Re: [time-nuts] 5950 Crystal impedance meter manual

The DG8SAQ vector network analyzer has a built-in routine to characterize crystals. It may not be "correct" to simply plug them on port 1, but the results are quite reasonable. The right thing to sort out a bag of NOS crystals and finding the good ones or to get a somewhat realistic

Re: [time-nuts] Some thoughts about Crystal Oscillators

Am 15.04.2018 um 20:27 schrieb Ulrich Rohde via time-nuts: Before I forget it, Bernd Neubig seems to build the worlds best Colpitts circuit 100 MHz oscillator and uses my published thought to use the crystal filter as the noise filter to the next stage. I was never able to get the Driscoll

Re: [time-nuts] Some thoughts about Crystal Oscillators

Am 17.03.2018 um 00:57 schrieb Ulrich Rohde via time-nuts: https://synergymwave.com/articles/2013/04/full_article.pdf This may be still of interest... happy weekend, 73  de Ulrich, N1UL Since the weather did not look so nice this weekend, I canceled a 2-day motorcycle tour and tried

[time-nuts] Wavecrest DTS2075

I have been offered a DTS2075. Is this generally regarded as a step forward if you already have a SR620 or is it more or less the same league? Are there any hidden pearls or caveats? TIA and best regards, Gerhard ___ time-nuts mailing list --

Re: [time-nuts] Cheap jitter measurements

Am 10.04.2018 um 01:03 schrieb Gary E. Miller: Yo Hal! On Mon, 09 Apr 2018 13:53:21 -0700 Hal Murray wrote: The API for the kernel clock can be read to a ns. I don't see ntpd having much use for finer grain than that. I should look at the source to see what the

Re: [time-nuts] TV Signals as a frequency reference

Am 31.03.2018 um 00:13 schrieb Hal Murray: fgr...@otiengineering.com said: Now that analog TV has gone away, so have these signals. What do the local TV stations use for a frequency reference? Are there low cost receivers that also produce a good reference frequency? The German

Re: [time-nuts] ULN regulator with more current capability than LT3042?

Am 20.03.2018 um 10:09 schrieb Attila Kinali: Hoi Gerhard, On Sun, 18 Mar 2018 21:41:28 +0100 Gerhard Hoffmann <dk...@arcor.de> wrote: Use the LT3042 with an external power transistor, such as D44VH10G: < https://www.flickr.com/photos/137684711@N07/29197476530/in/album-72157662

Re: [time-nuts] Use the LT3042 for retrofit?

Am 21.03.2018 um 23:03 schrieb Hal Murray: kb...@n1k.org said: [context is EFC control voltage] Generally, the biggest factor is the voltage drop from the oven current getting into the EFC “loop�. Its actually pretty hard to keep them separate. Is there a fundamental problem, or is it

Re: [time-nuts] ULN regulator with more current capability than LT3042?

Am 18.03.2018 um 21:13 schrieb John Ackermann N8UR: Reviving the conversation about superb voltage regulators, I am looking for one to run the analog and PLL bits of a high performance frequency synthesizer chip. The current drain looks to be about 160-180 mA at 1.8 V, which is

Re: [time-nuts] ?==?utf-8?q? Suggest time-and-tech related locations in Switzerland

Am 15.03.2018 um 19:07 schrieb Henk Peek: Hi Dave, I, you and more time-nuts (?) go to the Hamradio meeting Friedrichshafen June 1 - 3. Is there interest in an informal be together? I also plan to go to Friedrichshafen. WRT Switzerland, I'll leave that to Attila.  It's his home turf, after

Re: [time-nuts] Frequency deviations in Europe affect clocks

Am 07.03.2018 um 22:09 schrieb Poul-Henning Kamp: This explains why my oven clock and the time/temperature display on the building outside my apartment in Switzerland are six minutes slow since January. It was a great mystery to me. Can you get a picture of this ? It would be wonderful to

Re: [time-nuts] Need a Watch Recommendation

Am 05.03.2018 um 14:01 schrieb Bob kb8tq: If you want to stick with WWV, the Citizen “Ecco Drive” (solar) WWVB ECO-Drive watches are a pretty good option. Until I caved in to the wonders of a cell phone on my wrist, I used them for many years. Nothing to fuss with. No battery to die on you.

Re: [time-nuts] Microsemi up for sale?

Am 04.03.2018 um 04:04 schrieb Richard (Rick) Karlquist: When I was working on fiber optic communication test, I remember hearing about lasers that were "tuned" with variable Peltier coolers.  Power consumption is critical in a cesium standard that can run on batteries.  Maybe the power

Re: [time-nuts] 50 ohm drivers

Am 04.03.2018 um 03:17 schrieb David C. Partridge: Brice said: . Some fast CMOS devices (esp clock drivers) have an output R close to 50 ohms as they are intended to drive 50 ohm source terminated transmission lines. Any in particular that you'd recommend? I need to drive a 50ohm line

Re: [time-nuts] Allan variance by sine-wave fitting

Am 26.02.2018 um 20:20 schrieb Tom Van Baak: Fun fact -- there's a wide spur at ~2 Hz on the 5065A phase noise plot. What do you think that is? On a hunch I opened the front panel and reset the blinking amber battery alarm lamp, and voila, that noise went away. Makes sense when you think of

Re: [time-nuts] Replacement A9 boards for the HP 5065A

Am 25.02.2018 um 13:46 schrieb Azelio Boriani: The part number BFC234421475, on seems to be a Philips product, 2500 available, for 49.28 UAH (Ukrainian Hryvnia, that is 1.77 USD). A mysterious capacitor... Why not go to Mouser or DK, as usual? Or to the

Re: [time-nuts] Replacement A9 boards for the HP 5065A

Am 25.02.2018 um 00:45 schrieb cdel...@juno.com: Hi, I'm working to make some replacement A9 boards for the HP 5065A to the new style schematic. Will share the Gerber file when done. The integrator capacitor is a 1986 vintage TRW 5.0ufd 50V 10% .42"DX1.0"L axial. Of course it has an HP

Re: [time-nuts] power supply design Re: Slightly OT: interest in a four-output, > ultra-low jitter, synthesizer block?

Am 26.01.2018 um 05:26 schrieb Mark Goldberg: On Thu, Jan 25, 2018 at 8:51 PM, jimlux wrote: What we've done is switcher from wide range bus (9-24V) to 8V, 60 dB ultimate attenuation low pass, switcher 8V to 5V(e.g.), 60 db low pass, linear with great HF rejection

Re: [time-nuts] minimalist sine to square

Am 19.01.2018 um 20:31 schrieb Tom Van Baak: John's TADD-2-mini [1] uses the Wenzel sine-to-square converter. It performs very well but requires +10 V. I'm looking for a solution that works at 5 V (e.g., USB powered) and also uses fewer parts. Wenzel also mentions using a differential line

Re: [time-nuts] Down-conversion to IF and sampling

Am 11.01.2018 um 10:57 schrieb Stephan Sandenbergh: I plotted the result for a few oscillator drift rate values. It seems that the 'extra' error introduced by the imperfect ADC time base would be negligible for many applications for OCXO drift rates or better. This is likely the reason why it is

Re: [time-nuts] AM vs PM noise of signal sources

Am 07.01.2018 um 17:05 schrieb Arnold Tibus: but I see quite often mentioned the 'Wein bridge'. (Wein in german is 'vino' or 'wine' ;-) Not of real technical importance, but shouldn't this not be correctly called a 'Wien bridge'? As I know that this tricky circuit was developed by Max Wien

Re: [time-nuts] Determining Allan Deviation From Interpolated Peak Frequency Readings

Am 16.12.2017 um 11:57 schrieb Attila Kinali: [1] "Oscillator metrology with software defined radio", by Sherman and Jördens, 2016 https://arxiv.org/abs/1605.03505 I have seen this paper before. Unfortunately, it is a lot more work to implement than what I have already done. I am really a

Re: [time-nuts] Recommendation for cheap GBIP adapter for Linux

I have bought a Prologix GPIB/USB controller. There is a LAN version also. The German distributor is stantronic.de. You can get mine for a limited time to see if it fits. I was able to solve my own problem via LAN w/o adapter. regards, Gerhard Am 18.11.2017 um 20:04 schrieb Attila Kinali:

Re: [time-nuts] Lucent RFTG-u REF0-REF1 cable

Am 15.11.2017 um 05:06 schrieb Jerry Hancock: problem solved. I also have to get the 10Mhz out of the REF1 but that looks easy. It is best to just double the 5 MHz that comes straight from the MTI-260 oven. <  http://www.hoffmann-hochfrequenz.de/downloads/DoubDist.pdf > regards, Gerhard

Re: [time-nuts] Spice simulation of PSRR and phase noise

Am 22.10.2017 um 22:58 schrieb Bruce Griffiths: Hoi Attila Since close in phase noise can result from up conversion of supply noise etc via circuit non linearities, using an AC analysis won't work. Only transient simulation or perhaps analytical modelling of the various non linearities will

Re: [time-nuts] Fast Rise/Fall Time Pulser

Am 10.10.2017 um 22:25 schrieb Magnus Danielson: This one, if you read what is written there: http://www.analog.com/en/products/linear-products/comparators/adcmp572.html#product-overview I have used a ADCMP580 comparator on a home etched board with semi rigid for the outputs. This is

Re: [time-nuts] 5071A Reference Oscillator ?

It was a 10811 that I modified to get more tuning range by replacing the stock varactor with a hyperabrupt type, probably my favorite MV209, but I can't remember for sure. Just yesterday, I designed a phase modulator using an MV209. Joined the club of obsolescence. Digikey: No Stock, no

Re: [time-nuts] sine to square wave circuits - performance data?

Am 05.10.2017 um 00:33 schrieb Bob kb8tq: Hi The other issue could be that no diode ever operates instantaneously …. Bottom line is indeed that clipping in protection diodes is not a good idea. External diodes …. who knows …. And when it clips, it provides a low impedance connection between

Re: [time-nuts] TAPR TICC boxed (input protection)

Am 08.04.2017 um 17:52 schrieb David: If they are not being tested, then where is the maximum specified leakage number coming from? For a small signal bipolar transistor it will typically be 25nA, 50nA, or 100nA, but the InterFET datasheet (1) shows 10pA maximum and 1pA maximum for the A

Re: [time-nuts] Single ended or differential input to TDC chip

Hi, Attila! Somewhere you'll have to produce sharp differential edges and this semi-analogue stuff is probably hard on a chip shared with thousands of other gates and a digital process. Going differentially into the chip will reduce the effects of ground bounce etc a lot. This is what you can

Re: [time-nuts] Optimal oscillator topology for diffrent frequency range

Am 06.02.2017 um 14:08 schrieb Richard (Rick) Karlquist: Agreed, for low phase noise FLOOR, it is imperative to take the signal out through the crystal. However, for close in noise (say ADEV at t=1), the Driscoll has worked well for me. I have been able to reach ADEV = 10^-11 at 100 MHz at

Re: [time-nuts] Power Problems Lucent KS-24361, L101 & L102

Am 05.02.2017 um 04:29 schrieb Hal Murray: b...@baylorhill.com said: Where does pin three (P1) connect. I may have trashed both units. Are schematics available. I don't know of any schematics. I would take it apart and see if anything is connected to any of the other pins on those

Re: [time-nuts] Thunderbolt Harmonics

Am 18.01.2017 um 22:12 schrieb Bob Camp: Yeah, but it's easier (cheaper if you're paying for labor) just to buy a box of 10 filters at $30/each and stack them Be *very* careful cascading those Min-Circuits filters without putting some sort of isolation between them. You can get all sorts of

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

Am 08.12.2016 um 01:20 schrieb Scott Stobbe: Yes, the short hand I like to use is 4 nV*sqrt(R/1000). 2 nV/rthz off a bandgap is pretty darn impressive, that includes a delta vbe gained up ~10x. Methinks the advantage comes from converting their reference (whatever that may be) to a really

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

Am 08.12.2016 um 00:50 schrieb jimlux: On 12/7/16 3:32 PM, Richard (Rick) Karlquist wrote: On 12/7/2016 12:16 PM, Clint Jay wrote: I was looking for a low noise regulator to power a log amp/detector earlier this year and was rather surprised to find the 78xx regulators were considerably better

Re: [time-nuts] precision timing pulse

Am 18.11.2016 um 02:18 schrieb Bob Camp: If you head of into ARM land (or even FPGA’s) there is a bit of a gotcha. If you want to run a 10 MHz input and a PPS output, you need a counter with at least 24 bits. The peripherals on ARM chips are all over the place. Some have very fancy timers, but

Re: [time-nuts] Secondary phase noise standard & FE405

Am 12.11.2016 um 23:52 schrieb Bob Camp: Hi Yes, the FE-405 uses a DDS and a cleanup. Inside the cleanup loop the DDS spurs come straight through. Since the FE-405 compensates for all sorts of things, the DDS moves around a lot. Even a one bit change on a DDS will move spurs around. With an

[time-nuts] Secondary phase noise standard & FE405

I have made an experimental secondary phase noise standard, as F.Walls would call it. In the end, it's inspired by his paper. There is not much to it. There is a Mini Circuits PSC2-1 splitter that is fed from an oscillator or other source. The splitter divides it into a clean output that

Re: [time-nuts] China Oscillator Alternative

Am 10.11.2016 um 07:02 schrieb Ed Armstrong: These have 10Mhz & 15Mhz out, which frequency is the OCXO? A 5 MHz MTI-260 See the text I linked to a few days ago. On 11/9/2016 7:18 PM, Perry Sandeen via time-nuts wrote: List, After all the problems that Bob Camp has noted with surplus

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

Am 06.11.2016 um 22:16 schrieb Bryan _: By far the easiest method. https://youtu.be/3jxSKaIRhAQ That must be the guy who removes the e**y MV-89s from China from their boards. At least two of mine have scars that are best explained by such a tool. regards, Gerhard

Re: [time-nuts] Newbie With a Z3801 Problem

Am 05.11.2016 um 12:51 schrieb Bill Riches: Hi Mark, Thank you for working with the KS24361. Looking forward to when the program will be available. Any ideas on being able to use the 1 PPS signal out of the KS24361 to drive SL sound card calibration? It is a weird pulse and someone

Re: [time-nuts] Thinking outside the box a super reference

Am 05.11.2016 um 00:45 schrieb David: On Fri, 04 Nov 2016 14:39:54 -0700, you wrote: 87-Rb has a half life of something like 4.9e10 years — you'll be waiting a while for that strontium. /gp Various online sources say that natural rubidium is radioactive enough to fog photographic film in 1 to

Re: [time-nuts] our favorite topics

Am 30.10.2016 um 01:56 schrieb KA2WEU--- via time-nuts: The Parzen book was on my list (Amazon ), I find these books, including Rhea's book practically useless as they do not provide the necessary non -linear noise analysis, and do not have real live examples with test data. Cerda's

Re: [time-nuts] Thunderbolt spurs on 10MHz output at 100Hz and 200Hz from signal.

Am 22.09.2016 um 00:24 schrieb Bruce Griffiths: Another issue is the requirement to trim the current sink for low output offset. And _that_ FET is made from Unobtainium. If one takes advantage of the fact that the PLL imposes a low frequency cutoff to the PN measurements, the amplifier input

Re: [time-nuts] Thunderbolt spurs on 10MHz output at 100Hz and 200Hz from signal.

Am 22.09.2016 um 00:24 schrieb Bruce Griffiths: For the later, Bruce commented that an jFET input stage would probably be more quiet. Gerhard Hoffman has designed a similar I must insist in my second "n" Hoffmann :-) system[3] that uses a couple of paralel low noise opamps instead of a

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

Am 01.09.2016 um 06:56 schrieb Gerhard Hoffmann: Am 01.09.2016 um 05:35 schrieb Charles Steinmetz: The suggestion to use LT3042s is a good one, but note that it has an output current rating of 200mA. The Tbolt needs ~250mA at +5v, and ~700mA at +12v [at startup -- but only ~150mA steady

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

Am 01.09.2016 um 16:36 schrieb jimlux: On 8/31/16 10:24 PM, Gerhard Hoffmann wrote: Am 01.09.2016 um 06:07 schrieb Bruce Griffiths: I have a quad LT3042 PCB that I must get around to assembling.One potential issue with the LT3042 is the relatively high noise at low frequencies when

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

Am 01.09.2016 um 07:44 schrieb Charles Steinmetz: The datasheet shows both NPN and PNP current multipliers. Just curious -- did you choose the NPN circuit for theoretical considerations, and if so what was your reasoning -- the lower open-loop output impedance? More belly feeling. The PNP

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

Am 01.09.2016 um 05:35 schrieb Charles Steinmetz: The suggestion to use LT3042s is a good one, but note that it has an output current rating of 200mA. The Tbolt needs ~250mA at +5v, and ~700mA at +12v [at startup -- but only ~150mA steady-state, depending on ambient temperature]. LT3042s

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

Am 03.08.2016 um 18:30 schrieb Richard (Rick) Karlquist: 1. Back in those days at least, there were vendors who supposedly specialized in providing low noise zener diodes. The particular breakdown voltage of zener diodes was important. IIRC, at low voltages, it is a true "zener" diode and at

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

Am 02.08.2016 um 22:24 schrieb Bruce Griffiths: Uually a zero is needed in the bias stabilisation loop to eliminate low frequency gain peaking. 2 Meg across the 3.3uF remove the peaking. Nevertheless the circuit still has problems with its time constants. Weird things happen if you let the

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

Am 02.08.2016 um 09:14 schrieb Bruce Griffiths: ... and a screen dump for the LTspice challenged ;-) Gerhard ___ 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] Effect of EFC noise on phase noise

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 published by Groner in Linear Audio? / / I know that Groner exists from some web site, but had no personal contact. Also I don't read

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

Am 01.08.2016 um 22:16 schrieb David: This duplicates the problems encountered when trying to quantify low frequency noise from a voltage reference; it is difficult to make an low frequency high pass filter with lower noise than the lowest noise references and the capacitor is the problem. I beg

Re: [time-nuts] OXCO Spurious Output at Line Frequencies

Am 13.07.2016 um 04:38 schrieb Mark Sims: A friend on mine once worked on projects to build very sensitive magnetometers (submarine detection and space probes). Their test lab was in the middle of a square mile of land selected for its low magnetic residue properties. The building was

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

Am 08.07.2016 um 08:52 schrieb Poul-Henning Kamp: A new A6 with four high quality DC/DC converters and some extra filtering would be a really big improvement both heat and efficiency wise. I keep wondering how this tiny transformer in the SR620 can power that baking tray full of ECL.

Re: [time-nuts] Cable length calibration

Am 29.06.2016 um 22:07 schrieb Gary E. Miller: TDR. The GPS already sends a voltage down the cable to power the antenna. Send a sharp down the cable and see when the reflection comes back. Even some of my cheap managed ethernet switches can do that. What reflection? If the antenna preamp

Re: [time-nuts] Transformer inrush current and transformer simulation

Am 08.06.2016 um 02:31 schrieb Mike Monett: I was not interested in examining the frequency response, saturation effect or core losses. These are only important after the core goes into saturation. I was only interested in the result of switching at the peak or at the zero crossing. This is

Re: [time-nuts] Maser 0.7 nsec jumps solved

Am 25.05.2016 um 18:59 schrieb Mike Monett: This analysis shows switching at 0V is the best option. No, it doesn't. :-) First, the single inductor does not represent a transformer; the second inductor and the coupling declaration ( style: K1 L1 L2 0.99 or so) and the load are missing. The

Re: [time-nuts] Maser 0.7 nsec jumps solved

Am 23.05.2016 um 05:15 schrieb Jim Palfreyman: As far as a remedy goes we are going to try a solid state relay that only switches on at 0V in the AC waveform. This should slow the inrush current, and hopefully the magnetic impulse. In the context of transformers and motors, switching on at 0V

[time-nuts] semi-dead FTS 1000

Hi, I won a FEI 1000A oscillator here on local ebay, but it turned out that the heater does not work anymore. It oscillated, but drew only 30 mA or so instead of ?600 mA in the heatup phase. It was taken back, but the seller who inherited these things is a ham, too, and he would like to dissect

Re: [time-nuts] High rate, high precision/accuracy time interval counter methods

Am 09.05.2016 um 10:08 schrieb Magnus Danielson: Hi, On 05/08/2016 09:53 PM, Attila Kinali wrote: True and not true. Yes, there are many ADCs that do high conversion rates, but these are optimized for piplined applications where conversion happens at a constant rate. Ie they expect a

Re: [time-nuts] High rate, high precision/accuracy time interval counter methods

Am 08.05.2016 um 21:53 schrieb Attila Kinali: True and not true. Yes, there are many ADCs that do high conversion rates, but these are optimized for piplined applications where conversion happens at a constant rate. Ie they expect a constant conversion clock with a constant rate. If you want to

Re: [time-nuts] High rate, high precision/accuracy time interval counter methods

Am 08.05.2016 um 21:53 schrieb Attila Kinali: ... Maybe I was too short. We have control over the charging current source, and when we switch it off, the status quo is kept. Then when the ADC is done, we can simply short the capacitor in the next clock/s to prepare for the next cycle.

Re: [time-nuts] High rate, high precision/accuracy time interval counter methods

Am 06.05.2016 um 01:00 schrieb Mike Monett: I have been thinking along the same lines, to combine multiple OCXOS's to obtain lower phase noise. But an N-way Wilkinson could get tedious. After you calculate the impedances for each leg, you then have to convert them to lumped-element equivalents

Re: [time-nuts] High rate, high precision/accuracy time interval counter methods

Am 05.05.2016 um 01:55 schrieb Bruce Griffiths: On Wednesday, May 04, 2016 02:22:22 PM Gerhard Hoffmann wrote: But we stayed with a classical time stretcher, and my private project pipeline is already full. Talking about my own pipeline: I have finally ordered today the first 20 samples of my

Re: [time-nuts] High rate, high precision/accuracy time interval counter methods

Am 04.05.2016 um 10:46 schrieb Bruce Griffiths: Integrating A Time interval to charge TAC at the front end of a capacitive charge redistribution SAR ADC should allow a conversion time of 300ns or so.. Using 16 such TDCs should permit 1ps resolution with a 50MHz timestamp rate without too many

Re: [time-nuts] 1 PPS 50-ohm driver

Am 17.04.2016 um 16:59 schrieb Wojciech Owczarek: A slightly naive question(s) perhaps, so do excuse me, but I reckon this is a good opportunity to ask since I am approaching the same design questions (this is a 1PPS in + 1PPS out driver for the Beaglebone Black, to/from its PTP clock). This

Re: [time-nuts] Fast risetime pulse generator

Am 13.04.2016 um 07:03 schrieb Bill Byrom: I agree with earlier comments that the Analog Devices SiGe voltage comparators appear to be a good choice, with 37 ps typical rise/fall (20%/80%): http://www.analog.com/media/en/technical-documentation/data-sheets/ADCMP580_581_582.pdf The evaluation

Re: [time-nuts] Fast risetime pulse generator

Am 12.04.2016 um 22:30 schrieb BIll Ezell: (cross-posted to volt-nuts) After paying only limited attention to this topic, I suddenly have a need for a pulse generator that has <150 ps risetime and a pulse width of at least 2 ns. 100mv amplitude or more is fine. I've looked at the classic Jim

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

Am 30.03.2016 um 21:20 schrieb Bruce Griffiths: Conical inductors are available that are effectively resonance free to 40GHz but the largest value is around 10uH. In principle one could wind one's own conical inductor with a larger value, However an iron powder (carbonyl iron - available from

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

Am 29.03.2016 um 16:53 schrieb Charles Steinmetz: (10) Phase_detector_with_low_flicker_noise_BARNES_etal_NIST_2011: Describes a DIY double-balanced mixer phase detector using diode-connected 2N transistors. [Note that only the flicker noise is improved -- the white noise floor is

Re: [time-nuts] Instrument BASIC

Am 02.03.2016 um 19:04 schrieb John C. Westmoreland, P.E.: Magnus, This was the best answer I got so far - I am sure this isn't what you're looking for: http://www.ebay.com/itm/HP-89441A-Vector-Signal-Analyzer-Opt-1C2-AY9-UFG-AY7-AYA-/252278222960?hash=item3abcf43070:g:uRMAAOxyNo9SojsE I have

Re: [time-nuts] MV89A / MTI-260 / HP10811 carrier board

Am 27.02.2016 um 16:15 schrieb Bob Camp: Hi You will run into the same problem on the Altera side. Their “super suite” is called Quartus and the latest free version only supports the newer parts. Once you get a few generations back, you need to download an older version. That’s not impossible

Re: [time-nuts] MV89A / MTI-260 / HP10811 carrier board

Am 25.02.2016 um 22:23 schrieb Magnus Danielson: Interesting. I would consider the PICDIV such as that of TADD-2, which has the benefit of producing a range of frequencies, so that a suitable can be selected as matching the needs. I've found it very useful property of the TADD-2, where I have

Re: [time-nuts] MV89A / MTI-260 / HP10811 carrier board

Am 25.02.2016 um 20:06 schrieb Anders Wallin: Hi, looks quite useful! What's the benefit of the Xilinx CPLD (2-3 dollars/euro) over a PICDIV (<1 dollar/euro) ? My work would cost more than 1-2 € Sync-input for the PPS-output would be useful. Also a PPS LED that blinks. If the PPS-divider is

[time-nuts] MV89A / MTI-260 / HP10811 carrier board

HI, I have made some progress on my crystal oven carrier board. It will offer a home for one of these: - MTI-260 - Morion MV89A - HP 10811-611 It provides regulated voltages for either of them, and the needed electronics. It will be possible to lock the resident oscillator to an

Re: [time-nuts] low noise multiplication to 100 MHz

Am 25.01.2016 um 18:20 schrieb Graham / KE9H: There are clock distribution parts designed to do this low noise frequency conversion and distribution. Consider TI LMK04100 150 fs class jitter. But only if you integrate the noise only from 12 kHz offset to 20 MHz. It is a telecom spec.

Re: [time-nuts] low noise multiplication to 100 MHz

Am 22.01.2016 um 22:40 schrieb jimlux: the oscillator is a HCMOS output, so figure swinging about 3.5V Output.. I'm feeding differential clock inputs on ADCs. I'll bet a +/- 300mV swing would work. 4)Title said "Low Noise" needs better definition as to what kind of noise and how far down.

Re: [time-nuts] low noise multiplication to 100 MHz

Am 21.01.2016 um 15:43 schrieb jimlux: My tiny 100 MHz low noise OCXOs are unexpectedly delayed at the mfr, and I'm looking at alternative schemes. One is to get 10 or 20 MHz OCXOs (typically in stock) and multiply them up. I've got the Wenzel ap notes on 2diode and using HCMOS (and I've used

Re: [time-nuts] Generating a solid PPS from 10Mhz source

Am 15.01.2016 um 10:14 schrieb Bruce Griffiths: For lowest jitter the gate power supply noise needs to be very low.Biasing the input at 50% supply helps somewhat but the gate threshold is never exactly 50% and the low pass filtering effect of the coupling capacitor increases the contribution

Re: [time-nuts] Generating a solid PPS from 10Mhz source

Am 16.01.2016 um 15:03 schrieb Bob Camp: Unlike the world of lithography, the dicing process has not made a lot of progress. Decades ago a 1mm x 1 mm die was about as small as you could get. From what I can see that has not dropped by more than a factor of two in 40 years (if at all). Yes,

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

Am 10.01.2016 um 22:47 schrieb Alexander Pummer: and there was also a frequency/phase detector from Analog Devices, which took care about that dead zone AD9901. 73 KJ6UHN Alex 73, Gerhard, DK4XP ___ time-nuts mailing list -- time-nuts@febo.com To

Re: [time-nuts] Need tiny 5MHz 10x amplifier

Am 29.11.2015 um 01:35 schrieb Poul-Henning Kamp: I need to convert a 5MHz 0.2Vpp AC coupled sine signal to a 3.3V CMOS compatible logic signal. The "default" comparator based circuit either requires a negative supply or 4 resitors for biasing the input and setting the zero level. (The

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

Am 28.10.2015 um 19:22 schrieb KA2WEU--- via time-nuts: This oscillator seems to have been more a frequency standard then a noise standard. Today's 10 MHz oscillators are different/better, such a crystal is no longer available/made. Yes. Rubiola gives it the credit of being able to be

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

Am 28.10.2015 um 23:04 schrieb Richard (Rick) Karlquist: Do you have a specific URL for "hacking oscillators"? I can't find it on Rubiola's web site. It is a chapter in his book where he analyzes the form of the noise spectra. ___ time-nuts mailing

Re: [time-nuts] Unified VCXO Carrier Board

Am 27.10.2015 um 13:50 schrieb Charles Steinmetz: Gerhard wrote: Since the LM329 was mentioned above, I tried it also. Another surprise. HOW CAN THEY MAKE SUCH A NOISY SUBSURFACE ZENER??? 0 dB = 1nV/sqrt Hz The datasheet for both NS and LT LM329s shows broadband noise of <70nV/sqrtHz, with

Re: [time-nuts] Unified VCXO Carrier Board

Am 24.10.2015 um 22:21 schrieb Bruce Griffiths: On Saturday, October 24, 2015 09:03:21 AM Charles Steinmetz wrote: The spec sheet says both TimePod inputs accept -5 to +20dBm into 50 ohms. -5dBm is less than 0.4Vp-p, which requires less than +/-4mA from the source, so a 0-5v comparator output

Re: [time-nuts] Unified VCXO Carrier Board

Am 23.10.2015 um 21:27 schrieb Charles Steinmetz: Use medium-speed transistors, bias both bases from the same low-noise voltage reference such as an LM329, capacitively couple the emitters, and use a higher supply voltage, for starters. I use This evening, I have measured some oh so noisy

[time-nuts] really Idle Lucent KS24361

Is there an easy way to get the Z3811/12 into a state where they just leave their oscillators alone? I do not mean holdover as when I just pull the GPS antenna plug; then they will probably try to correct for drift based on learned history. I want the "pure" MTI-260s. And if I build in

Re: [time-nuts] Unified VCXO Carrier Board

Am 22.10.2015 um 22:04 schrieb Charles Steinmetz: As I have said before, there is very little if any advantage to using an LTC6957 at 10MHz (as opposed to using a run-of-the-mill comparator), What do you consider a run-of-the-mill comparator? LM139, LMV7219, AD8561, ADCMP580? and the

[time-nuts] Unified VCXO Carrier Board

I'd like to design a unified VCXO Carrier Board to these requirements: 1. It can host one of the the following VCXOs: 1.1. HP 10811A-6111 (as from 5370A) 1.2 Morion MV89A 1.3 MTI 260 1.4 CV-950 1.5 Timetech 1.6 Axtal 1.7 Pascall 2. It provides unified tuning: 0V = lowest possible

Re: [time-nuts] Unified VCXO Carrier Board

Am 22.10.2015 um 19:58 schrieb Garry Thorp: To make things a bit more complicated, Pascall oscillators' tune voltage range is 0 - 10V. Tuning to the nominal frequency is likely to require >5V. That would not stop me, that is in the reach of most op amps, but I was quoted €4k2 + 19% VAT for

Re: [time-nuts] [Bulk] Unified VCXO Carrier Board

Am 22.10.2015 um 18:30 schrieb J. L. Trantham: Don't know if it would help much in your ultimate plan but the concept has been done before as the 53132-60011 and 53132-60016 Optional Time Base Boards for the 53132A counters. These boards will accommodate either an Isotemp OCXO33-46 (HP

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

Am 26.08.2015 um 22:04 schrieb Javier Herrero: I suppose that one of the alternatives that you've explored are the ABLNO from Abracon http://www.abracon.com/Precisiontiming/ABLNO.pdf looks just like this one from Crystek: http://www.digikey.de/product-search/de?keywords=cvhd-950 but that

Re: [time-nuts] KS-24361 EFC Error

Am 12.08.2015 um 19:13 schrieb Dave M: I have verified with MTI that the recommended tuning voltage for model 260-0624-C is 0 to 6V. The datasheet range of -10V to +10V is the available range of EFC for the entire 260 series, and may or may not apply to any specific model within the 260

Re: [time-nuts] KS-24361 REF-0 standalone

Am 09.08.2015 um 21:48 schrieb Pete Lancashire: 100% 2nd the thanks to all. OMG. 27 bytes of good technical content in a 19.7 KBytes message with 13 levels of citing. Please, everybody, snip the context that is no longer needed. regards, Gerhard

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

[I could not see this echoed by the server on the 1st try. ] Am 28.07.2015 um 03:58 schrieb Bill Byrom N5BB: [ nice and understandable summary of the Lee / Hajimiri ideas ] OTOH with this Dirac-style resonator feeding, one collects the noise sidebands from order 1 to MAXINT and one needs to

[time-nuts] Fwd: Re: Wikipedia and Residual Phase Noise

Weitergeleitete Nachricht Betreff:Re: [time-nuts] Wikipedia and Residual Phase Noise Datum: Tue, 28 Jul 2015 14:54:47 +0200 Von:Gerhard Hoffmann dk...@arcor.de Antwort an: g...@hoffmann-hochfrequenz.de An: time-nuts@febo.com Am 14.07.2015 um 02:32

Re: [time-nuts] Wikipedia and Residual Phase Noise

Am 14.07.2015 um 02:32 schrieb KA2WEU--- via time-nuts: Dear Magnus, With your kind permission I (totally ) disagree with you . We make 10 GHz oscillators which are almost getting close to the Poseidon Sapphire , but optical? the post power amplifier at 10 Ghz has a much higher noise floor

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