Re: [time-nuts] TNS-BUF update

Am 19.08.2018 um 10:22 schrieb Bruce Griffiths: Rick I devised the bias circuit for the TNS-BUF. It exploits the fact that for a RED LED at least the difference between the LED forward voltage and the transistor Vbe is ~ 1V and has a fairly low tempco and has low noise (at least for RED

Re: [time-nuts] TNS-BUF update

Am 19.08.2018 um 14:43 schrieb Bruce Griffiths: Yes, I looked at the plots and I see exactly what I described. 2nV/rtHz at frequencies somewhat above the reference current source output RC filter, rising to a high value at frequencies below the current source output filter pole. This is an

Re: [time-nuts] Naked 4046 PLL chip

Could it be that the reflector drops messages? I did not get Ulrich's  NO-Message and also not that from msimon6808. It has become quite silent since the move to the new server. Subjectively -6 dB. Cheers, Gerhard Am 23.07.2018 um 02:32 schrieb Ulrich Rohde via time-nuts: That is a

Re: [time-nuts] Effects of Simple GPS jamming on GPSDO's ?

Am 31.08.2018 um 19:39 schrieb jimlux: On 8/31/18 10:15 AM, Bob kb8tq wrote: Hi Having spent a lot of my life designing GPSDO’s it’s a “that depends” sort of thing. For a simple noise jammer, yes, they pretty much all will go into holdover. When the jammer goes away, they come out of

Re: [time-nuts] NIST

Am 31.08.2018 um 20:17 schrieb Hal Murray: att...@kinali.ch said: I have somewhere a paper (which i cannot find currently, sorry) that used a dish trained at one of the EGNOS satellites and used it as the only source for timing. IIRC the results were promising, but not spectacular. The

Re: [time-nuts] WWV and legal issues

Am 01.09.2018 um 20:40 schrieb Magnus Danielson: One should first know that there is a lot of papers now on frequency transfer over fiber. The stability achieved on the best ones so far greatly below that of the optical clocks that they want to compare. Please, in a nutshell: what are the

Re: [time-nuts] RF Isolation Amplifier ...

Am 14.10.2018 um 22:14 schrieb Richard (Rick) Karlquist: On 10/14/2018 11:20 AM, Dr. Ulrich L. Rohde via time-nuts wrote: Actually the BFT is out of production since quite a while there are more stable and higher Ft devices on the market. 73 de N1UL How is a higher Ft device more stable? 

Re: [time-nuts] RF Isolation Amplifier ...

Am 14.10.2018 um 18:47 schrieb Dana Whitlow: Corby, Now that I learn that the BFT66 is a "wild one", I'd remark that stability is indeed the likely issue. I was puzzled by the presence of that capacitor in the first place, as this circuit is clearly neither tuned nor of especially high

Re: [time-nuts] HP 58503B PSU replacement

Am 14.11.18 um 18:41 schrieb Dr. David Kirkby: On Thu, 8 Nov 2018 at 21:43, Dr. David Kirkby < drkir...@kirkbymicrowave.co.uk> wrote: On Thu, 8 Nov 2018, 14:53 George Atkinson via time-nuts < time-nuts@lists.febo.com wrote: Last month I was at the UK “National” hamfest and in the flea market

Re: [time-nuts] 10 MHz -> 16 MHz

Am 01.10.2018 um 03:01 schrieb Arthur Dent: Oops, I meant divide by 5 to get 2 followed by 8x NB3N511 work? ___ That should work, also for the 12 MHz case with 6x instead of 8x. But it still needs a second divider chip like the solution I built

Re: [time-nuts] 10 MHz -> 16 MHz

Am 30.09.2018 um 15:44 schrieb Pete Lancashire: Same question 10 to 12:-) Same Answer. Select pins = (1, 1, 0) for 12 instead of (1, 1, 1) for 16. \Gerhard ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to

Re: [time-nuts] 10 MHz -> 16 MHz

Am 30.09.2018 um 06:15 schrieb Hal Murray: What's a clever, simple, reliable (pick 2 of 3) way to get 16 MHz out of 10 MHz? Low phase noise isn't a big requirement and jitter doesn't need to be sub-nanosecond. The main requirement is perfect cycle count accuracy. This is for driving a 16 MHz

Re: [time-nuts] 10 MHz -> 16 MHz

Ingrid clicked through the "you might find that useful too" - list and stumbled across this: < https://www.digikey.de/product-detail/de/adafruit-industries-llc/2045/1528-1206-ND/5353666    > \Gerhard ___ time-nuts mailing list --

Re: [time-nuts] new op amp for distribution amplifiers

Am 17.12.18 um 16:22 schrieb Anders Wallin: Stylish dead-bug! ;) On my board I increased Rf/Rg to 4k7, to get rid of the gain-peaking. With 4k7 resistors I see +20 dBc/Hz worse phase-noise with the THS3491 compared to LMH6702 :( (image attached) If noise power scales with the resistors then it

Re: [time-nuts] Modern signal generators

Am 11.12.18 um 20:30 schrieb jimlux: On 12/11/18 10:23 AM, Richard (Rick) Karlquist wrote: On 12/11/2018 9:13 AM, djl wrote: Rick: I've spent some time with the dds blocks. We found them to generate lots of low level spurs, making lots of "birdies" when used as local oscillators in

Re: [time-nuts] Minicircuits SYPD-1

Hi, matching in the sense of selecting 4 equal ones won't help much with BJTs. Take them from the same tape, that's enough. Also, the transformer ratio does not matter much. Once VBE = 0.7V, the transistors switch on. The authors write that thy use the BE junction as diodes, but that is not

[time-nuts] new op amp for distribution amplifiers

Have you seen the new THS3491 ? LMH6702 on steroids. This one begs to be designed into new distribution amplifiers: Everything from DC / 1pps to a few 100 MHz into 50 Ohms, without any changes. (the usual gain = 2,    50R/50R out design) rise / fall 1.3 ns for 10V step slew rate 8V / ns

Re: [time-nuts] Misuse of word "decimate" (was Re: Short term 10MHz source)

Am 10.01.19 um 17:33 schrieb Bob Martin: Back in those same seventies, I was working for an army lab (Harry Diamond Labs) as a summer student. I saw a picture in a lab supply catalog of a (ein) stein of beer. I tore it out and taped it over a picture off Albert Einstein that a German

Re: [time-nuts] Programmable clock for BFO use....noise

Am 16.09.2018 um 23:11 schrieb Attila Kinali: On Sun, 16 Sep 2018 22:08:19 +0200 Gerhard Hoffmann wrote: I'm also not a fan of using slowish, slew-rate challenged  logic as a replacement for a low pass. When I want a low pass, I make it from nice, time-invariant RLC. Unfortunately, using

Re: [time-nuts] Programmable clock for BFO use....noise

Am 16.09.2018 um 20:00 schrub Mark Goldberg: For a radio BFO you want something with low phase noise (low jitter). The SI5351 is not designed for that, and it's jitter spec is 70 ps, which is pretty noisy. It even has a spread spectrum mode that would be even worse. They do have other parts

Re: [time-nuts] Programmable clock for BFO use....noise

Am 15.09.2018 um 17:38 schrieb Richard (Rick) Karlquist: If you divide by something that is not a power of 2, then it is important that each stage produces an output waveform with a 50% duty cycle. Otherwise flicker noise which has been up-mixed by a previous stage, will be down-mixed into

Re: [time-nuts] HP Stories: An architectural view of the HP 5060/5061 and awkward oscillator adjustments.

Am 24.02.19 um 14:39 schrieb Richard (Rick) Karlquist: yet they got a pass and became SOP.  The R lab manager at Santa Clara Division famously said "no customer chooses HP products because they have great power supplies." G..  My HP16500C has a defective PS and my 4274A RLC bridge

Re: [time-nuts] injection locking crystal oscillator

Am 02.03.19 um 17:02 schrieb jimlux: Also, since injection locking is a case of coupled oscillators.. you might be interested in this (freely downloadable): Ulrich has a discussion of n promiscously coupled oscillators in [1]. In real life probably a debugging nightmare. I'd like to

[time-nuts] Lady Heather treats me badly.

Hi, yesterday I did install LH on my Linux system: got the zip file, unpacked it, compiled LH and after the usual ado I was able to connect to my Lucent KS-24361 pair. But somehow it looks like she's slowly dying: first the azimuth/strength display disappears; later the clock , the info

Re: [time-nuts] Distribution amplifier for 10MHz and 1 pps

Yes :-) another one of mine: <    http://www.hoffmann-hochfrequenz.de/downloads/iso_amp.pdf     > It is based on a NIST design and made from discrete transistors. Unfortunately it also needs RF PNP transistors that are slowly going the way of the Dodo. Luckily, I still have a reel of BFG31.

Re: [time-nuts] Power supply for OCXO using "USB power blocks"

Am 10.03.19 um 15:54 schrieb jimlux: True.. but there are a plethora of the USB 5V power blocks around - in general, there are lots of USB 5V (noisy, I'm sure), e.g. Cars now have 5V USB jacks, so I was thinking about designing with that in mind. The question is really more one of "how much

Re: [time-nuts] Power supply for OCXO using "USB power blocks"

Am 10.03.19 um 01:38 schrieb jimlux: Has anyone tried a +5V to +15V DC/DC to run an OCXO, getting the 5V from one of those rechargeable USB power bricks.  I was thinking about portable operation. In my case, the OCXO is something like a Wenzel streamline. I would think that the DC/DC

Re: [time-nuts] inexpensive fiber optic distribution

Am 21.03.19 um 07:27 schrieb Hal Murray: jim...@earthlink.net said: It seems like you could probably figure out how to interface to these things and use them to distribute timing signals. The document is the "SFP MSA".  I still have the XFP version somewhere here. I don't know how well

Re: [time-nuts] Lucent RFTGm-II-XO / Lucent RFTGm-II-Rb / NT BW50AA

Am 12.02.19 um 03:57 schrieb Jeff Blaine: I have these 3 systems operational here and wonder what is the "best" of the sources? The local use for the reference is as a time base for test equipment.  Nothing hyper critical in the way of end-use requirements - but after running the NT GPSDO

Re: [time-nuts] AD9912 DDS frequency resolution measurement (and OT LTC6957)

Am 19.02.19 um 12:29 schrieb Bo Hansen: Hi I have experience with the AD9912 in this H/W and S/W implementation: But I must admit that I personally haven't measured the minimum frequency step size. Poul-Henning Kamp, among others, is using one of the

Re: [time-nuts] GPS 1PPS, phase lock vs frequency lock, design

Am 25.05.19 um 02:51 schrieb life speed via time-nuts: Hi all, it's been a while since I visited.  I am venturing into an unfamiliar area from my usual low phase noise PLL, OCXO and microwave synthesizer design endeavors. I recall there are some knowledgeable, well, time nuts on this list and

Re: [time-nuts] Excellent equipment rack + time nuts at HamRadio 2019 ??

Am 11.06.19 um 13:36 schrieb John Ackermann. N8UR: Star Case (https:www.starcase.com) is  U.S. company (in Indiana)  that sells similar open-frame rack kits for very reasonable prices.  I have several and have been very pleased.  They are available whatever height you want, with depths of 20

Re: [time-nuts] Aerial coax downlead placement

Am 04.07.19 um 22:43 schrieb Peter Vince: Hello all, A new contact, whose background is in computer programming rather than RF, is getting into accurate GPS positioning, and has been tapping me for any knowledge I might have. I persuaded him to get the new Ublox F9P receiver and also a

Re: [time-nuts] Aerial coax downlead placement

Am 05.07.19 um 23:26 schrieb Poul-Henning Kamp: In message <28f942e8-b61d-4fa5-929d-923184828...@n1k.org>, Bob kb8tq writes: Energy flow is indeed inside the cable if things are set up and operating correctly. Please note in this context that *nothing* about lightning strikes works

Re: [time-nuts] 60 Hz frequency and phase measurement

Am 03.07.19 um 01:25 schrieb Tim Shoppa: Jim, most of us are satisfied to use a 6.3VAC filament transformer to step down from 120VAC and isolate from the power line. Exactly. I used an old 6 or 9V AC wall wart and a resistive 1:3 divider last year when the European grid frequency was low

Re: [time-nuts] Building a DMTD/phase noise set in the 21st century

Am 24.08.19 um 23:49 schrieb Jan-Derk Bakker: there may be some flicker noise present, I've not personally seen the poor DC performance in many S/D audio converters either (apart as artefacts from the front-end electrolytic coupling capacitors). Yes, these electrolytic capacitors can produce

Re: [time-nuts] Building a DMTD/phase noise set in the 21st century

Am 25.08.19 um 10:52 schrieb Hal Murray: att...@kinali.ch said: As you have always two channels, I would recommend to use two mixers fed with an LO that is 90°C out of phase to get I and Q components. How does that compare with running a single channel twice as fast? At low enough

Re: [time-nuts] Building a DMTD/phase noise set in the 21st century

Am 26.08.19 um 04:47 schrieb Bruce Griffiths: I've only used an ultra low esr 33F supercap made in Korea in the source circuit of the input JFET on a preamp. Down to 10Hz at least it didn't appear to add significant noise to the 4nV/rtHz @10Hz preamp. I had bought some at DK, but 30 Ohms

Re: [time-nuts] Hp10811 parts ref

Am 11.09.19 um 08:33 schrieb Club Internet: Luciano, References of the manual is the following: MANUAL PART NUMBER 10811-90002 Microfiche Part Number 10811-90003 Dated August 1980. Thanks very much for your reply (indeed npn and Q6...!) Looking for a replacement for UA208 (obsolete) hard to

Re: [time-nuts] HP5370A vs B version

Am 20.07.19 um 10:21 schrieb Frank Stellmach: the B version has a 500MHz front end, copied from the HP5345A, with a matched pair of amplifier / Schmitt trigger hybrids. The A version has separate amplifier and Schmitt trigger ICs. There were also changes on the trigger circuit. Then the B

[time-nuts] FEI 405B oscillators

Hi, I have one of these FEI405 oscillators from this list auction 4 years ago. While it dives nicely down deep into E-13 land over some seconds, it only delivers -2.5 dBm output power and has a lot of phase noise and spurs far out. That does not look healthy. Is there a real data sheet out

Re: [time-nuts] Using the LT3042

Am 10.07.19 um 11:27 schrieb Bruce Griffiths: Like virtually all low dropout regulator ICs the LT3042 is quite noisy at frequencies below its reference low pass filter high frequency cutoff. Some zener based references are considerably quieter in this region. We had that already last year.

Re: [time-nuts] Difference in antennas

Am 22.11.19 um 23:29 schrieb Hal Murray: j...@febo.com said: I like the idea of inserting attenuation until the SNR or Cn values start to go down. That may be the most practical solution. Inserting attenuation is a good trick for the tool box. It is also used to measure error rates on fiber

Re: [time-nuts] 100 MHz decade Divider II

Am 01.12.19 um 23:40 schrieb Bob via time-nuts: From Gerhard's and other list comments I'd never choose Morion oscillators. I did not want to belittle Morion. In fact, their current crop is top notch. But an oscillator that has spent 20 years on a cell phone tower and that has cooked it's

Re: [time-nuts] Phase Detectors/Mixers for DMTD and PN measurements

Am 12.12.19 um 07:19 schrieb Bruce Griffiths: Cross Correlation methods are commonly used with analog mixers. Most of the high end commercial offerings use it (Holzworth, Anapico, Rhohde & Schwarz, etc.) "High End"  is a contradiction to "Commonly Used" somehow. In the published timenuts

Re: [time-nuts] Phase Detectors/Mixers for DMTD and PN measurements

It seems the mixer noise cannot be ignored. I wonder then  why nobody  takes the mixer to cross correlation land, and maybe even the driver amplifier. The FFT analyzer can do it anyway, a second AF pre amp costs nothing,  and other than that there are only another mixer and 2 power

Re: [time-nuts] Using commercial video amplifier for 10MHz clock distribution.

Am 19.10.19 um 10:30 schrieb Bryan _: There is a schematic here on the Extron uploaded by a TN member. The schematic for the Extron looks looks dead simple that one could really just make a simple 3 channel with the included mods in the writeup, only problem is I don't see a source for a

Re: [time-nuts] A simple sampling DMTD

Am 29.11.19 um 11:45 schrieb Jan-Derk Bakker: In general: as much as I like having it in my toolbox, I don't see how using an FFT would be the best tool for the job in a zero-crossing detector for a DMTD, let alone this particular sampling DMTD. For one, this 8-bit processor doesn't have the

Re: [time-nuts] 100 MHz decade divider advice needed

Am 30.11.19 um 02:10 schrieb Gerhard Hoffmann: Auto-follow-up: Why do you want crystal ovens in each stage when you  lock it to something else anyway? Then something cheaper like these should do: < https://www.digikey.de/product-detail/de/crystek-corporation/CVHD-950-100.000/744-1213

Re: [time-nuts] 100 MHz decade divider advice needed

Am 30.11.19 um 00:50 schrieb Perry Sandeen via time-nuts: Yo Bubba Dudes!, I'm considering attempting  making a 10 MHz frequency difference meter sort of based on the Ticor 527. The design calls for using 100 MHz OCXO's and using the PLL difference to steer the EFC and then mix it with a PLL

Re: [time-nuts] Are there SC-crystals out there in the wild that are not Overtone?

uftrag von Gerhard Hoffmann via time-nuts Gesendet: Mittwoch, 26. Februar 2020 01:42 To get a first impression, I soldered the crystal to an SMA plug and put it on an R ZVB-8 network analyzer and measured S11. I could see the 5 MHz resonance as a 15 dB dip.  There was also a resonance a

Re: [time-nuts] Are there SC-crystals out there in the wild that are not Overtone?

Am 28.02.20 um 11:34 schrieb Attila Kinali: Yes, but how many of us can build a time-nuts quality oscillator? I'm still lacking that paper/book that teaches me how to build a high stability oscillator. Especially if you see THIS in a tutorial and 5 cm below the OOOH so precise phase noise

Re: [time-nuts] Are there SC-crystals out there in the wild that are not Overtone?

Am 26.02.20 um 15:22 schrieb Attila Kinali via time-nuts: Do you know what the two coils/transformers that were glued to the outside of the inner oven were for? I guess they are part of the 5 -> 10 MHz doubler Bernd Neubig has written a few documents on how to measure crystals properly,

Re: [time-nuts] was: Odd-order multi Now: fft analyzer woes

Yes, that spill-over to neighbor bins is a known thing; when I wrote software for mixed signal wafer testers we sometimes used no windows at all and instead made sure that all frequencies involved were proper submultiples of the sample rate. In my current situation I'm limited to what the

Re: [time-nuts] Symmetricom 023-63008-07 5MHz Crystal Oscillators

Am 23.01.20 um 19:12 schrieb Bob kb8tq: Hi If you do try it, double balanced mixers seem like the way to go. Two 5’s into one mixer gives you 10, a low level spur at 5 and some crud at DC. Duplicate that with another mixer and you have a second 10. Maybe go into a low Q filter to clean it up

Re: [time-nuts] was: Odd-order multi Now: fft analyzer woes

Hi, Abdul! Am 21.01.20 um 19:10 schrieb Prologix: Prologix controllers pass data as is from the instrument to PC. It does not add any termination characters. But then there is the ++eot command just to set up this. ++eos command controls how termination is handled for data going the other

Re: [time-nuts] Low Phase Noise Amplifiers

Am 11.01.20 um 15:36 schrieb Charles Clark: I wonder if adding active bias feedback around the RF transistor to reduce the low frequency current variations would help.  This is the classic PNP bias scheme which can be applied to BJT's or FET's.  I have used it to successfully improve the

Re: [time-nuts] Norton amplifiers

Am 13.01.20 um 19:29 schrieb Alexander Pummer: there was one "zwischen basis-Schaltung" which has good noise properties basically the basis and the emitter of a bipolar transistor is connected to the two ends of a transformer's secondary winding ,a a tap on said winding is grounded Ulrich

Re: [time-nuts] Horowitz & Hill - "The X Chapters" - shipping now

The extra material that did not make it into The Art Of Electronics 3rd ed. because that book weighs already 2.3 Kg. It filleth the community with bliss and is the current bestseller, just 3 days available. <

Re: [time-nuts] Odd-order multiplication of CMOS-output OCXO

Link does not work, but https://www.digikey.de/product-detail/de/ecs-inc/ECOC-2522-100.000-3FC/XC2265-ND/6578492 Sorry, Gerhard ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to

Re: [time-nuts] Odd-order multiplication of CMOS-output OCXO

Am 20.01.20 um 22:57 schrieb Attila Kinali: On Mon, 20 Jan 2020 12:50:09 -0800 Mark Haun wrote: True enough, but remember that my motivation for using the OCXO in the first place was to combine the required phase-noise spec with OCXO-class frequency stability (this is for narrowband coherent

Re: [time-nuts] low phase noise, noise floor and noise figure amplifier at 400MHz

Am 10.01.20 um 03:01 schrieb jimlux: On 1/9/20 5:38 PM, Lifespeed wrote: Hi Time Nuts, I have a need for a low phase noise, noise floor and noise figure amplifier at 400MHz.  I have tried some off-the-shelf 50 ohm amplifiers, the best of which degrades phase noise by a couple dB.  I'm

[time-nuts] Now is the time for all good dogs

to jump over the lazy fox. Oh, not really. But if you always wanted to experiment with harmonic balance, nonlinear noise and other things that your LTspice cannot do, then Keysight currently offers 3 month trial licenses for ADS for home office use for free. <

Re: [time-nuts] Now is the time for all good dogs

Am 07.04.20 um 19:27 schrieb Brent: Saw this the other day regarding training but it looks like its only the Pathway stuff. I don't see anything for ADS... It seems they have renamed it. <

Re: [time-nuts] Phase measurement of my GPSDO

Am 03.04.20 um 23:08 schrieb Bruce Griffiths: One can merely add diodes to the opamp feedback network form a feedback limiter and maintain the opamp outputs within the range for which the opamp is well behaved whilst maintaining the increase in slew rate for the output. Has anybody here 

Re: [time-nuts] power supplies

I love my R NGT20, I have several of them. Reasonably clean, analog, uA741 technology, no switcher, knobs for everything. 3 independent, unconnected outputs: 2* 0-20V@1A for op amps etc 1*0-6V@5A for the digital stuff for example: <

Re: [time-nuts] GPS antenna splitter recommendation?

Am 30.04.20 um 03:01 schrieb Bob kb8tq: Here’s a few: ... lots of ebay offers snipped The problem is, they will do their Job at RF, but the GPS receiver usually has to feed the antenna pre-amplifier with DC through the cable. The 4 RX candidates should not have to fight for the right / duty

Re: [time-nuts] Bourns for fine frequency tuning

Am 12.05.20 um 11:03 schrieb tim...@timeok.it: Bourns 3700S-196-1004 A short search leads to < https://www.mouser.de/ProductDetail/Bourns/3700S-1-103?qs=Ce8Nk3DxA0Ci0Gcap53qHg==     > which says that that the base type is EOL-ed (end of product life). The data sheet has no 100K

Re: [time-nuts] f-multipliers from VHF to 10 GHz

No, no, no, it's not that bad :-)  I should not post here in the middle of the night. Sorry to cause that confusion. Minimum  is -90 dBc @ 50 Hz, or let's say @100 Hz @ 10 GHz. that would equal -110 dBc@1 GHz,   or -130 dBc @100 MHz, BTDT. And then, the ~4 MHz difference between TX and RX

[time-nuts] f-multipliers from VHF to 10 GHz

I have a potential project in the electron spin spectroscopy sector and I need one or two clean signal sources in the 10 GHz range. Phase noise at, say, 50 Hz offset is important, but anything below 110 dBc  does not care. That probably calls for a multiplied crystal. These Hittite PLLs from AD

Re: [time-nuts] OCXO Support Board

Am 15.05.20 um 01:25 schrieb John Ackermann N8UR: On 5/14/20 5:07 PM, Bob kb8tq wrote: No, the cheap board houses don’t check for this stuff. They just build and send it back. If there’s a gotcha, you get it on the board. I was pleasantly surprised last week when Seeed Fusion contacted me

Re: [time-nuts] OCXO Support Board

Bill E. On Tue, May 12, 2020, 11:59 PM Matthias Welwarsky wrote: On Dienstag, 12. Mai 2020 20:53:25 CEST Gerhard Hoffmann wrote: Ten boards did cost $5 at PCBway, DHL wanted $25 for transport. :-< I can publish the Altium Designer project or the Gerber files when the 1st ten are used up and there

Re: [time-nuts] Noise Floor

Am 24.03.20 um 20:06 schrieb Attila Kinali: If you want an SDR like system to play with, try the Red Pitaya? You get 2 ADC channels 125MHz/14Bit or 128.x MHz/16 Bit, 2 DAC channels, 2 ARM CPUs, Network etc and it boots Linux when you plug in an USB power supply. It has existing apps such as

Re: [time-nuts] book could be interesting 4 you

OOOhps, that was not intended for here. :-) Looks like Thunderbird has messed up the address data base. But at least it's on-topic. Gerhard ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to

[time-nuts] book could be interesting 4 you

< https://epdf.pub/discrete-oscillator-design-linear-nonlinear-transient-and-noise-domains.html > And there is more! cheers, Gerhard ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to

Re: [time-nuts] 1pps signal measurement

Am 29.06.20 um 20:48 schrieb Gerhard Hoffmann: eternity, with CMOS being so slow that interoperability with CMOS was not an advantage. ooohps, sorry:    substitute / interoperability with CMOS / interoperability with TTL / ___ time-nuts mailing

Re: [time-nuts] low power divide by 5

Am 29.06.20 um 18:43 schrieb jimlux: What logic family might be appropriate for a divide by 5 from 50 to 10MHz, low power, running off 3.3 or 5V? In the picture is probably what you need, and maybe more. The left third is a comparator that generates valid CMOS levels from a vaguely defined

Re: [time-nuts] low power divide by 5

Am 02.07.20 um 00:35 schrieb jimlux: On 7/1/20 1:41 PM, ed breya wrote: Yeah, I know. I was just lamenting the lack of nice medium-density count functions in 74AC. It's hard to beat the simplicity of a '390 when you 16 bore holes just to deploy 4 flip flops is not what I'd call

Re: [time-nuts] low power divide by 5

Am 01.07.20 um 03:04 schrieb Hal Murray: What logic family might be appropriate for a divide by 5 from 50 to 10MHz, low power, running off 3.3 or 5V? How important is the "low" power? Do you have other logic/CPU around? Do you need 50/50 duty cycle (or close) or is 20/80 OK? How about a CPU

Re: [time-nuts] Frequency division by 81

Why don't you simply divide by 81 with a normal CMOS divider and synchronize its output with a 7474-like flipflop to the original clock? The phase noise would be determined only by this last flipflop. regards, Gerhard Am 18.06.20 um 13:58 schrieb Gilles Clement: Hi I need to divide the

Re: [time-nuts] Vibration isolation of quartz oscillators

Am 27.06.20 um 14:02 schrieb Michael Wouters: What do other people do with their quartzes ? I thought I should ask for some advice before attempting measurements. A sand box? Literally? Some bags filled with sand really helped with my turntable. Make sure that it stays in the bags.

Re: [time-nuts] 1pps signal measurement

Am 29.06.20 um 19:35 schrieb Mark Spencer: I am also wondering a bit about the possible impact of my 5370B's having a maximum trigger setting of approx 2.18 volts vis a vis the typical specs for 5 volt TTL signals that typically define a logic 1 as having a slightly higher voltage ? Would

Re: [time-nuts] Frequency division by 81

Am 19.06.20 um 11:42 schrieb Clint Jay: 12F675 is specified for clock input of 20MHz and (without digging too deep into the way the code works) I think the PICDiv code works with clock input rather than input to a timer or counter peripheral so 20MHz would be fine. While I'd not recommend it

Re: [time-nuts] Voyager space probe question

Am 30.11.20 um 07:00 schrieb Mark Sims: I once bought a spool of tungsten-rhenium alloy wire on ebay for dirt cheap. A few weeks later a guy contacted me and offered a lot of money for it. Turns out they used it to rebuild TWTs. 1. I used to live in Ulm, Germany, where there was? Thales TWT

Re: [time-nuts] SMPS or conventional?

Am 22.12.20 um 00:43 schrieb Hal Murray: [Old mail, context is TECs] bruce.griffi...@xtra.co.nz said: If the drive current ripple is too high fatigue failure from cyclic thermomechanical stress can be significant. Do good data sheets say anything about that? Is there a frequency term in

Re: [time-nuts] Flicker Noise Reduction

There is a paper from the univ of Twente in NL that seems to indicate that it takes some time in an open FET until the traps in the channel build up, so switching the FET off in a regular way might be an advantage. I stumbled across it when I was seeking input for my ultra-low-noise chopper

Re: [time-nuts] 5065A Rb Cavity RX - Varactor repair?

to put this chip in perspective. Rick N6RK On 10/22/2020 12:12 PM, Gerhard Hoffmann wrote: This is a ADF5356 with 2 LT3042 to clean up the supply voltage. I measured the successor to this board yesterday on 10 GHz out with my new 1/8 prescaler and the SR620 counter and some As long as you can

Re: [time-nuts] Daft idea with the National Grid

Am 08.02.21 um 00:11 schrieb Philip Gladstone: As an amateur radio guy, I can't help wondering whether I could use this as a *very* low bit rate channel across the country. I have done navigation _for_ tv and phone sats, and the spread navigation signals are just 20 dB under the MPEG data

Re: [time-nuts] AM/PM conversion on mixer, DMTD

Am 10.02.21 um 16:19 schrieb Lux, Jim: There are people making triple balanced mixers. L3Harris Miteq makes them https://www.markimicrowave.com/home/ was started by Ferenc Marki, who developed triple balanced mixers at WJ Synergy Microwave claims to make triple balanced mixers: <  

[time-nuts] Re: Best frequency to start for GHz synth ?

OOps, the 400 MHz filter is < https://www.digikey.de/product-detail/de/qualcomm-rf360-a-qualcomm-tdk-joint-venture/B39401B3742H110/495-3923-1-ND/1858979 > Gerhard ___ time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an

[time-nuts] Re: Win 10 stuff

Am 15.04.21 um 10:12 schrieb Rex: Thanks for that info (below) about Win 10 turning off auto updates. I think I got gpedit installed on my Win 10 Home and have made these changes. Nice. Does anyone know if there is a way to get Win 10 to stop nagging me about creating/fixing a Microsoft

Re: [time-nuts] AN/URQ-13 FE-15a oscillator question

Hi, all of y'all, would you please snip the cited parts that are long out of context?!!one!eleven!! I wonder how that reads on a cell phone. cheers, Gerhard ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to

[time-nuts] Re: Testing a GPS mag mount antenna

Am 20.08.21 um 22:14 schrieb skipp isaham via time-nuts: Hello to the Group, I picked a box of used (removed from commercial radio APRS type service) mobile/vehicle GPS Antennas. They are mostly the classic square molded, black plastic magnetic mount type, about the size of a bar of soap

[time-nuts] Re: Affordable 160 GHz Sampler

Am 01.09.21 um 19:42 schrieb Mike Monett: Conventional samplers for home brewers usually go to 1 GHz. The SD-32 sampler for the Tektronix 11801C mainframe goes to 50 GHz. The HP 110GHz oscilloscope costs around $1.3 Million USD, with a 10-bit resolution. Very impressive. I have a HP54750

[time-nuts] Re: HP Z3801A - Dead GPS Receiver - Oncore VP

Am 08.10.21 um 15:26 schrieb CFO: My Z3810 had begun to show Alarm on the GPS receiver. On Coldstart it seems like it lives for 10min or so , and the enters alarm state. I'm quite sure it's the GPS receiver that has gone to "heaven" , never got that "Coldstart" every 6 months incorporated in

[time-nuts] Re: Death of a Capacitor

Am 27.09.21 um 00:34 schrieb Bob kb8tq: Hi If you start dumping major current spikes into a common ground, it’s amazingly difficult to get rid of the results. First Principles know the law of the conservation of spikes: Capacitors convert voltage spikes to current spikes. Inductors

[time-nuts] Re: Death of a Capacitor

Am 27.09.21 um 10:16 schrieb n...@lazygranch.com: I've only designed one LDO as a discrete chip (as opposed to a portion of a chip where performance just has to be good enough), so I have no guru status. That said, what spikes pass through a LDO if you do it right is simply a capacitor

[time-nuts] Re: NTP servers

Am 23.11.21 um 11:53 schrieb Avamander: Speaking of Raspberry Pi's as time servers, does anyone here know of a nice single board computer that supports both Ethernet hardware timestamping and GPIO PPS input? It seems the BeagleBoneBlack fits the bill. I like it because it runs a normal

[time-nuts] Re: Potting compound advice needed

A customer of mine uses Solitane, another one Mupsil. I just wrote down the names in case I might need it. Probably more for coating boards in space apps, no idea if it fits. Am 10.11.21 um 23:40 schrieb Richard (Rick) Karlquist: I am looking for help choosing a potting compound that has the

[time-nuts] Re: 1 pps

Am 10.11.21 um 23:56 schrieb B Riches via time-nuts: Any ideas on how to get a useable 1 pps output sig out of a Lucent KS-24361 to use with SL sampling rate detector. I am using the 1 pps output from a Jackson unit but would like to use the Lucent if I can since that is my gps standard. 73

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