07-08 Thread ehydra
Demian Martin schrieb: If you don't want a delta sigma ADC you can substitute a different kind but there will be tradeouts. Usually bit depth vs sample rate vs. accuracy. Any market overview available? A simple way to discipline a 22.5792 and a 24.576 VCXO to a 10 MHz reference would be

Re: [time-nuts] Zero-Crossing Detector Design?

2012-07-19 Thread ehydra
On the Bruce page there is a table with increasing stage amplification from low-level to the output. If this is the optimum for low jitter how does it connect to the well-known rf design philosophy to have the highest amplification at the first stage, not the last stage, to have maximum S/N ?

Re: [time-nuts] Zero-Crossing Detector Design?

2012-07-21 Thread ehydra
Interesting discussion but I must say I had several times a brain-problem here ;-) Am I right that for that this is in general not fully understood? Are there interesting papers? I'm interested here for two points: 1. What is the right threshold for a comparator and on what it depends? Looks

Re: [time-nuts] Zero-Crossing Detector Design?

2012-07-22 Thread ehydra
Maybe, it is on my list for the university IEEE download for months. And this is the only reference? I have seen some similar issues in a few BPSK receiver papers. Not for time-nuting but for S/N. - Henry Magnus Danielson schrieb: On 07/22/2012 01:39 AM, Bob Camp wrote: HI The Collins

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

2011-07-21 Thread ehydra
Your algorithm looks very much like the solution to the problem how to find divider values in a rf receiver having a very low IF and *not* full length divider chains for dividing all the needed reference frequencies. So how to find two values connected. Interesting. - Henry --

Re: [time-nuts] Sine to LVDS

2011-09-09 Thread ehydra
Hi Bruce - Do you have a reference to read on for this? Thanks - Henry Bruce Griffiths schrieb: Sub picosecond jitter is feasible if one cascades a series of low pass filtered limiter stages. -- ehydra.dyndns.info ___ time-nuts mailing list --

Re: [time-nuts] Sine to LVDS

2011-09-10 Thread ehydra
Hi! I'm reading on, so sorry for replying soon. Magnus, what is the next good paper? cheers - Henry Magnus Danielson schrieb: This paper is however only scratches the surface on bandwidth/gain analysis in balancing the added noise (per step) and added slew-rate gain (per step). --

Re: [time-nuts] Sine to LVDS

2011-09-10 Thread ehydra
Thanks Magnus! I have no access to IEEE papers. I read Bruce' pages already. - Henry Magnus Danielson schrieb: Oh, do read the Oliver Collins The Design of Low Jitter Hard Limiters IEEE transactions on Communications, Vol 44 No 5, May 1996 pp 601-608 Toss in this paper:

Re: [time-nuts] Sine to LVDS

2011-09-10 Thread ehydra
He he. For me Key West Florida is a synonym for status 'retired for fun' or because career end (because already earned enough money for the rest of life). - Henry Jim Lux schrieb: However, another search does turn up: Oliver Collins, who now lives in Key West, Florida, ... So maybe he'd be

Re: [time-nuts] [FS] 70MHz Vectron OCXO units

2011-10-13 Thread ehydra
Hi Peter - I sent you an off-list message but got no response. Please contact me. Thanks - Henry Peter Loron schrieb: Hello, folks. I have several new-looking Vectron OCXO units. They output a 70MHz sine wave. Vectron wouldn't give me the data sheet for them, but I do have the pinout. If

Re: [time-nuts] Low noise power supplies for time nuts circuitry

2011-11-22 Thread ehydra
li...@lazygranch.com schrieb: The bozos at Broadcom have actually patented using shunt regulation in their chips. Good luck enforcing that patent. Must be a joke or misunderstanding. Look for example in the datasheet of TCA440. A really old IC. In the internal circuit displayed is a diode

[time-nuts] DGPS@home

2011-11-24 Thread ehydra
Hi all! I wonder what would be reasonable location accuracy if two cheap same type GPS modules will be several meters apart? I understand that it involves statistical numbers. Any idea? Say for a small robot. Thanks! - Henry -- ehydra.dyndns.info

Re: [time-nuts] SDR GPS

2011-11-24 Thread ehydra
Pricey, but allows to fly on high-attitude/speed. The region where money ist not so important ;-) - Henry Poul-Henning Kamp schrieb: Has any of you played with this: http://www.sparkfun.com/products/8238 -- ehydra.dyndns.info ___

Re: [time-nuts] DGPS@home

2011-11-24 Thread ehydra
for position to increase the position accuracy. On Thu, Nov 24, 2011 at 1:01 PM, ehydra ehy...@arcor.de wrote: Hi all! I wonder what would be reasonable location accuracy if two cheap same type GPS modules will be several meters apart? I understand that it involves statistical numbers. Any idea

Re: [time-nuts] Low noise power supplies - dont' use Electrolytics

2011-11-27 Thread ehydra
I molt them in a high-power charge-pump. The same with WIMA MKS. At normal usage they will last forever and work even at low temperature whereas normal Al caps won't. - Henry gary schrieb: At sane temperatures, OSCONs are very good. Who runs their gear hot enough to boil water?

Re: [time-nuts] Help with TCXO

2011-11-27 Thread ehydra
Maybe the HC04 oscillates but the experimenter doesn't see it. Or misunderstood that ICs have to be seen from top, not bottom like transistors. It is better to use an HCU04. Even a 4069UB should work at 8MHz@5V. I would prefer 100K feedback and several stages AC-coupled. The 5V is nominal,

Re: [time-nuts] Help with TCXO

2011-11-28 Thread ehydra
A 50K picture should fit the problem. I successfully use 4000 series for amplifying a 5MHz PSK signal. The HEF4x is a little faster than HCFx. Or use a line-receiver if the oscillators is not buffered internal. - Henry Michael Malloy schrieb: its a shame i cannot post the picture i took

Re: [time-nuts] Help with TCXO

2011-11-28 Thread ehydra
Sorry. Read: Or use a line-receiver if the oscillators is buffered internal. - Henry Michael Malloy schrieb: its a shame i cannot post the picture i took is there any way to be able to send my oscilloscope picture its 800k thats the problem -- ehydra.dyndns.info

Re: [time-nuts] DGPS@home

2011-11-28 Thread ehydra
Hi Hal - Thanks for your efforts! I just settled down my GPS for the car on my desk (under a brick roof) and left it over night alone. Between evening and morning I wrote 4 locations on paper and later dumped it into Google. So this is a test case for ONE unit. It is a TomTom equipped with a

Re: [time-nuts] FE-5680A clock shaping (sine - square wave)

2012-01-02 Thread ehydra
Is it possible to sketch the circuit? I can SPICE it. Symmetry limiting is the holy grail and it is questionable if a discrete design is way better than one of the chips. Here is another limiter circuit (by Chris Trask):

Re: [time-nuts] FE-5680A clock shaping (sine - square wave)

2012-01-02 Thread ehydra
David schrieb: I could analyze it on SPICE but I suspect the real world construction parasitics will be what limits the performance. I just sketched it out in my notebook but I will see if I can post it somewhere. Is there a quick and dirty online schematic capture site? Scan it. I will

Re: [time-nuts] crunching numbers from XOR phase detector

2012-01-04 Thread ehydra
The XOR phase comparator is without feed-back and that simply means no dead-zone. This is consistent with literature on XOR PDs. It will of course have non-linearity which is improving with speed of the process technology. A 74HC4046 will be better than a CD4046. BUT the low-frequency noise is

Re: [time-nuts] Generell help on search web-objects. was: OT: Need datasheets on photomultiplier tubes

2012-01-11 Thread ehydra
Rex schrieb: You might want to join this Yahoo group where the question would be more on-topic... http://tech.groups.yahoo.com/group/GeigerCounterEnthusiasts The Photonis site is one of those flashy-looking places where you can only find useful information if someone has already told you

Re: [time-nuts] New unit of time measurement

2012-01-15 Thread ehydra
In Germany hand-used phones during drive are banned for several years now. I think it makes sense. Well, humanoids should think on it DIY but the reality is another. In China I've seen down-counting LED displays for the red sign. But this is just to simple for Europe. Badly. - Henry Mark

Re: [time-nuts] New unit of time measurement

2012-01-16 Thread ehydra
d.sei...@comcast.net schrieb: could write tickets when you had enough hits on your car... Worst offenders? BMW and Audi drivers... Here in Germany too. The worst drivers are the ones with license plates beginning with LB- AND driving Audi or BMW. LB means Ludwigsburg - a city near Stuttgart.

Re: [time-nuts] Simple Super Ripple Eater

2012-01-16 Thread ehydra
Here is a hand-corrected version: http://ehydra.dyndns.info/NG/time-nuts/Simple%20power%20supply%20ripple%20rejection%20for%20battery%20systems.zip - Henry John Lofgren schrieb: There have been discussions in the past about ways to reduce regulator output noise or clean-up oscillator or

Re: [time-nuts] mixers for frequency measurement

2012-01-19 Thread ehydra
Magnus Danielson schrieb: On 01/19/2012 09:31 PM, Don Latham wrote: Oh dear I had the wrong idea. Thought PIN's were designed for switching. There is a breed of ultra-fast diode for protection in MOSFET switching circuits like h-bridges. Any better? Interesting idea! If it works, it is new

Re: [time-nuts] How best to exchange Large files?

2012-02-21 Thread ehydra
I think most users have ADSL, where the problem is the low upload bandwidth. If the connection drops, the whole file is lost. The download is much faster and so there is a good change to save the whole file. If not: If the web-browser and the file-owning server understand reconect, one can

Re: [time-nuts] How best to exchange Large files?

2012-02-21 Thread ehydra
David schrieb: I used Bittorrent last time to do this because of the ease and reliability factor. There is no resuming since it does not work that way and the whole process was just set and forget. HTTP and FTP can usually resume aborted transfers as well but require explicit support from both

Re: [time-nuts] How best to exchange Large files?

2012-02-21 Thread ehydra
Robert Darlington schrieb: Typically you can resume ftp transfers with the reget command. It has to be implemented on the server. Interesting. There are tons of file sharing services on the web that are free. Why go back to the 1980s? Because the problem is to send the whole file at

Re: [time-nuts] How best to exchange Large files?

2012-02-21 Thread ehydra
Thanks David and all the others! - Henry -- ehydra.dyndns.info ___ 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] Back-list import, was: 10 MHz Oscillator comparison part II

2011-01-13 Thread ehydra
Hello all! I'm new here. What is the simplest way to make all the older messages appear in my local email program? So I can local search for topics. I'm using Thunderbird. Thanks! regards - Henry ewkeh...@aol.com schrieb: List A while back I proposed the Austron 2110 circuit. No

Re: [time-nuts] optically pumped frequency standards

2011-01-14 Thread ehydra
Hi! By modulating the laser diode current you can modulate the diode temperature. And that changes the wavelength. - Henry -- ehydra.dyndns.info Chris Caudle schrieb: On Fri, January 14, 2011 12:02 am, Bruce Griffiths wrote: Kernco, Symmetricom. Interesting reference, I was not

Re: [time-nuts] LVPECL logic for dummies (that would be Moi)

2011-01-23 Thread ehydra
I think you have chosen the worst output possible. CMOS is good but better is CML. With CML you generate constant-current load at the VCC supply. So lower back-induced noise! And suppression of the symmetrical noise to the next stage. This next input is a differential transistor stage. CML to

Re: [time-nuts] power spectrum of hard limiter output

2011-01-24 Thread ehydra
The classical approach is to heavily band-limit the input of an following hard-limiter. But would it possible to merge both functions in several stages of an IF-strip? I think most individuals cannot follow much of this idea but time-nuts have the same problem :-) My main interest is a

Re: [time-nuts] power spectrum of hard limiter output

2011-01-25 Thread ehydra
Yes, it depends. Sometimes noise lowers SNR, sometimes it improves. A similar scheme exists to improve ADC performance. If I remember it correctly, LTC owns a patent where they inject pseudo-noise with known properties, then the signal runs thru the ADC, then 'a picture of' the added input

Re: [time-nuts] power spectrum of hard limiter output

2011-01-25 Thread ehydra
Hi Bob - Yes. But coming back to the CMOS inverter multi-stage amplifier: Because of the absolute momentum signal level the first stages (=amplifier) sees it operates more linear than later more saturating stages. As long as the single one stage works linear, this stage will not change the

Re: [time-nuts] power spectrum of hard limiter output

2011-01-25 Thread ehydra
Hi Magnus - What book? This one maybe: Gardner F M PHASELOCK TECHNIQUES Wiley Sons 1966 - Henry Magnus Danielson schrieb: It goes towards sine as I recall it. The gaussian noise rubs of overtones. Gardner describes this in his PLL book. Setting up a nice sawtooth detector is no good when

Re: [time-nuts] power spectrum of hard limiter output

2011-01-27 Thread ehydra
Magnus Danielson schrieb: Hi, On 27/01/11 01:30, ehydra wrote: Hm Magnus - I heard of it as a standard text book but never looked inside. And not known that it describes limiter behaviour. Anyway. Now I have a version of 2004, 3rd edition, and cannot find the mentioned chapter. Please post

Re: [time-nuts] spur prediction DDS software

2011-01-27 Thread ehydra
The best once I found is this: http://www.holmea.demon.co.uk/FracN/Simulate.htm - Henry Luis Cupido schrieb: 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

Re: [time-nuts] Mass vs BTU Function

2011-01-27 Thread ehydra
Thermal energy in metals are measured in 'pro kg'. The rest is just calculation. From a practical standpoint I would use copper. You can solder and weld it more easely. Look for how head-fin spreaders work for CPUs. - Henry Perry Sandeen schrieb: List, Please help me with this physics

Re: [time-nuts] power spectrum of hard limiter output

2011-01-27 Thread ehydra
Magnus Danielson schrieb: On 27/01/11 20:19, ehydra wrote: I found chapter Appendix 7A Analysis of interference in a hard limiter There is a half page with a couple of formulas. Not much, not practically oriented. Only idealized hard-limiters. I'm interested in SOFT-limiters! Jim's problem

Re: [time-nuts] power spectrum of hard limiter output

2011-01-29 Thread ehydra
Hi Magnus - Well. I made homework for sure. Endless viewed websites what others had done. We all seek for the singularity of beauty in our art. At the moment this is a CD4007 or similar without AGC. Cheap, effective. Not oversized. I came from TCA440. One of the not many receiver chips where

Re: [time-nuts] spur prediction DDS software

2011-01-29 Thread ehydra
I don't know how good it has to be but have you considered the Si570 or even one of the bigger more power hungry candidates from silabs? Really easy to drive this chip! - Henry Luis Cupido schrieb: Jim, Bob, Henry, Brian, Thanks to all. Very good. yeap, I do work on matlab so I think there

Re: [time-nuts] Distributed DDS

2011-01-30 Thread ehydra
I'm not sure if I overview the problem correctly. Hm, why not run the cable back and measure the round time? Half this time und you know the delay of one way. Then you can shift this with a PLL away. A similar scheme is used in almost all modern PC clock distribution chips. A bunch of PLLs on

Re: [time-nuts] 10MHz to 80MHz frequency multiplier suggestions

2011-01-31 Thread ehydra
I suggest to ask LTC first for what is required. Personally I think one of the clock multipliers for SONET etc should be enough. silabs have several parts, others too. If I remember correctly, I've seen a App Note describing oscillator requirements at LTC website. - Henry Elio Corbolante

Re: [time-nuts] Calculate spectral content from a series of zerocrossing time stamps?

2011-02-07 Thread ehydra
SpectrumLab uses the Goertzel-Algorithm to trim the time reference to the millisecond range. Maybe that is comparable and as algoritm transverable? - Henry J. L. Trantham schrieb: DFT? Direct Fourier Transform? Thanks, Joe -Original Message- From: time-nuts-boun...@febo.com

Re: [time-nuts] Calculate spectral content from a series of zero crossing time stamps?

2011-02-09 Thread ehydra
LeCroy has a paper with a short explanation that I found useful: http://www.lecroy.com/files/WhitePapers/WP_TechBrief_Var_of_Time.pdf This look to me very similar to this: http://pstca.com/sampler/index.htm - Henry -- ehydra.dyndns.info ___

[time-nuts] Random Walk Noise experiment

2011-02-12 Thread ehydra
Hi all! I friend of mine wants to construct an experiment for students for studying random walk noise. What is the best good available transistor or other parts? All parts he tested where just to good. Thank you! - Henry -- ehydra.dyndns.info

Re: [time-nuts] Random Walk Noise experiment

2011-02-12 Thread ehydra
I think the confusion is now perfect: http://www.mikrocontroller.net/topic/207061#2059725 Let Google translate it from german to your language. Does the difference come from voltage vs. power spectrum? Magnus Danielson schrieb: On 12/02/11 21:02, Bruce Griffiths wrote: Flicker noise is not

Re: [time-nuts] power spectrum of hard limiter output

2011-02-14 Thread ehydra
shaper for pulses in an if-strip. I tested different ideas with schottky-diodes somewhere in the if-strip. In the end, I must say that leaving such out of the design is simply the best. Any comments? - Henry ehydra schrieb: Hi Magnus - Well. I made homework for sure. Endless viewed

Re: [time-nuts] VCXO help

2011-02-25 Thread ehydra
A circuit design? Look for 96MHz variants. Many out there. Example: http://www.qsl.net/dk1ag/96mhz_e.pdf - Henry -- ehydra.dyndns.info ewkeh...@aol.com schrieb: As part of the D/M project the counter uses a 100 MHz VCO with an AD 4001 PLL. To simplify further I would like to consider a

Re: [time-nuts] VCXO help

2011-02-25 Thread ehydra
Hm. Concerning the CS2x00. Is there a PC software available to program it via i2c? I mean without this IDT monster software. Any hint is welcome! - Henry ewkeh...@aol.com schrieb: Thanks for the info Fred The problem is the package. Looking at the Cirrus Logic CS 2300-CP and use a

Re: [time-nuts] PN sequence generation using GPS

2011-02-26 Thread ehydra
Spread-spectrum and similar schmes were a little kind of secret and secure communication around 1970 where the mathematics where done in the years before, beginning with the classic Shannon paper about information theory. Many papers were classified to help protect the knowledge their.

Re: [time-nuts] Low noise power supply

2011-03-08 Thread ehydra
Here: http://www2.electronicproducts.com/Designing_an_ultra_low_noise_supply_for_analog_circuits-article-fapo_TI_mar2011-html.aspx - Henry -- ehydra.dyndns.info ewkeh...@aol.com schrieb: There is an interesting article in the March 2011 Electronic Products magazine design an ultra low noise

Re: [time-nuts] Low noise power supply

2011-03-09 Thread ehydra
If one can say that the actual noise-floor signal is approx. white noise than the peak to average is a factor of 6 to 7 on a analog scope. I once read this somewhere and found it not a so bad decision. - Henry -- ehydra.dyndns.info David C. Partridge schrieb: H I wasn't impressed.

Re: [time-nuts] Low noise power supply

2011-03-09 Thread ehydra
For me, this looks like a advertisement campaign only. Not very sophisticated or ingenious. Read that you don't need LC-filters at the output because of the LDOs. *lol* If the designer ever heard of corner frequency?? And the ISL9000A is the same. - Henry -- ehydra.dyndns.info David C.

Re: [time-nuts] Low noise power supply

2011-03-09 Thread ehydra
Hi John and group - For us germans, american magazines always look overloaded with advertisments. The marketenders don't like to hear that the generations under 40-50 are mostly advertisment blind just by natural adaption. The times where I read paper electronics are long gone. The Internet

Re: [time-nuts] difference between Oncore M12 and M12+T (useful when buying online)

2011-03-09 Thread ehydra
This is an alternative: 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. - Henry -- ehydra.dyndns.info Rick Hambly (W2GPS) schrieb: Every now and then I see e-mails like these. I would like to remind

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

2011-03-10 Thread ehydra
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] 50/60 Hz clocks

2011-03-10 Thread ehydra
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] Plot phase noise spectrum from DMTD measurement?

2011-03-12 Thread ehydra
John Miles schrieb: Sound cards will usually end up running within 1 Hz of the desired sampling rate, but it's important to pick a sampling rate that's native to the hardware, or the driver will resample the data. On Windows, many drivers for popular sound cards rely on some imprecise

Re: [time-nuts] Datum Handbook of Time Code Formats

2011-03-12 Thread ehydra
Try this direct link:

Re: [time-nuts] Datum Handbook of Time Code Formats

2011-03-12 Thread ehydra
Yes Graham. But we are intelligent, or? Use a torrent. Or a friendly hoster like bplaced.net - Henry -- ehydra.dyndns.info gandal...@aol.com schrieb: I'm sorry to hear you continued to have problems and do not know quite where you ended up. As others have pointed out, Rapidshare,

Re: [time-nuts] Datum Handbook of Time Code Formats

2011-03-12 Thread ehydra
All IE6 users pay YOU with time for nothing. Thanks! - Henry -- ehydra.dyndns.info gandal...@aol.com schrieb: In a message dated 12/03/2011 15:23:39 GMT Standard Time, ehy...@arcor.de writes: Yes Graham. But we are intelligent, or? Use a torrent. Or a friendly hoster like

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

2011-03-12 Thread ehydra
At the moment I design a Ethernet UDP-capable sound-card as a secondary priority project in free-time. I settled to the AD7641 but welcome any suggestions/additions if one is interested. The main app would be SpectrumLab. cheers - Henry -- ehydra.dyndns.info Tijd Dingen schrieb: For that

Re: [time-nuts] Datum Handbook of Time Code Formats

2011-03-12 Thread ehydra
or djvu: http://any2djvu.djvuzone.org/djvu/110312/84.181.76.205/19469.110312152109.djvu - Henry -- ehydra.dyndns.info Rob Kimberley schrieb: I've also just downloaded the slow version in 2.5 minutes. Seems damn quick to me. This was with Firefox, which I prefer above all other browsers.

Re: [time-nuts] SI Unit Problems

2011-04-05 Thread ehydra
For me it looks like this guy hates SI system. There are many out there. How cares? The problems arise if systems get mixed up and at least one end of the communication link thinks the other does the same. So left-right screws confusing between UK and Europe, satellites with inch-meters

Re: [time-nuts] SI Unit Problems

2011-04-05 Thread ehydra
I don't think that SI is the last system we see and that is for the decimal system too. I see small problems like the definiton of mass as units of 1000xgrams and that the k is low but should be K to be consistent (M, G, etc). But to think the american system is better must be a joke. Even the

Re: [time-nuts] SI Unit Problems

2011-04-06 Thread ehydra
It makes senses even for this list! Numbers like 12 and 60 are chosen for their high number of dividers. That is a mathematical reason. Think of in ancient time all was divided in equal integers units. Even the Maya knew it! This is connected to numbers of low n-divide with the ultimate of

Re: [time-nuts] cheap 5V OCXO in 14DIP has about 1E-9 drift per day

2011-04-17 Thread ehydra
I prophet: Chris Albertson schrieb: I asked the question because I might want to build one of there but I could not see how they could be table with just an RC filter. So the answer is they just are. Mixing generates two frequencies and a DC phase shift response. If RC filtered you get the

Re: [time-nuts] IEEE Spectrum Magazine interviews one of our own...

2011-05-26 Thread ehydra
That is the solution: http://xkcd.com/162/ - Henry -- ehydra.dyndns.info Tom Van Baak schrieb: Hi Christopher, Thanks for those interesting links. Note PHK's original ACM article is: http://queue.acm.org/detail.cfm?id=1967009 The recent IEEE mention is:

Re: [time-nuts] GPS interference and history...

2011-06-10 Thread ehydra
Jim Lux schrieb: The MEO height of GPS was a deliberate choice (again, that GPSWorld series is a fascinating history of how it came about). Don't forget that one of the original reasons for GPS was for doing midcourse correction on ICBMs. Where is this GPSWorld history located? regard -

Re: [time-nuts] GPS interference and history...

2011-06-10 Thread ehydra
Thanks Jim! Sorry for posting on time-nuts list with time-offset +1 ;-) corrected. - Henry -- ehydra.dyndns.info Jim Lux schrieb: On 6/10/11 6:55 AM, ehydra wrote: Jim Lux schrieb: The MEO height of GPS was a deliberate choice (again, that GPSWorld series is a fascinating history of how

Re: [time-nuts] Advanced 5 to 10 MHz doubler

2011-06-14 Thread ehydra
Almost lost... OK. In the meantime I worked on a project where I needed a doubled frequency of a signal with gaps. I made a synchronous oscillator locking on the double frequency. Works great and is as simple as thing can go. It works by injection locking. Such a circuits shows a PLL

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