Re: [time-nuts] 4046 replacement

but as I wrote a while ego ADI has a bit different chip which is free of dead zone and much faster, I used it for low phase-noise clock generator for 3,1Gb/s fiber optic systems of C-Cor/Comlux in the end of the past century, now I am on vacation and do not have my engineering note books with

Re: [time-nuts] WWVB: measuring local 60 KHz noise

tuned,[ fine-tuning with vari-caps remotely] large size frame antenna 1 meter dia provides mV size 60kHz in the Livermore area in California from the Colorado WWVB TX 73 KJ6UHN Alex On 5/5/2018 6:17 AM, Ulrich Rohde via time-nuts wrote: I am trying to use the 60 KHz for synchronization of a

Re: [time-nuts] Weird Stuff Warehouse shutting down

other surplus:

[time-nuts] Fwd: quartz / liquid nitrogen

at low temperatures bipolar devices will have reduced gain 73 KJ6UHN Alex Forwarded Message Subject:[time-nuts] quartz / liquid nitrogen Date: Mon, 2 Apr 2018 12:46:26 -0700 From: Tom Van Baak Reply-To: Tom Van Baak ,

Re: [time-nuts] HP 117A for ship

Hi Perrier, do you have the antenna for it too? 73 KJ6UHN Alex On 2/27/2018 6:39 PM, Perry Sandeen via time-nuts wrote: List, I have a 117 receiver that I never got round-to-it. The tag on the unit sayes one tube is weak.  I have at least one extra tube (6CW4 IIRC) and more likely two.

Re: [time-nuts] Heathkit GC 1000 Most Accurate Question

Hi Bill, where are you located? since something like that, would be a perfect "therapy" for me, because I am always buying "all kind of junk" [my wife's opinion, but it is very close to the reality ] and after I fixed it and played with played with them don't know what to do with it...and it

Re: [time-nuts] Bye-Bye Crystals

actually the process started as Statek started to etch the crystals http://www.statek.com/corporateoverview.php in 1970, and produces high quality crystal since than. 73 Alex KJ6UHN On 3/13/2017 11:05 AM, Richard Solomon wrote: I don't think it's as much the manufacturing process as it is

Re: [time-nuts] Vintage Frequency Measurement

worked to was made with solid-state components 73 KJ6UHN Alex [Dr. Alexander Pummer a former design engineer of Schomandl KG in Munich Bavaria/Germany] On 2/12/2017 6:07 AM, Bob Camp wrote: Hi Counters go back at least into the early 1950’s. I started out with fully vacuum tube (except

Re: [time-nuts] low power, but quiet, oscillators

hi Magnus, how about the effect of that cheap 2,7K on the active device if it is bipolar? Greetings Alex On 2/6/2017 4:35 PM, Magnus Danielson wrote: Hi, On 02/07/2017 12:36 AM, jimlux wrote: On 2/6/17 2:37 PM, Bob Camp wrote: Hi One of the most basic reasons for putting out > +20 dbm is

Re: [time-nuts] FE-5650A option 58 tuning word for 10 MHz output

and if you glue a piece of non-magnetic material -- which could hold that connector -- it could be even some plastic, to the surface of the mu-metal , you do not need to worry about disturbing the magnetic conditions 73 KJ6UHN Alex On 1/2/2017 3:44 PM, Attila Kinali wrote: On Tue, 03 Jan

Re: [time-nuts] Totally unrelated, but..

Once upon the time, there were some "three legged" voltage regulators, which were very sensitive to the ESR value of the capacitor which was connected to their output. With to low ESR values they oscillated, [the oscillation was "inside" of the regulator, which became warm, or sometimes hot,

Re: [time-nuts] Rohde & Schwarz XSD 2.5 MHz crystal gone bad?

"that should cause lowering the frequency" and it will lower the Q of the crystal too, therefore it will need more drive! 73 KJ6UHN Alex On 11/20/2016 5:00 PM, Alan Melia wrote: Michael a couple of wild thoughts, make sure there is no 500kHz there (this is the crystal fundamental and the

Re: [time-nuts] I love the smell of tantalum in the morning

metcal has a "hot twizer " to remove SMD components it heats the component on both end 73 Alex On 11/5/2016 12:55 PM, Hal Murray wrote: t...@leapsecond.com said: Having not done SMT before, how should I do it with minimal risk to the very precious PCB. Or, what equipment should I use this

Re: [time-nuts] Prologix USB-GPIB Controller

Once upon the time I designed some power-supplies, used parts from a sound name US company, they asked for $12.-- each --it was long time ego -- the equipment supposed to built in Asia, the manager -- I was one outside consultant -- told me that we can not use that expensive parts, my Chinese

Re: [time-nuts] TimeLab

Hello Magnus, I am a totally unerducated time nut better, to say; not time nut, just an old RF ingenieur, and so I have trouble to understand how could a counter stop to count before it started to count. I case you would have a circuit, which would tell you which pulse came at first and

Re: [time-nuts] time-nuts Digest, Vol 146, Issue 35

Sometimes rectifiers generating very high harmonics particularly if the rectifier is used close to it's current limits. The reverse recovery time increases, therefore the current is conducted after the polarity change for a very short time --until the now majority charge carriers sweeping

Re: [time-nuts] HP-105B Battery Replacement?

if you deep discharge led acid batteries -- which are not made special for deep discharge -- you will have to replace them quite often, on the other hand Ni-Fe batteries you could short out, overcharge they are undisrtuktable that is the reason why they are not produced any more in the US,

Re: [time-nuts] HP-105B Battery Replacement?

Hi Brooke, sorry I have to disappoint you; Ni-Cd batteries do not use any acid, they have K-OH kalium hidrioxid [potassium hydroxide for anglophone ] as electrolyte and they are normally very air-tide, and widely used in radios. 73 KJ6UHN Alex On 9/14/2016 4:45 PM, Brooke Clarke

Re: [time-nuts] Anybody want a Thunderbolt power supply?

there are peoples and societies for whom the most important parameter is the price of the goods, and there are also some societies for them the most important is the proffit 73 Alex On 8/31/2016 3:13 PM, Bob Stewart wrote: Charles, said: "So the answer is to bring crap to market because

Re: [time-nuts] SR620 Problem

how fare are you familiar with electronic equipment troubleshooting? could you find components, test points if somebody would ask you for that? do you have some electronic test equipment e.g. multimeter, oscilloscope? --last year I helped somebody to fix one HP high-frequency generator just

Re: [time-nuts] SR620 Problem

Hi Tom, do you have circuit diagram for the unit? 73 Alex On 8/29/2016 2:37 PM, Tom Miller wrote: You might say where you are. Maybe someone lives close that can assist you. Regards, Tom - Original Message - From: "Don@True-Cal" To: "'Time Nuts

Re: [time-nuts] DIY VNA design, directional coupler

there is a current mode feedback device [which does not follows the gain bandwidth product role ] and has 1000V/usec rise time 92dB THD at 30MHz 3nV/rtHz noise, see here http://www.ti.com/lit/ds/symlink/ths4271.pdf, I used it as a medical color Doppler application Guanella's choke and

Re: [time-nuts] Heathkit clock available

before you buy AC line disciplined clock read that It hertz when you do that – power grid to stop regulating 60 Hz frequency https://wattsupwiththat.com/2011/06/25/it-hertz-when-you-do-that-power-grid-to-stop-regulating-60-hz-frequency/ 73 KJ6UHN Alex On 8/8/2016 2:29 PM, Nick Sayer via

Re: [time-nuts] Looking to find an antenna for a TrueTime XL-DC

Meinberg https://www.meinbergglobal.com/ makes complete down and up converter for GPS remote antennas 73 KJ6UHN Alex On 8/5/2016 3:11 PM, Rick Jones wrote: On 08/04/2016 06:02 PM, Hal Murray wrote: rick.jon...@hpe.com said: HalM was kind enough to come over the other day with some antennae

Re: [time-nuts] GPS antenna selection — lightning

lightening protection: http://www.ul.com/wp-content/uploads/2014/04/LightningProtectionAG.pdf 73 KJ6UHN Alex On 8/5/2016 1:51 PM, Attila Kinali wrote: Hi Eric, On Fri, 5 Aug 2016 10:37:28 -0400 Eric Scace wrote: A GPS antenna and its coax line that is installed next to a

Re: [time-nuts] The home time-lab

you could bring the horse to the well. On 7/24/2016 7:36 PM, Bill Hawkins wrote: Years ago I knew exactly how Sola regulators worked. That has faded, but what remains is that the regulation was done by varying the saturation of the core. That's why there is a slot in the laminations. I

Re: [time-nuts] HP5370 power supply measurements

PABST KG in the Black Forest (Germany) made very quite high efficient fans, HP used to use these fans for awhile, but the company was sold and the quite fans disappeared, the new fans from the new owner http://www.ebmpapst.us/en/ are cheaper but not so good 73 KJ6UHN Alex On 7/15/2016

Re: [time-nuts] The home time-lab

if yo limit the Q you limit the effect also... by the way the Q is already limited by the ohmic resistance of your transformer coils. 73 KJ6UHN Alex On 7/8/2016 10:08 PM, David wrote: And I will add a high voltage power resistor to limit the Q. On Fri, 8 Jul 2016 22:12:53 -0400, you wrote:

Re: [time-nuts] How can I generate a very clean 1 W signal @ 116 MHz ?

KVG Neckarbischofshofen used to have a crystal in a glass envelope, which was made just for that purpose it was third overtone crystal ask Bernd if that is still available, of course you would need a low noise power amplifier to get that 1W 73 KJ6UHN Alex On 5/30/2016 4:06 AM, Dr. David

Re: [time-nuts] Rpair of an 8662 HP Generator

the service manual is available here: http://elektrotanya.com/hp_8662a_sm.pdf/download.html, special parts are here: http://www.sphere.bc.ca/test/hpparts.html possible repair: http://www.naptech.com/ 73 KJ6UHN Alex On 4/15/2016 6:25 PM, KA2WEU--- via time-nuts wrote: Thanks, I do not have a

Re: [time-nuts] Fast risetime pulse generator

Hi Bill check out the classical fast rise time pulse generator the mercury whetted relay, with a good lay-out you could get easily 50psec rise time, but rather use an SMA than BNC. You could look for an old Tektronix pulse generator used that principle 73 KJ6UHN Alex On 4/12/2016 1:30 PM,

Re: [time-nuts] Building a mains frequency monitor

just look what is happening in one amplifier which happened to be a bit to slow for for the passing trough signal. The part of the spectrum -- which can't make it -- although will not show up at the output, will not disappear, but --if the amplitude is large enough -- overdrive parts of the

Re: [time-nuts] Advise on building a DIY GPSDO?

and it is relative easy to make 10MHz from 8MHz with analog frequency manipulation, which generates less jitter 73 On 4/4/2016 4:27 PM, Attila Kinali wrote: On Mon, 4 Apr 2016 17:56:29 -0400 Bob Camp wrote: The variable frequency output on the uBlox (and other) GPS receivers

Re: [time-nuts] Advise on building a DIY GPSDO?

Building it cost you time and money, most likely much more than to buy, but you gain experience and you learn the limits of the different techniques, what you would not get to know other way 73 KJ6UHN Alex On 4/4/2016 1:15 PM, Dimitri.p wrote: Regarding "as good a place to start as any",

Re: [time-nuts] Phase noise test set reference articles

Hello Gerhard look that: http://cp.literature.agilent.com/litweb/pdf/5989-8999EN.pdf http://rfic.eecs.berkeley.edu/~niknejad/ee242/pdf/ee242_mixer_noise_design.pdf and also STEPHEN MAAS has very good book on mixers... Microwaves101 | Mixers www.microwaves101.com/encyclopedias/mixers Mixers.

Re: [time-nuts] Phase noise test set reference articles

and here is with very good literature: https://www.google.com/search?q=Haas+Mixer+noise=utf-8=utf-8#q=Maas+Mixer+noise On 3/29/2016 3:28 PM, Gerhard Hoffmann wrote: Am 29.03.2016 um 16:53 schrieb Charles Steinmetz: (10) Phase_detector_with_low_flicker_noise_BARNES_etal_NIST_2011: Describes

Re: [time-nuts] Prescaler

there is a very inexpensive one ADF4118 works up to 3GHz which has a programmable prescaler http://www.analog.com/media/en/technical-documentation/data-sheets/ADF4116_4117_4118.pdf more here: http://www.qsl.net/bg1ceo/Tech_topic/rf/7G_prescaler/prescaler.html or here:

Re: [time-nuts] Spectrum Analyzer Specifications --> phase noise test set

Use TNC, which is free of the problem and it fits into the same hole... 73 KJ6UHN Alex On 3/25/2016 3:46 PM, Bob Camp wrote: Hi The sensitivity of BNC connectors goes up quite a bit as they wear out. Both sides of the connection are subject to wear. Replacing both sides is often the only

Re: [time-nuts] HP5370B & HP5345B Front-End IC Redesign Effort

there are amplifiers with multiple GHz gain bandwidth product, [http://electronicdesign.com/analog/18-27-ghz-chip-set-operates-little-18-v] also the high speed ECL line receivers have available gain [http://www.ti.com/lit/ds/symlink/sn65lvds4.pdf] 73 KJ6UHN Alex On 1/27/2016 2:22 PM, Bruce

Re: [time-nuts] DMTD - analog multiplier vs. diode mixer ?

and there was also a frequency/phase detector from Analog Devices, which took care about that dead zone 73 KJ6UHN Alex On 1/10/2016 10:53 AM, Richard (Rick) Karlquist wrote: Phase frequency detectors (starting with the legendary MC4044) being made out of flip flops, had metastability and/or

Re: [time-nuts] DMTD - analog multiplier vs. diode mixer ?

esign of the digital mixer with detailed theory and example in three consecutive issue of the magazine Radiotechnika -- in Hungarian. By using that literature I designed many frequency synthesizers containing D flip-flops as a digital mixer 73 KJ6 UHN Alex [alias Dr.Dipl.Ing. Alexander Pummer,

Re: [time-nuts] PPS phase between two GPS units.

swap the two receivers and see which one is leading, if leading is changing the delay difference is with the antenna signal distribution 73 KJ6UHN Alex On 12/21/2015 8:03 PM, paul swed wrote: I think you are doing the right test to see if the splitter delay is the issue 21 ns is mighty small

Re: [time-nuts] Mechanical clock sound pickup circuit

Once upon the time there was a "Vibrograph", see nice pictures here: https://www.google.com/search?q=vibrograph=isch=u=univ=X=0ahUKEwigtcmSn9fJAhUW8GMKHVNyAMcQsAQIHA=1760=888 ,which picked up the sound of watches, clocks, and the watch maker was able to set the watch very accurately, these

Re: [time-nuts] GPSDO and oscillator steering - EFC vs DDS schemes?

Bar Giora Goldberg wrote a book on DDS Digital Frequency Synthesis Demystified see here: http://www.amazon.com/Frequency-Synthesis-Demystified-Bar-Giora-Goldberg/dp/1878707477 [· In-depth coverage of

Re: [time-nuts] GPS down converter question

actually the 34MHz filter [Meinberg scheme ]could be made at home, by using old 10,7MHz FM-IF filters magnetic material, once upon the time I made some 27MHz filters that way, for 70MHz is bit risky, since there is no salvageable out there, perhaps by using some "binocular" cores made for

Re: [time-nuts] Low noise quartz crystal oscillator by Bruce Griffiths

Hi Rick, any info on how Wenzel makes that low noise oscillators? 73 KJ6UHN Alex On 10/28/2015 3:04 PM, Richard (Rick) Karlquist wrote: Do you have a specific URL for "hacking oscillators"? I can't find it on Rubiola's web site. Rick On 10/28/2015 1:32 PM, Gerhard Hoffmann wrote: Am

Re: [time-nuts] Digital Phasae Lock Loops

Hi Steve, I will tell you a big secret; a digital PLL is not a low phase noise system and a very good introduction to PLLs and the digital PLL could be found in Roland Bests: Phase Locked Loops 6/e: Design, Simulation, and Applications 73 KJ6UHN Alex On 10/16/2015 7:45 AM, Martyn Smith

Re: [time-nuts] Digital Phasae Lock Loops

didn't know it was up to a sixth edition. On 10/16/2015 11:18 AM, Alexander Pummer wrote: Hi Steve, I will tell you a big secret; a digital PLL is not a low phase noise system and a very good introduction to PLLs and the digital PLL could be found in Roland Bests: Phase Locked Loops 6/e

Re: [time-nuts] Digital Phasae Lock Loops

15 4:33 PM, Alexander Pummer wrote: actually my old friend Dr. Floyd Gardner -- who is the pope of the phase locked loops -- told me some thirty years ego , that the Best book os a very good introduction 73 Alex On 10/16/2015 1:42 PM, Dave Daniel wrote: Roland Best's text is the best (no pun inten

Re: [time-nuts] wtd: WWVB info

it looks like somebody already made a decoder for a wwvb like transmission, see here: Performance Analysis and Receiver Architectures of DCF77 Radio-Controlled Clocks * Daniel Engeler Daniel Engeler researcher/75928367_Daniel_Engeler Zuhlke Engineering AG, Schlieren,

Re: [time-nuts] wtd: WWVB info...

a software demodulator for the DCF77 was published last year, the DCF77 has similar modulation structure as the new wwvb it was developed at a Swiss company 73 KJ6UHN Alex On 8/6/2015 3:11 PM, Donald wrote: I have found this old posting from 2014:

Re: [time-nuts] 60Hz line data

but for a very long time we get --or better to say got in the past -- the correct number of periods of the line frequency, I have two clocks side by side -- one driven by the power line the other is an atomic clock from Westclox guided by WWVB and the seldom disagree about the time 73

Re: [time-nuts] HP10811 dual oven

Hi Dan, I would be interested on that document too Thank you in advance 73 KJ6UHN Alex On 8/3/2015 12:40 PM, Dan Kemppainen wrote: Hi, If you search the internet, you should come across a design by Warren S. It's basically the same type of oven controller that is used in the internal oven

Re: [time-nuts] Square to sine wave symmetrical conversion (part 2)

it is relative easy to make a perfect 50% square wave from almost any input wave form U1 could be any-- fast enough for the desired frequency--comparator or a transistor pair similar to Charles Wenzel's circuit, R1 C1 is a long time integrator,[ RxC 1/f of the incoming frequency] the

Re: [time-nuts] LORAN on the air 89700 been a good day so far

Hi Bill, it is very dependent which is closer to the receiver here in the Bay Area sometimes you can't hear local AM stations either. 73 Alex KJ6UHN On 7/21/2015 3:15 PM, billriches wrote: Hi Alex, 100 Khz is not protected however the interference from SMPS is annoying but will not bother

Re: [time-nuts] Electronically Disciplined Mechanical

Hi Bert at the Neu Tecknicumbuchs, /Buchs/, Switzerland somebody made a diplom work a quite-few years ego very similar clock, the pendulum was synchronized to the 75kHz accurate time transmitter, you may could find out more about it at the Neu Tecknicumbuchs, /Buchs/, Switzerland 73 KJ6UHN

Re: [time-nuts] lawnmower robots may be the end of VLF timekeeping

Bob Widlar -- yes the designer of the 741 -- of National Semiconductor had a better idea, he bought a few sheep 73 KJ6UHN Alex On 5/9/2015 2:02 PM, Mark Sims wrote: iRobot (the Roomba vacuum cleaner people) have applied for an exemption to allow them to send beacon signals in a 6-7 GHz band

Re: [time-nuts] Tektronix Sample Heads

and be very careful, it does not tolerate more than ±2 volts input! it was originally designed for the CSA 803A and requires a relative complicated control system, it has a 15 to 18 picoseconds rise time, 50 ohms input, and at least 30dB return loss at 18GHz. If both inputs are used they

Re: [time-nuts] 510 doubler

And the narrow notch for the harmonic is not required anyway, since the fundamental is fare enough, therefore a high Q LC trap will work better, also with the setting of the biasing af the active devices the spures could be reduced to [ just observe the output with a spectrum analyzer and set

Re: [time-nuts] tutorial on phase noise and PLLs?

Hi Jim look here: http://www.gigatronics.com/uploads/document/AN-GT140A-Introduction-to-Phase-Noise-in-Signal-Generators.pdf 1981, /Dieter Scherer/, Generation of Low /Phase Noise/ Microwave Signals ... 1978, /Dieter Scherer/, Design Principles and Test Methods for Low /Phase Noise/ ...

Re: [time-nuts] Practical considerations making a lab standard with an LTE lite

Schomandl -- the company which made the first indirect synthesizers in the sixties in the past century -- used buried crystal oscillators as standard frequency source, 12meter deep in the companies yard in the Belfort Strasse in Munich, Bavaria Germany, ...Rohde Schwarz also had buried

Re: [time-nuts] WWVB format

Hi Paul, the phase modulation would interfere with the AM, since during the phase change the narrow band crystal filter's output will sink down as the filter is following the phase change, and the time needed for the filter to swing in to the new phase it depend on the angle of the phase

Re: [time-nuts] Mercury Ion Clock

what power is need at 40GHz? 73 Alex On 11/2/2014 4:44 PM, Magnus Danielson wrote: Dave, On 11/03/2014 01:29 AM, Dr. David Kirkby (Kirkby Microwave Ltd) wrote: On 1 Nov 2014 16:50, Jim Lux jim...@earthlink.net wrote: behind a scintillator) The 40 GHz stuff these days is not nearly as

Re: [time-nuts] Really fast ADC needed

pipeline converter, but it needs as many clock period as the required bits, does he has the fast logic to deal with that amount of data? 73 KJ6UHN Alex On 10/29/2014 9:46 PM, Mark Sims wrote: A friend of mine is looking for an ADC that can do 5 bits at 20-40 gigasamples/second... there is a

Re: [time-nuts] 10MHz Rubidium reference source for frequency counter

Don't give up Karen, the Morion oxcos are relative easy to repair, you need one coca-cola can, cut it is pieces until you get a very thin ALU foil, get some thicker carton wind around the box of the OXCO's box that way you have a heat isolation between the OXCO's box and the vise, which you

Re: [time-nuts] Cheap Frequency chip with serial output

Hi Paul, do you know about TDRs? I have a CSA803A with SD24 dual TDR head, which I did not used for at least five years, now I needed it and found, that in high resolution --below10psec --it became very noisy, [both channels] any idea? the box is cca 15 years old , power-supply? 73 Alex On

Re: [time-nuts] Some specs for MTI Millren 260 OXCOs

Hi Pete, even a member of IEEE has to purchase it: but don't give up yet 73 KJ6UHN Alex On 10/23/2014 2:04 PM, Pete Lancashire wrote: Anyone have a IEEE account ?

Re: [time-nuts] Some specs for MTI Millren 260 OXCOs

On 10/22/2014 1:57 PM, Scott Newell wrote: At 03:43 PM 10/22/2014, Dave M wrote: Content-Transfer-Encoding: 7bit I contacted one of the MTI Milliren marketing guys a few days ago, and got some specs on the MTI model 260-0624C and 260-0544C OXCOs that are currently Be careful. I bought a

Re: [time-nuts] What sort of oscillator is this?

that is most likelly a TXCO, what is in the user's manual about warm up time? if they have a special precise reference -- like for spectrum analyzer or frequency counter that would have at least one magnitude better stability and would have OXCO,a good OXCO like the Milliren 260 series or the

Re: [time-nuts] Homemade GPS Receiver

it is relative complicated, since you need to look multiple satellites almost in the same time 73 Alex On 9/26/2014 5:12 PM, Hal Murray wrote: he...@pericynthion.org said: Since the GPS signals come from all parts of the sky this is pretty much required, unless you're using fancy beam

Re: [time-nuts] WWVB d-psk-r down conversion method...

there is an interesting side effect with that phase modulation: in case the crystal filter is narrow enough --to use for the old AM format-- the phase change creates an additional AM modulation, if you take in consideration that effect by the decoding the modulation, you could recover the time

Re: [time-nuts] WWVB d-psk-r down conversion method...

it could be that the intention was good , but there is no reliable atomic clock and the company which promised the chip still no t delivered any usable, as I learned from two of my clients which are in the were business of making atomic clocks 73 Alex On 9/23/2014 11:06 AM, Charles

Re: [time-nuts] WWVB d-psk-r down conversion method...

Hi Brooke, I hope that you are right with that chip, and despite the name change of the company -- now Xtendwave -- and recovering they will deliver something some times. I can see that with correlation and averaging schemes the signal to noise ratio of data, perhaps constant frequency

Re: [time-nuts] Correcting jitter on the 1 PPS signalfrom a GPS receiver.

depend how do you terminate the, cable if the cable's impedance is Z, use two terminating resistors each R =2Z, one is connected to thee ground the other is connected to the supply voltage of the receiving chip, that way although the cables input and output termination will eat up half of the

Re: [time-nuts] Is a crystal likely to change frequency by 3% ?

the battery voltage change and the driver pulses of the magnet -- the recorder was not able to follow the individual pulses, but the envelope 73 Alex On 9/13/2014 5:08 AM, Dr. David Kirkby (Kirkby Microwave Ltd) wrote: On 13 Sep 2014 01:23, Alexander Pummer alex...@ieee.org wrote: just open

Re: [time-nuts] Is a crystal likely to change frequency by 3% ?

just open the box, look for the wires which going to the magnet which drives the minute hand and measure the period time -- not the frequency, it is to low yes analog quarz clock slows down as the battery get old, you will be surprised, that the driver pulse's period time dos not change, but

Re: [time-nuts] Eureka, no more Cs, active or passive H-masers or GPSDOs needed

and if you look the claims of the patent, they are very close to the Shera design, which was a bit earlier idea 73 KJ6UHN Alex On 9/10/2014 10:12 AM, iov...@inwind.it wrote: On Tue, Sep 9, 2014 at 4:26 AM, Azelio Boriani azelio.bori...@screen.it wrote: Take a look at this patent

Re: [time-nuts] Oscilloquartz 3210 Cesium Standard

yes I got these executable too, and therefore did not continued 73 Alex On 9/9/2014 5:59 AM, paul swed wrote: Ohhh that hurts and you were lucky. I always mark connectors for that exact reason. I was going to download the pictures but it kept trying to download some executable. So will not be

Re: [time-nuts] Need help with transformer core

forward converter [not fly -back] look for pot-cores material 3C80, 3C81, 3C85 or equivalent, you will need a cca 21 to 28mm dia pot-core if you run it at 80 to 120kHz, driver ic TL495 , which is a PWM push pull controller estimate the efficiency for 60% for the input power, look for very good

Re: [time-nuts] time-nuts Digest, Vol 121, Issue 65

actually if the oscillator is stabil enough, with a very long time constant one could kill the phase modulation of the new WWVB format 73 Alex On 8/23/2014 6:27 PM, Bob Camp wrote: Hi If you lock an Rb to GPS, you need / want / should do it with a *very* long time constant. Numbers in

Re: [time-nuts] Cutler NAA on 24.0kHz....

if you use analog way to divide the 120kHz that will prevent an incidentally flip of the phase 73 Alex On 8/17/2014 2:21 PM, paul swed wrote: Robert Yes indeed the lm3900 is a great part. The last opamp is a 100hz BPF. The RCs perform a phase shift and I will tend to believe that at the

Re: [time-nuts] WWVB for Time Nuts

Actually, why was the WWVB modulation format changed, before a functioning new transmission system was at least demonstrated? Since the new --supposed to be superior --system exist on paper, if at all only, but not available to replace a more or less usable usable one. 73 Alex On 8/10/2014

Re: [time-nuts] WWVB BPSK patent status

look that also: 48 Ultra-accurate DSP-based DCF77 Timecode Receiver To extract the highest possible accuracy from the German DCF 77.5 kHz time - code broadcast this project uses DSP algorithms running on a low-cost dsPIC33 microcontroller to filter and demodulate both the AM and phase modulated

Re: [time-nuts] WWVB BPSK patent status

also there is one FPGA based system already available unfortunately the description is in German : http://www.cadt.de/dieter/dcf/Praezisionsfrequenzmessungen.pdf On 8/8/2014 5:33 PM, Alex Pummer wrote: there was a Swiss ingenieur who designed and published a receiver design for the DCF77

Re: [time-nuts] Low noise powersupplies

to measure a power supply noise, better to say the noise spectrum, you would need a very large non polarized capacitor and spectrum analyzer, The input of the spectrum analyzer does not like DC, and has low impedance. Since spectrum analyzer's input impedance is usually 50 ohm, for to be able

Re: [time-nuts] Low noise powersupplies

like a spectrum analyzer which was made to analyze spectrum and the sound card self is in a relative noisy environment in the PC On 8/7/2014 3:09 PM, Bob Stewart wrote: What about a PC sound card? From: Alexander Pummer alex...@ieee.org To: Discussion

Re: [time-nuts] Tektronix TM500 extender cable kit

that is one empty e-mail Robert LaJeunesse did not write anything into it 73 Alex KJ6UHN On 8/6/2014 5:17 PM, Robert LaJeunesse wrote: ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] Effects of noise on EFC line?

and use not to large capacity, because above the serial resonance frequency [trace inductance, own inductance] it will be inductive! 73 Alex KJ6UHN On 8/5/2014 12:16 PM, Jim Harman wrote: I was able to quiet things down a lot by putting a 100 ohm resistor in series with the 74HC output. If

Re: [time-nuts] OT Gel Cell question

as long as it is not a gals/ceramic seal, there is no way to stop sulfuric acid to get out from the cell, just imagine the dilatation diffrence between plastic and metal... 73 Alex On 7/28/2014 10:12 AM, Ed Palmer wrote: As I understand it, the only time that any sealed lead acid battery will

Re: [time-nuts] Synergy-GPS SSR-6tru Problem Resolved

Synergy's owner Ulrich Rohde N1UL --DJ2LR/DL1R is a long time ham radio operator, and he will go pretty far to help for an other ham, 73 KJ6UHN ex DL... Alex On 7/25/2014 5:27 PM, Bob Stewart wrote: And while this subject is still up, I want to let the group know that Synergy *really* went

Re: [time-nuts] Synergy-GPS SSR-6tru Problem Resolved

On Fri, Jul 25, 2014 at 8:51 PM, Alexander Pummer alex...@ieee.org wrote: Synergy's owner Ulrich Rohde N1UL --DJ2LR/DL1R is a long time ham radio operator, and he will go pretty far to help for an other ham, 73 KJ6UHN ex DL... Alex On 7/25/2014 5:27 PM, Bob Stewart wrote: And while this subject

Re: [time-nuts] GPS III

I received a little package with a GPS receiver + antenna from Gentleman [H6m] and I would like to tel him thank you very much 73 KJ6UHN Alex On 7/24/2014 5:57 PM, Bob Camp wrote: Hi If you go looking for them on the auction sites, the RYN25DI from Reyax is the search item for the RS-232

Re: [time-nuts] new clock

it does need a different design, but a buried oscillator, 5 to 8 meter deep in the garden has the best temperature stabilization, just don't turn thee power off, but that could be done using the old Greek water-clock principle, the spill over stabilizer. In the Bay Area [California] the soil's

Re: [time-nuts] temperature sensor

NTC are not that very stable, they are amorphous material winch could recrystallize slowly and therefore change it's electrical behavior , PT100 style is more reliable since it is pure metal 73 Alex On 7/21/2014 1:22 AM, Attila Kinali wrote: On Sun, 20 Jul 2014 23:18:38 -0700 Tom Van Baak

Re: [time-nuts] Noise and non-linear behaviour of ferrite transformers

No, the current passing the outside f the shield will not induce any voltage inside of the coax, but the voltage drop caused by the current on the ohmic resistance [!!!] of the shield will show upbetween the two ends of the cable -- and that will show up as it was added to to the voltage

Re: [time-nuts] quartz oscillator injection locking

if you have enough buffering -- look for now noise amplifiers, which have low h12 [= backward gain ] a quartz oscillator will not lock so easy On 7/19/2014 5:24 PM, Attila Kinali wrote: On Sat, 19 Jul 2014 16:45:14 -0400 paul swed paulsw...@gmail.com wrote: Attilla I did look at some

Re: [time-nuts] sine to square wave converter

look Charles Wenzel's waveform conversion: http://www.wenzel.com/documents/waveform.html 73 Alex On 7/10/2014 11:40 AM, br...@ko4bb.com wrote: On July 10, 2014 at 10:55 AM ewkeh...@aol.com wrote: As part of the FE 405 B project a separate output circuit is in the works. The universal

Re: [time-nuts] Interesting frequency standard project

there was an article in the January 2012issue of the elektor DCF77 locked reference, the DCF77 has very similar modulation format as the new modultion format of the WWVB 73 KJ6UHN Alex On 7/4/2014 2:21 PM, paul swed wrote: An interesting article much like one Bert sent me circa 1989 quite

Re: [time-nuts] Interesting frequency standard project

for an AM station is strait forward at first use a narrow filter to make sure that you have just one station and feed the filter out put into a limiter the output of the limiter will be the carrier. 73 KJ6UHN Alex On 7/4/2014 3:27 PM, Hal Murray wrote: paulsw...@gmail.com said: The key to

Re: [time-nuts] DIY FE-5680A lobotomy (disable temp compensation)

keep the heat sensing very close to the heating to avoid thermal control oscillation ! a thermal time constant is large and no to easy to deal with it 73 Alex On 7/3/2014 6:35 PM, Angus wrote: Hi Bert, I am thinking about testing a heat pipe on a fan cooled setup I use. The first temp

  1   2   >