Re: [time-nuts] Measuring coax temperature coefficient with a TICC

most likely the cooper is much ticker than the penetration of the lowest frequency for which the cable is used, therefore the high frequency "does not" see the steel inside of the cooper, that steel could cause problem if the coax also used to carry some power -- DC or AC -- because at lower

Re: [time-nuts] Re. DIY atomic "resonator" 6GHz synthesizer from ADI

the are 6GHc synthesizer chips from ADI available see here http://www.analog.com/en/analog-dialogue/articles/design-a-direct-6-ghz-local-oscillator.html 73 KJ6UHN Alex On 4/11/2017 8:29 AM, Attila Kinali wrote: On Tue, 11 Apr 2017 07:31:01 + Andre wrote: Has anyone

Re: [time-nuts] Re. DIY atomic "resonator"-- replacing SDRs

YES SDRs [step Recovery Diodes] is hard to find today, but there many-- PIN -- diodes, which exhibits that effect, even some standard rectifier diodes could be used for, despite of that Magnus is right, today are better solutions available e.g. PLLs with 10GHz prescalers 73 KJ6UHN Alex On

Re: [time-nuts] Sinlge ADC multi-band receiver

depend how much in-band loss could you afford it is relative easy to make cavity filters if you have a network analyzer available 73 Alex On 4/10/2017 9:11 AM, Attila Kinali wrote: On Sun, 9 Apr 2017 18:13:48 -0400 Bob kb8tq wrote: The beauty of the system would be that

Re: [time-nuts] Car Clock drift - the lowly 32kHz tuning fork crystal specs

actually it does not compensate for temperature it is just for reduce the production cost for the crystal. We --Jean Hoerni [founder of intersil, Eurosil and one of the traitors who started Fairchild Semiconductor] and me -- made something very similar at the time of begin of the quartz clock

Re: [time-nuts] HP-59309A Clock counts only seconds, HEF4011

NOt pin-compatible but functional compatible and available is the 74C00 or74 HC00, which has a long life I am using one in my gate alarm since1989, it is on all the time and the chip is available the HEF4011 is also available -- at Mouser -- it is pin-compatible and function with CD4011 ad it

Re: [time-nuts] TAPR TICC boxed

FJH1100 Ultra Low Leakage Diode Alex On 3/31/2017 6:00 PM, Charles Steinmetz wrote: Mark wrote: I thought about using the clamp diodes as protection but was a bit worried about power supply noise leaking through the diodes and adding some jitter to the input signals... It is a definite

Re: [time-nuts] PLL Digital Loop Filter

it is tempting to use digital loop filter for PLL if a very low bandwidth is required, but with the large time constant is a problem ; the VCO will change it's frequency despite the tuning voltage remains constant and that is not so simple to model. 73 KJ6UHN Alex On 3/21/2017 4:39 AM,

Re: [time-nuts] Antique precision timing device without, > electronics

Professor Dr. Rohde of Rohde %Schwarz designed in the 1940-es one tuning fork oscillator for 400Hz which was to one crystal phase locked. The company built many exemplars from it. I have seen one working unit in 1967. 73 KJ6UHN On 3/17/2017 1:14 PM, Dan Kemppainen wrote: This is all cool

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 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

just be careful, because if you under-heat the cathode you could kill it 73 Alex On 2/13/2017 7:11 PM, Bob Camp wrote: Hi On Feb 13, 2017, at 8:15 PM, Scott Stobbe wrote: On Mon, Feb 13, 2017 at 6:41 PM, Bob Camp wrote: I think what you would

Re: [time-nuts] What to do with a 5061A/5061B with dead NiCds

it is a "ventilated flooded" battery? 73 if it s a flooded battery it is very easy to fix it On 2/5/2017 3:27 PM, Skip Withrow wrote: Hello time-nuts, I have 5061A and 5061B units with the battery option and dead battery packs. My question is what makes the most sense when refurbing these

Re: [time-nuts] 10MHz to 25MHz

once upon the time there was an other crystal material -- NOT quartz ! -- the Russian came up with it, perhaps Bernd [Neubig] remembers on that, what happened to that story? that crystal could be run at higher drive level, therefore it would be possible to make some better oscillators 73

Re: [time-nuts] Brass screws

Titanium, it is expensive but strong and non magnetic at all 73 KJ6UHN Alex On 1/17/2017 9:40 AM, Hal Murray wrote: jebponso...@gmail.com said: Though nominally made of copper and zinc, common brass often shows residual ferro magnetism because it is "recovered" metal and is contaminated

Re: [time-nuts] Nutty time-nuttery with WWVB

basically one could make a very good 60kHz clock distributor system, by running a large loop around the property, -- as long as the loop's length is much less than the wave length the current will be constant along the loop -- that way you will have reception inside the loop with vertical

Re: [time-nuts] Nutty time-nuttery with WWVB

sources of unmonitored QRM. On 10 Nov 2016 17:46, "Alex Pummer" <a...@pcscons.com> wrote: And how about that many, many "radiator" which are moving up and down with their carriers and don't give a damn about FCC Part 15 and radiating radiating day and night with

Re: [time-nuts] Nutty time-nuttery with WWVB

And how about that many, many "radiator" which are moving up and down with their carriers and don't give a damn about FCC Part 15 and radiating radiating day and night with substantial power, I meant that FFC approved and not approved switching mode power supplies, of which every household has

Re: [time-nuts] Nutty time-nuttery with WWVB

see here: http://ka7oei.blogspot.com/2013/03/getting-atomic-wwvb-clocks-to-work.html 73 KJ6UHN Alex On 11/10/2016 4:18 AM, Peter Reilley wrote: I have a few of those "atomic" clocks that receive WWVB to set the time. However since I live on the east coast they may only pick up the signal once

Re: [time-nuts] Sapphire oscillators

there was another sapphire oscillator company: Industry News / Test and Measurement Channel A Mobile Ultra-low Phase Noise Sapphire Oscillator

Re: [time-nuts] Normal operating specs of a Morion MV89?

Hi Brian which cap is failing in the MV89 oxco-s? 73 KJ6UHN Alex On 9/20/2016 2:41 PM, Bryan _ wrote: Any tips on resoldering the can, special solder or flux required? Quite often they can be found for a good price on Ebay, from what I have read they are a good OCXO minus the issue of the

Re: [time-nuts] Optical link connects atomic clocks over 1400 km of fibre

to shield against DC and low frequency magnetic field usually high permeability magnetizable material -- Permalloy, Mu-metal or similar is used, the field concentrates in the high permeability material and "behind it" is no left over magnetic field 73 Alex On 8/25/2016 11:10 AM, Magnus

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

directional coupler/circulator could be made with high bandwidth [ up to 1GHz ] operational amplifiers, that circulator will work from DC.. driving A/D converter input asymmetrically; drive trough a Guanella-choke, but match the output of the choke 73 Alex On 8/21/2016 3:21 AM, Attila

Re: [time-nuts] Heathkit clock available

Thank you Tom, I have a very primitive frequency comparator built some thirty years ego, which compares the line frequency to WWVb 60kHz, since the new format for WWVb was introduced it does not work so great any more, but it is still good enough to see if the line frequency is to fare off.

Re: [time-nuts] GPS antenna selection

Hi Herbert, just look the loss of the cable at 1500 MHz, and you will start to cry at 1500MHz tha cable will have cca 30dB for a 30meter long piecebasically that RG174 looks very nice with that small antenna but that is the only positive aspect. Meinberg in Germany has one up/down

Re: [time-nuts] Effect of EFC noise on phase noise

Ja Gerhard, bitte schicke mir den LTSpice file, Danke im Voraus und 73 KJ6UHN Alex On 8/1/2016 6:34 PM, Gerhard Hoffmann wrote: Am 02.08.2016 um 02:42 schrieb Bruce Griffiths: /"I'm working on a new amplifier based on IF3602 or BF862 FETs that can use 10u foil only."/ / / Similar to that

Re: [time-nuts] Q/noise of Earth as an oscillator

the Q factor could be derived from the modulation bandwidth of an oscillator [ the "old way" of measuring the Q of resonator of the running oscillator's ], therefore if we look the fluctuation spectrum of the frequency of an oscillator we could determine the Q. Any circular movement could be

Re: [time-nuts] NCOCXO anyone?

it is a way to use a carrier fc to make one SSB signal with fm modulation frequency, use just the side-band, , which have a frequency of fc + fm = fR, [fR/fc is a function of the SSB modulator carrier suppression capability,] fm could be from less than 1/2 fc any frequency to zero, if it is

Re: [time-nuts] NCOCXO anyone?

if you send the circuit to me Attila, I would try to help you 73 KJ6UHN Alex by the way aside of that ham license, I have some fifty years of experience and also an MSEE On 7/28/2016 11:03 AM, Attila Kinali wrote: On Fri, 22 Jul 2016 08:19:43 + (UTC) Bruce Griffiths

Re: [time-nuts] Q/noise of Earth as an oscillator

in case the Earth, the circular frequency of the Earth is equal of a sinusoidal wave's frequency, which is a projection of the Earth circular movement in a plain, which is perpendicular to the axis of the Earth. The Q of the Earth in interpreted as the quotient of the phase speed of the

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

That is interesting, since the Sola device has a to the line frequency tuned tank circuit in it, thus the output should not have to many higher harmonics and should look reasonable close to sinusoidal see here: http://www.rdrelectronics.com/russ/jun16/vs2.PDF 73 K6UHN Alex On 7/24/2016

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 quite 73 KJ6UHN Alex On 7/15/2016

Re: [time-nuts] Divide by 3

utilizing rising and falling edges makes the circuit output signal duty cycle sensitive to the input signal's duty cycle, and therefore the harmonic content will vary with the input duty cycle variation. 73 KJ6UHN Alex On 6/8/2016 9:47 AM, Richard (Rick) Karlquist wrote: The URL you cited

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

"Could you elaborate on this a little if time permits? I'm more a 'digital person' but it sounds interesting. Thanks in advance, Herbert " Yes Herbert here is; first divide 24MHz by two you get a very good quality absolute 50% duty cycle 12MHz, than you feed that 12MHx into mixer [which could

[time-nuts] Oleg' s PN test Re: A new member & PN test set

Hi Oleg, " If somebody is interested I can share all the information about it. " Yes I would be very interested to see your phase noise test at least the principle 73 KJ6UHN Alex On 3/28/2016 6:49 AM, Magnus Danielson wrote: Hi Oleg, Welcome. As always, it's a combination of tools,

Re: [time-nuts] Glass Envelope Quartz Crystals

I am perhaps to late now,I found the e-mail recently: " sockets can be an issue. With wire leads, you are asking for trouble. Functionally, there is little there is little difference between a glass package crystal and a metal package. About the only real one is the obvious - one has a

Re: [time-nuts] 10 MHz to 32.768 kHz converter

every injection locked oscillator has jitter, since the oscillator slowly --depend on the "tank circuit"s Q will return to it's original frequency, what will be interrupted by the next injection, therefore the oscillator will have a larger phase jump during the interaction with the pulse. "how

Re: [time-nuts] Inside a CTS 1960017 OCXO

sometimes high frequency oscillators could get in certain mode of operation the "blocking oscillation" see here: https://en.wikipedia.org/wiki/Blocking_oscillator, also it could happen, that the high frequency oscillation does not stops entirely, just undergoes an amplitude fluctuation, that

Re: [time-nuts] Inside a CTS 1960017 OCXO

Hi Dan how many of these oscillators have that low freq.hum? 73 KJ6UHN Alex On 2/27/2016 6:25 PM, Daniel Watson wrote: Hi, Attached is a plot of the output frequency difference from 10MHz during warm-up. I believe this indicates the crystal is SC cut. The VREF and EFC pins on the unit do

Re: [time-nuts] GPS Outage..

Hi Burt, you are more than right, but don't forget the bean counters! they have power over everything even logical thinking. 73 KJ6UHN Alex On 2/26/2016 8:57 AM, Burt I. Weiner wrote: Maybe I'm misreading what you're saying, but no matter the cause, it points out what can and does happen when

Re: [time-nuts] MTI 260-0624-D OCXO

Hi Mike, Would you be so kindly and post some pictures of the opening process of that OCSXO ? 73 KJ6UHN Alex On 2/18/2016 7:54 PM, time...@metachaos.net wrote: Bob, The vendor has said that they did not want the unit back. So... I opened it up. Crudely, I admit. I learned a few things. I was

Re: [time-nuts] MTI 260-0624-D OCXO

Hi Mike, look for any kind of radio-receiver, which would receive around 5MHz the old 60 meter broadcast ban, connect to power any kind of wire which could serve as antenna turn it on and try to find WWW at 5MHz, after that power up your 5MHz oscillator connect piece of wire to the 5 MHz

Re: [time-nuts] HP Reliability

Quite often it works, but sometimes it does not, not to long time ego I had to investigate one non-linearity case with a high mode QAM signal, there was something, what not supposed to be there, the only spectrum analyzer which had enough dynamic range was one from Rohde, 73 K6UHN Alex On

Re: [time-nuts] 10 MHz phase comparison using Bruel & Kjaer type 2971 phase meter

Hi Luca, look here: http://www.clmt.de/service-manuals/ 73 KJ6UHN Alex On 1/30/2016 12:49 PM, Luca Dal Passo wrote: Hi All, while i was looking for an hp k34-59991A phase comparator on ebay in order to make some long term measurements of frequency drift of a dut against a reference (by

Re: [time-nuts] HP Z3801A Internal Power Supply issues

power supply runs for a while, output current increases, but voltage stays correct -> problem is in the load circuit, load circuit working for a while load current increases, but it recovers after pause -> look for some tantalum capacitor in the load circuit, they recover often a few times

Re: [time-nuts] SMD TADD-1 distribution amplifier - seeking comments and suggestions?

That noise could come also from the environment, even trough ground-loop with the cox cable [ if the cable is connected between two grounds and the cable is long enough it will pick up noise since the noise-current generates voltage drop along the cable's shield, but the same field does not

Re: [time-nuts] Phase microstepper designs?

it is not a hint, for what you asked, but if you add a DC voltage to the output of the phase detector in an analog PLL the VCO phase could be adjusted, similarly if you add a constants to the input data of a phase accumulator of the NCO you could adjust the phase of the NCO but be aware, the

Re: [time-nuts] RG 6 U couplings

if you have a good TDR -- you need very short 50 to 20 pico-sec. rise time -- you could play with cable to cable, but but not having such TDR the connector is a relative bullet prof solution 73 KJ6UHN Alex On 12/5/2015 1:36 PM, Bob Camp wrote: Hi Don’t worry about it. You will be under 1 db.

Re: [time-nuts] GPS down converter question

and use low capacitive coupling, for simple adjustment of the bandwidth the filter could be set up and tested with these HAM, stile network analyzers too, if somebody explains me how to post pictures I could show the whole process, since I am doing it often for professional designs also 73

Re: [time-nuts] GPS down converter question

for 70MHz it does not hurt to match the cable to the filter at the antenna unit [down converter] end and also match the filter at the receiver upconverter end, the cable will pick up enough noise to overdrive the 70 something receiver's input [ the "outside" field will drive a current in

Re: [time-nuts] GPS down converter question

Meinberg down-converter: IF 34MHz: http://digilander.libero.it/maurit0/transito%20ebay/GPS%20R%20Meinberg/gpsant.pdf 73 KJ6UHN Alex On 11/30/2015 2:02 PM, Magnus Danielson wrote: Paul, Many GPS receivers only use 2,046 MHz bandwidth, but some use the full 20,46 MHz even if they only do C/A.

Re: [time-nuts] Downsizing dilemma, HP 3335A

no wonder, at that climate, who wanted to there, move to the west coast like Fluke did, and you will find people 73 KJ6UNH alias Dr.Dipl.Ing. Alexander Pummer, who once upon the time worked for you father On 11/11/2015 6:05 PM, KA2WEU--- via time-nuts wrote: I find it difficult in NJ to find

Re: [time-nuts] Digital Phasae Lock Loops

actually, that is a ketch 22, if the loop bandwidth is to low, you will have low noise , but it may will not lock at all, an other way to try to filter out the noise, also you may make the loop filter digital, but leave the the PLL analog, that could have the possibility to have the

Re: [time-nuts] UPS for my time rack

for a very similar application I am using a solar panel to charge the battery, but I have a vented NiFe battery, which is not sensitive of over charging or deep discharging, and has almost unlimited life time -- I have seen some in forklifts which were 60 years old and working... 73 KJ6UHN

Re: [time-nuts] UBLOX LEA-5T Programming?

Hi Bert, where could I get more inf on on that project? 73 KJ6UHN Alex On 10/10/2015 4:23 AM, Bert Kehren via time-nuts wrote: We did a GPS PLL using ublox M7 not for time nuts but for Hams no u processors, simple to build with readily available parts with performance of 1 E-10.. Hams still

Re: [time-nuts] Looking for ECL divide by 3 with symmetry

symmetry is better to look with spectrum analyzer, at good symmetry you should not see second harmonic 73 KJ6UHN Alex On 10/6/2015 12:28 AM, ed breya wrote: Problem solved - one missing connection was fixed, and it now runs just fine. Symmetry looks good on a scope, and the toggle rate is

Re: [time-nuts] algorithms and hardware for comparing clock pulses

the role of the diode is just to have a voltage drop? 73 KJ6UHN Alex On 9/23/2015 11:31 PM, Bill Hawkins wrote: Perhaps I can do this in words, as I have no schematic software. Start with the input to your favorite microprocessor's A/D converter. Connect it to a suitable (more later) capacitor

Re: [time-nuts] Chinese GPSDO 10 MHz error

it is a bit more complicated FLL need circuit which is sensitive to frequency difference, it looks always, PLL need a phase detector and has a capture range, which is depend mainly on the bandwidth of the loop filter there are combined phase /frequency detectors, which are sequential

Re: [time-nuts] looking for SMT oscillator SC cut, with no oven

But if he needs 100dBc at 10Hz that is Wenzel's stronghold [https://twitter.com/ultralownoise] look that: http://www.wenzel.com/wp-content/parts/501-04517.pdf 73 KJ6UHN Alex On 8/26/2015 2:38 PM, Gerhard Hoffmann wrote: Am 26.08.2015 um 22:04 schrieb Javier Herrero: I suppose that one of

Re: [time-nuts] wtd: WWVB info

Thank you very much Tom, 73 Alex On 8/24/2015 10:34 AM, Tom Van Baak wrote: Don, Alex, That IEEE PDF you're looking for has shown up on a .ru site. Google for Performance Analysis and Receiver Architectures and you'll see it near the top. I grabbed a copy to read and so far my PC isn't

Re: [time-nuts] wtd: WWVB info

there is a complete description: http://www.worldcat.org/title/ein-digitaler-dcf77-empfanger-mit-hoher-empfindlichkeit/oclc/245812903 unfortunately the closest is in Hamburg, but I am working on it 73 Alex On 8/24/2015 10:34 AM, Tom Van Baak wrote: Don, Alex, That IEEE PDF you're looking for

Re: [time-nuts] Cavity frequency air filled vs vacuum?

vacuum's dielectric constant is 1, air dielectric constant is 1.00059 at 1 atm, therefore the frequency with vacuum is higher, but with air it depend on pressure and humidity also 73 KJ6UHN Alex On 8/18/2015 9:49 PM, cdel...@juno.com wrote: Hi everyone! I'm trying to figure out what change

Re: [time-nuts] A few questions about Tboltmon

an other way to keep lightening damage away, to use one 1/4 wave length stud, and bank on it, that the lightening will not transmit with full power on the GPS frequencies.that trick is widely used on TV transmitter antennas, The only issue is that it is not very handy to have piece of

Re: [time-nuts] wtd: WWVB info

one DCF77 receiver is described here: http://www.compuphase.com/mp3/h0420_timecode.htm there are two files to download one for implement the MSF60 the other to implement the DCF77 * A script file that implements a simple DCF77 decoder http://www.compuphase.com/mp3/dcf77.zip, that you can

[time-nuts] Fwd: Trimble Thunderbolt CPR?

hi Skipp please let me know if you find something I am in a similar situation thank you in advance 73 KJ6UHN Alex Original Message Subject:[time-nuts] Trimble Thunderbolt CPR? Date: Tue, 28 Jul 2015 12:11:35 -0700 From: skipp Isaham via time-nuts time-nuts@febo.com

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

all of these oscillators, which do not deliver sinusoid output, have some threshold, which changes the form of the original sinusoid wave shape -- since the best phase-noise performance could be generated with a resonator and resonators inherently generate sinusoid wave form -- and that said

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

from Wildwood NJ? That of course is on 100 Khz. There is no Loran in California at this time. 73, Bill, WA2DVU Cape May -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Alex Pummer Sent: Monday, July 20, 2015 9:03 PM To: Discussion of precise time

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

Hi Paul where could I find the frequency of our Loran [the Californian Loran ] I have an old HP3586 radio receiver 73 Alex On 7/20/2015 1:50 PM, paul swed wrote: The system came up at 9 am and has been working well the austrons and SRS fs 700 are doing very well. Some static crashes and such.

Re: [time-nuts] how to find low noise transistors

some old but very good papers: Roger Muat, “Choosing devices for quiet oscillators”, Microwave RF, August 1984, pp. 166-170. Grant Moulton, “Dig for the roots of oscillator noise”, Microwave RF, pp. 65-69, April 1986. Julio Costa et al, “Extracting 1/f Noise Coefficients for BJT’s,” IEEE

Re: [time-nuts] how to find low noise transistors

Also a good paper: Phase Noise Reduction in Microwave Oscillators Alexander Chenakin, Phase Matrix Inc., San Jose, CA http://www.microwavejournal.com/authors/1981-alexander-chenakin-phase-matrix-inc-san-jose-ca

Re: [time-nuts] how to find low noise transistors

noise figure, noise voltage, noise current: http://www.ti.com/lit/an/slyt094/slyt094.pdf On 7/18/2015 2:16 AM, Attila Kinali wrote: On Fri, 17 Jul 2015 23:25:10 -0400 Charles Steinmetz csteinm...@yandex.com wrote: A pair of Zetex (Diodes, Inc.) ZTX849 or FZT849 actually have significantly

Re: [time-nuts] Firmware and antenna for Stanford Research FS700

generally larger transistors running at much lower current than they inteded for have lover noise figure, but much larger input and [Cbe] and feedback Ccb] capacitance, the same effect could be achieved putting --for AC!-- low noise transistors paralell [ signal voltage adds arithmetically,

Re: [time-nuts] how to find low noise transistors

but be sure that you have a hp4470B --a transistor noise analyzer [ http://www.testequipmenthq.com/datasheets/Agilent-4470B-Datasheet.pdf ] 73 Alex On 7/18/2015 8:47 AM, Pete Lancashire wrote: I agree with Bob, find a vendor you can trust and make sure you buy from an authorized distributor

Re: [time-nuts] 10MHz Square to Sine Wave Conversion

Charles Wenzel has very simple but good working solution, here is : http://www.wenzel.com/documents/waveform.html On 7/17/2015 8:20 AM, Richard Solomon wrote: I have a Mini-Circuits BLP-10.7 that I picked up at a Flea Market that does the job. And no, I do not want to sell it !! 73,

Re: [time-nuts] Firmware and antenna for Stanford Research FS700 Loran C frequency standard

MAT12 of ADI is good replacement and it is available at Mouser http://www.mouser.com/Search/Refine.aspx?Keyword=MAT12 On 7/17/2015 1:49 PM, Dr. David Kirkby (Kirkby Microwave Ltd) wrote: On 16 July 2015 at 08:05, Ole Stender Nielsen ols...@mail.tele.dk wrote: I use a home-made untuned loop

Re: [time-nuts] Leap Second results: cheap GPS/1PPS receivers

I logged NMEA from three cheap ($15-$50) GPS/1PPS receivers, the kind popular with hobbyists: parallax(good), reyax(good), adafruit(bad). what is the problem with the adafruit board? 73 KJ6UHN Alex On 7/1/2015 4:34 PM, Kasper Pedersen wrote: On 07/01/2015 05:23 PM, Tom Van Baak wrote: I

Re: [time-nuts] Casio Watches 13 Year Drift in Seattle

and that magic timing machine was the vibrograph, more abot it here: https://www.google.com/search?q=vibrographclient=firefox-ahs=Kyhrls=org.mozilla:en-US:officialchannel=nptbm=ischtbo=usource=univsa=Xei=iK6RVeX4FJTUoASf2KeIBQved=0CB4QsAQbiw=1024bih=507 we had one 73 KJ6UHN On 6/29/2015 12:16

Re: [time-nuts] Greetings from Australia

Not exactly Brek, as long as the position of the two stations, which are in contact with each other, does not vary in the time, you don't have to worry about Doppler effect, also if you are trying to get in touch in SSB mode in the 13cm band, you rather have a precise frequency reference and

Re: [time-nuts] Close in phase noise of microwave VCOs

Actually a YIG, even standalone has very good phase noise performance, as long as the tuning current is quite, once upon the time HP made some cheaper version of the 856x-es spectrum analyzers [ perhaps that was the 95xx ] they had the first LO just standing alone no PLL, and drifted away,

Re: [time-nuts] Divider circuit for Rubidium Standard

once upon the time at Gigatronics we compared logic devices noise and found that TTL were the quietest 73 KJ6UHN Alex On 5/20/2015 3:15 PM, Richard (Rick) Karlquist wrote: On 5/20/2015 11:22 AM, Magnus Danielson wrote: The older HP counter manuals explained it very nicely too, as they

Re: [time-nuts] EMI and CE certification

yes for transmitter antennas, but not for receiver antennas in Austria Germany Switzerland France Hungary one could have receiver antenna as long as he want, but the height is limited similarly as in the US 73 KJ6UHN Alex On 5/10/2015 7:15 AM, Chuck Harris wrote: My recollection is that

Re: [time-nuts] TrueTime AL-AK GPS receiver help

I am not so sure that it is applying to that case, but there are GPS antenna cable extenders which converting down the incoming GPS signal to frequencies at which the cable attenuation see here:

[time-nuts] Fwd: Harmonics suppression in ring oscillators

Hi Attila, just think how all ring/delay line oscillators working: a status change is traveling trough a delay, and after its arrival at the next active component it will release a new status change, which will travel and arrive at the next active component, and after once it will get back to

Re: [time-nuts] Mechanical 1PPS Oscillator Disciplining

yes, Ulrich's [ Rohde ] Father made a high precision clock around 1940, which had an electronically tuned mechanical oscillator. The vibrating 400Hz tuning fork is phase locked to a quartz crystal oscillator, that was the most precise clock at that time, and it worked as I have seen it at

Re: [time-nuts] Linear voltage regulator hints...

just thinking; OXCO is one ovenized crystal oscillator with temperature control, better to say temperature stabilizer, thus if the outside temperature changes the control loop shall keep the internal temperature constant-- by definition, the function of the temperature control loop could be

Re: [time-nuts] Linear voltage regulator hints...

Hi, George look for the book The art of electronics from Paul Horowitz and Winfield Hill, they describe how to design excellent electronic circuits, including power supplies 73 Alex On 12/11/2014 4:37 PM, xaos wrote: I don't know if this is the right time to ask this but here goes. I have

Re: [time-nuts] Linear voltage regulator hints...

about linear regulators: http://www.analog.com/static/imported-files/tutorials/MT-087.pdf 73 Alex ___ 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

Re: [time-nuts] tcxo

Thermal control circuits could oscillate at very low frequencies there is a tricky time constant -- the heat propagation between theater and the temperature sensor! 73 Alex On 12/7/2014 1:01 PM, Azelio Boriani wrote: You can go as simple as a PTC glued on the crystal to start with.

Re: [time-nuts] Lucent KS-24361 10 Mhz out success.

The OCXO in the TBolt beats the Morion parts by a wide margin. Bob in what way dies it? phase noise ? harmonics? standalone frequency stability? 73 Alex ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

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

by us in central California, we get 1kW/h square meter average around the year, the south even more, el Cajon will have today +29C° in the afternoon as of 23 of November 2014 73 Alex On 11/23/2014 9:49 AM, Poul-Henning Kamp wrote: In message

Re: [time-nuts] HP 5342A (18 GHz) vs 5352B (40 GHz) frequency counters

I have one of the source locking EIP, which works up to 90GHz, but used only for 60,xx GHz only, they are sometimes relative inexpensive available on e-bay, see here:

Re: [time-nuts] 10MHz LTE-Lite

Hi Said, do you have any information about how that TimePod 5330A works any principal description? 73 KJ6UHN Alex On 11/20/2014 2:08 PM, S. Jackson via time-nuts wrote: Hello Mike, attached is a 10MHz DIP-14 TCXO Phase Noise plot from a random LTE-Lite unit. I had sent out a 20MHz

Re: [time-nuts] 10MHz LTE-Lite

they are affordable and good: 585C/588C Frequency Counters CW, pulsed, and other time-varying microwave and millimeter-wave signals can be automatically measured by the 585C and 588C frequency counters. VCO measurements, chirped radar profiling, and frequency-agile system analysis

Re: [time-nuts] KS-24361 10 Mhz mod interesting document - older KS boxes

but there was a description; how to rejuvenate the rubidium bulb by cautiously warning it up, to remelt the rubidium 73 Alex On 11/20/2014 7:31 PM, paul swed wrote: I do agree its subjective. But my gut says bad is 2-3V I know they seem to run above 3. But whatever. When the blinkOmeter

Re: [time-nuts] Divide by five

check if you could get a 74AC161, which could be connected to divide by 5 at 125 MHz see here http://ecee.colorado.edu/~mcleod/pdfs/IADE/references/74AC161.pdf to be sure to work at 125MHz run with 5,5 to 6V... 73 Alex On 11/7/2014 1:12 PM, Joseph Gray wrote: I need to divide a 125 Mhz

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

Hi Marullo look there: http://www.aade.com/dfd.htm almost plug and play frequency display for ham radio 73 KJ6UHN Alex Hello, just wanted to know if there is any very cheap pre programmed pic or something similar to get frequency of a Yaesu FT-102 radio. I need it to know its frequency,

Re: [time-nuts] Lucent KS-24361/Z3812A GPSDO initial setup

use nickel-iron battery [Edison Accumulator] which is not sensitive to deep discharge, over charge and last for min twenty years - unfortunately it does not fit into the American business model --because it last to long--so it is not produced in the US any more. 73 Alex On 10/25/2014 5:30 PM,

Re: [time-nuts] If any of your USB devices have stopped working lately...

just look that: http://zeptobars.ru/en/read/FTDI-FT232RL-real-vs-fake-supereal 73 Alex ___ 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] Some specs for MTI Millren 260 OXCOs

I got two used from China, they are six years old that is the standard time when the whole board get replaced in a cell phone base station they looking like the drawing in the data sheet except pin # 6 is missing but it is not connected anyway they have EFC pin and it is working I tried it

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

yes Charles you are right, but you could use a trick as you derive the LO from the high stabile oscillator which is locked to the down-converted carrier the IF, and the loop is locked only if the IF and the LO frequencies having the correct value, but that loop change the feedback polarity

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

No that is to much, except if you overdrive it and you are so lucky that after it broke it is still working on a different frequency, but I would suggest check your frequency counter too, because 3% off of a clock frequency wold make the clock almost unusable not just for time nuts... 73

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