Re: [time-nuts] Unified VCXO Carrier Board

I would be pleased to contribute a 100 MHz wenzel onyx for testing if that'd be of value. I don't see myself getting to it anytime soon and this project directly benefits almost half the things on my "never to do but wish I could" list On Sun, Oct 25, 2015 at 7:00 PM Bruce Griffiths

Re: [time-nuts] When NTP goes wrong...

I would like to respond in a generic and sweeping way - having not read in the detail Bob layed out for us required to fully analyze the situation - to the notion that circuit level access or prior topological knowledge is required to exploit this or any other spoofing attack. On a corporation or

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

Depending on your actual power throughput needs- PTCs can be a challenge as Bob mentions. You will have a tough time meeting the power requirements of a Thunderbolt with many you'll see. Now efuses (think TPS24/25xxx) or mosfets with a controller (think LTC43xx) can be a good choice but don't

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

Those traco power units are fantastic. Absolutely great. For smaller applications Murata makes 3W ones quite similar and Wurth Electronik is also in that market. On Wed, Oct 14, 2015 at 12:00 PM Poul-Henning Kamp wrote: > > In message

[time-nuts] Two V(in)s walk into a bar...

Lets take a hypothetical device, like specifically a PRS10, but could be any time/freq device like a PLL or an amplifier or all of these. Isolating power supplies with some dexterity can greatly improve noise control, and less peformance related, can help us protect very very expensive circuits

Re: [time-nuts] Motorola Oncore UT+ firmware upgrade backup power questions

I didnt see this well answered - the device loads firmware at each start cycle. If i am not mistaken you can even use ntp. On Mon, Mar 16, 2015 at 1:34 AM, Adrian Godwin artgod...@gmail.com wrote: Seiko and some other manufacturers used Supercaps for a while in their Kinetic watches.

Re: [time-nuts] USB problems and solutions - Some what Off Topic -- USB-C

, Neil Schroeder gign...@gmail.com javascript:; wrote: USB-C will offer a number of things that I believe will be of benefit to time nuts everywhere: 1) High current 5V up to 3A on every port 2) High voltage/current up to 20V/5A optionally on every port - sufficient to power some

Re: [time-nuts] USB problems and solutions - Some what Off Topic

USB-C will offer a number of things that I believe will be of benefit to time nuts everywhere: 1) High current 5V up to 3A on every port 2) High voltage/current up to 20V/5A optionally on every port - sufficient to power some rubidium oscillators natively, and a small boost to get the rest of

Re: [time-nuts] IRIG-B audio decoder circuits and ICs sought

A bc635 can be had on eBay for almost nothing. It's not a pleasant piece of gear, but this is one task it can help you with greatly. Tools exist to let you analyse the stream extensively, and the Api is trivial to learn -but not super featured at the high level. On Tuesday, May 19, 2015, Tim

Re: [time-nuts] Comparing the BeagleBone Black Raspberry Pi as NTP servers

The other key key key item is make sure you hand build yourself a 3.14 or .16 kernel. NS On Mon, Mar 23, 2015 at 2:30 AM, Attila Kinali att...@kinali.ch wrote: On Sun, 22 Mar 2015 16:41:56 -0400 Paul tic-...@bodosom.net wrote: 1) Did you start out using the attached patch antenna? D Drown

Re: [time-nuts] Comparing the BeagleBone Black Raspberry Pi asNTP servers

I can confirm similar issues with each of my BBBs. They just can't seem to get the jitter down. I've tried a variety of combinations of Debian and Ubuntu, and even replaced the clock on one with an Si5338. On Sun, Mar 22, 2015 at 6:29 AM, Mike George mgeo...@tuffmail.us wrote: David: On

Re: [time-nuts] NTP stratum 1 appliances with different (GPS, etc) cores...

Ones ive deployed: End run. BSD Microsemi S350 LINUX Meinberg MRS LINUX Others: Spectra com Brandywine The three i used were all very good. You want more re details I will put some effort into it. ___ time-nuts mailing list -- time-nuts@febo.com To

Re: [time-nuts] Soekris without a GPS receiver.

You need to do a console mode install on the system itself or you have problems - you can do a debootstrap on another machine and get going... but heres the thing - you need FreeBSD to use the Soekris appropriately. Otherwise you're using a 486 from 2001 just to cause yourself pain. All you need

Re: [time-nuts] schematics of frequency counter

I would reconsider the LDOs while you have some time to play with them. The TPS79333DBVR is not even remotely ultralow noise at most offsets, despite what TI may say. For 5V5 and under up to about 600ma, I would suggest you take a look at the ADM7155 (adjustable) or ADM7154 (fixed). If you need

Re: [time-nuts] Set time on Solaris computer from HP 58503A

Of *course* you can sync to better than a millisecond on the LAN. There's not a machine worldwide at my employer more than 600 micros off from each other, and the machines at my house are within 50. You wanna start talking the sync-e+1588 test I'm doing? We're speaking in nanos then. My LTE

Re: [time-nuts] Set time on Solaris computer from HP 58503A

Based on my recent testing - including Solaris - you will be better off with the Internet unless your USB adapter is far better behaved than the several I have here On Sunday, December 14, 2014, Hal Murray hmur...@megapathdsl.net wrote: drkir...@kirkbymicrowave.co.uk javascript:; said: Can

Re: [time-nuts] Ublox time/freq aiding was Re: Linear voltage regulator hints...

The oscillator in he m8f is a vctcxo and can be steered with feedback or controlled by the host. Also the m8f can send compliant DAC words to a TLV8515 and and MCP part via i2c for external VCXOs. It accepts their return signal on what would normally be its feedback in ports. On Sunday,

Re: [time-nuts] Which First GPSDO to buy?

In a relative newcomer to this intense of a crowd :-). But j also found that I'm not quite instrumented (yet) to tackle the accuracy problem. As such Im focusing where i can on what I know (power, systems, the like) while I accumulate the other gear. As such I can say the thunderbolt and now

Re: [time-nuts] Beaglebone NTP server

Graham make sure you read up on dtb and fdt. Many if not most distros don't have what you might call a default. On Tuesday, December 9, 2014, Graham / KE9H ke9h.gra...@gmail.com wrote: Dan: Thanks. I don't know where you were quoting from, but it was the answer I needed. Paul: I found

Re: [time-nuts] 10MHz LTE-Lite - PPS accuracy?

I don't think so - should just work Did you already have ntpd running when you attached? And do you have the full PPS module stack including ldisc? It works on every platform I got. :-) As to better than Internet time - I cannot get it closer than 2 or 3 ms. I have MANY internet time sources

Re: [time-nuts] Beaglebone NTP server

It can be but suffers from enough jitter to be unusable. All current BBB out of the box kernels have PPS-gpio. Google PPS gpio DTS bbb. Enjoy :-) On Sunday, December 7, 2014, Chris Albertson albertson.ch...@gmail.com wrote: On Sun, Dec 7, 2014 at 12:09 PM, folkert folk...@vanheusden.com

Re: [time-nuts] Convert Stanford Research SR620 time-interval counter to SR625 ???

I certainly won't cry foul. There's places where rolling your own can put key assets at risk - it I had 4 I would push the issue but I only have one atomic reference and I'd rather not blow it up If anyone has things they need blown up I am available for the cost of beer. As electronics get more

Re: [time-nuts] Any tutorial available for Lady Heather displays?

It does not. Trust me. I learned what little I know about this time stuff on a res t then an SMTX and a thunderbolt - and found myself having to learn all the concepts elsewhere and even having to piece together how Trimble implements certain things by observation. Had i chosen the HP and Moto

Re: [time-nuts] 10 MHz oscillators vs 100 MHZ

Wenz will happily well you anything in stock. I just picked up my first original owner OCXO - a 100mhz onyx. On Wednesday, December 3, 2014, Azelio Boriani azelio.bori...@gmail.com wrote: I think that Ulrich should teach us how to make such an oscillator, not the other way round...

Re: [time-nuts] Convert Stanford Research SR620 time-interval counter to SR625 ???

Slightly deviated topic : I haven't really ever been able to talk to my prs10 via serial and change or check my PLL status/settings. Any tips here??checked the internal jumpers and resistors. On Thursday, November 27, 2014, Bob Camp kb...@n1k.org wrote: Hi On Nov 27, 2014, at 8:05 PM, Don

Re: [time-nuts] Convert Stanford Research SR620 time-interval counter to SR625 ???

bits on a serial interface when the oscillator obviously work. On Wednesday, December 3, 2014, yDavidkk I. Emery d...@dieconsulting.com wrote: On Wed, Dec 03, 2014 at 02:53:50PM -0500, Paul wrote: On Wed, Dec 3, 2014 at 12:08 PM, Neil Schroeder gign...@gmail.com javascript:; wrote: I

Re: [time-nuts] LTE Lite SkyTraq chip info

Poul are you teferring to the lte lite specifically? My Resolution SMT GG will go single sat or OD mode with only non GPS sats available. On Tuesday, November 25, 2014, Poul-Henning Kamp p...@phk.freebsd.dk wrote: In message 7da89.51b7dfcf.41a65...@aol.com javascript:;, S. Jackson

Re: [time-nuts] CentOS 7, Motorola GPS receiver and NTP

Check out the synergy m12 eval board. It's about $100 with the m12m on it and a little less if you're going to install your own. The most recent ftdi in-tree driver will automatically support the adapter. Previous versions you need to echo the VPI to the sys tree interface of the ftdi_sio

Re: [time-nuts] Low Additive Phase Noise 10 MHz Amps

My approach in progress is LVPECL driver from the master clock to a low cost clock cleaner PLL with a low phase noise VCXO (mine are crysteks and abracon depending on what I felt like at the moment). Does that sort of approach match your requirement? It isn't as low cost as a dist amp but the

Re: [time-nuts] ocxo

Did we answer the q? about schematics? All of SRS's products have their block diagram and parts list with a detailed circuit description in their user manual. Sneak preview: its all resistors. NS On Sun, Nov 23, 2014 at 4:22 PM, Don Latham d...@montana.com wrote: No question about that. The

Re: [time-nuts] ocxo

No but a little math based on your ocxo's range can help... but measuring it in person does give you the best numbers. More precision and more bits WON'T hurt here and the application notes from the leading crystal makers suggest a DAC front ended by a precision op amp with and that the xo be

Re: [time-nuts] rs-422 rs-232 to fast ethernet converter

If you feel like building : http://www.ti.com/tool/tida-00226 You can integrate that further than a cots one On Sunday, November 23, 2014, Joseph Gray jg...@zianet.com wrote: Didier has a good suggestion as to the serial to Wifi adapter. I may order one for my Z3801. Looking on Amazon, I

Re: [time-nuts] Lucent KS-24361 24V DC power requirements

I drive my prs10 with a parallel pair of ldos balanced by an op amp. I'll draw it out and post it if you like. On Friday, November 21, 2014, Azelio Boriani azelio.bori...@gmail.com wrote: At most you need 2.4A (when the two OCXOs are heating up): a 2.5A supply is needed. On Fri, Nov 21, 2014

[time-nuts] ADF4001/4002 startup questions

Morning nuts- I'm aware several of you use the ADF4002 for a simple small PLL in your radios. Could any of you share some example bits or maybe even the code you use during startup? I know what my latch values should be, but I don't seem to be getting them wrapped in the right control bits. I

Re: [time-nuts] ADF4001/4002 startup questions

the whole load process. If you are half as prone to error as I am, it will pay for it’s self pretty fast. Bob On Nov 19, 2014, at 12:35 PM, Neil Schroeder gign...@gmail.com javascript:; wrote: Morning nuts- I'm aware several of you use the ADF4002 for a simple small PLL in your radios

Re: [time-nuts] Si570 question

Jim- Do you need to tune it? The 571 is the VCXO - but if you're feeling adventuresome you could drive the 570 as an NCO (numerical) via its i2c interface. NS On Tuesday, November 18, 2014, Jim Lux jim...@earthlink.net wrote: On 11/18/14, 11:19 AM, Orin Eman wrote: I have one of these:

Re: [time-nuts] How to clock a Beaglebone Black from an external reference

Also, simon the plls can be entirely bypassed. The circuits aren't clearly exposed but I believe you could get the peripheral clock covered and definitely the Ethernet clock - interesting from a 1588 perspective. On Friday, November 14, 2014, Simon Marsh subscripti...@burble.com wrote: Most

Re: [time-nuts] How to clock a Beaglebone Black from an external referenceL

This is fantastic. If anyone is interested i would be happy to share my design for a couple of PLL/oscillator boards in cape form factor that would feed this perfectly. I've been waffling on my choice of microcontroller but in the spirit of this application I'll likely go with an msp430. On

Re: [time-nuts] SRS TSD12

Be cautious on these. Take a lesson from my idiocy; I read this email, said h atomic oscillator, and headed to eBay. Found a listing for a reasonable price, read through too quickly, and bought one... ...a non working one meant for parts. They're interspersed with the working ones and look

Re: [time-nuts] 10 MHz OCXO recommendations

Just to add a note on the original question : there are some brand new never used Vectron 8091s available for a reasonable price now and it's drift and jitter have been on par with my Wenzel. I am not yet set up to measure it's phase noise or other general rf characteristics but according to

Re: [time-nuts] future NTP programs...

I don't think ntp requires nor should have anything like a dedicated multi system monitoring platform of its own. The fact is that today's modern data collection methods are more than adequate - ntpd need only store its values in an accessible place and a graphite agent or ajna or your choice of

Re: [time-nuts] Divide by five

Go on - actually stepping or mixing then filtering the output? Or numerically deriving an offset? I am well on my way to en ensemble of sources - and my plan has always been to build a diverse set of circuits and attempt to capture the best of each. I just wasn't sure the best approach. At

Re: [time-nuts] Divide by five

I would very, very, very much enjoy perusing that library, if you'd be as kind ;-) Particularly just a few basics for the Xilinx. I also have a few CVHD-950s In need of some parenting! On Saturday, November 8, 2014, Gerhard Hoffmann dk...@arcor.de wrote: Am 08.11.2014 um 09:46 schrieb Said

Re: [time-nuts] Divide by five

On the topic of SMD/SMT surfboards - has anyone seen one that has pad areas designed for crystals or oscillators?Most of the pads are for resistors, and that might be fine for a crystal in the strictest sense - just the crystal no resonator - but I have 4, 6, and 8 pad guys here that just

Re: [time-nuts] Prototype boards. Was: Re: Divide by five

Sparkfun in the United States also sells off large bags of their discards for this very purpose - generally sorted by the type of work you wish to practice. http://www.sparkfun.com/. This is where I went wrong. I got a lot of great stuff and jumped right in on it. Fortunately we're not talking

[time-nuts] Trimble EOLs SMTx and SMT GG

A quick search revealed nobody has noted the Res SMTx and SMT GG have been announced as EOL by Trimble. The replacement parts are the anticipated Res SMT 360 and - no doubt in response to Mr. Jackson's LTE-Lite - the ICS-SMT 360, a complete GPSDO in an SMT format with and 10 and 40 MHz out as

Re: [time-nuts] HP5334 parport linux tool

VERY HELPFUL. I just picked up this counter and have done a lot of time just staring at that D shell connector with a slight tinge of despondence. NS On Sun, Nov 2, 2014 at 6:54 PM, Tom Wimmenhove tom.wimmenh...@gmail.com wrote: I just recently got myself a HP 5334B universal counter and

Re: [time-nuts] Really fast ADC needed

Agilent and Hitite make the only monsters that I am aware of being commercially available. I have heard tell of implementing time interleaved ADCs and magical wonderous but barely stable fpga ideas. Could ask around. hol...@hotmail.com wrote: A friend of mine is looking for an ADC that can

Re: [time-nuts] GPS for ntp

20, 2014 at 10:50 PM, Neil Schroeder gign...@gmail.com wrote: The one thing that hasn't yet happened is making the beaglebone timestamp on the linux side in a way that works for ntp. Custom code no problem. Freebsd PPSAPI no problem. Linux, nothing there yet. I have been working

Re: [time-nuts] GPS for ntp

The one thing that hasn't yet happened is making the beaglebone timestamp on the linux side in a way that works for ntp. Custom code no problem. Freebsd PPSAPI no problem. Linux, nothing there yet. I have been working on it but if anyone has some insight its appreciated. On Monday, October 20,

Re: [time-nuts] LTE-Lite module

How much would we guess that Wenzel blue-top would run you? Relative to the low cost GPSDO, my understanding is the Wenzel parts are priced appropriately to their quality. On Fri, Oct 17, 2014 at 11:32 AM, S. Jackson via time-nuts time-nuts@febo.com wrote: Hello Jim, let me answer

Re: [time-nuts] Price of LTE Lite GPSDO vs Trimble Thunderbolt.

How do you feel your module compares to that old Thunderbolt, Said? NS On Fri, Oct 17, 2014 at 1:13 PM, S. Jackson via time-nuts time-nuts@febo.com wrote: Pete, that is not inflation, that is supply and demand. The Trimble Mini-T was priced at $945 on Trimble's standard price list for 1

Re: [time-nuts] GPS jump

I'm trying to determine semantics and I was likely mistaken. They regularly update them both a variety of technologies - TWTCC and others. Then DC of course sends to COS. Is it actually possible to phase lock two oscillators together cross the distance from DC to Colorado Springs? (2400

Re: [time-nuts] GPS jump

No. They don't directly if that's what you mean. They do regular time transfers, likely more regularly than most due to accessibility to a common view and common interest. The GPS consolation is actually a sub-(sub?)-scale of UTC(USNO_MC) called i think USNO_OSC? Have to check. They have been

Re: [time-nuts] First few measurements of my Arduino Due GPSDO

at 11:47 AM, Neil Schroeder gign...@gmail.com javascript:; wrote: I have nothing constructive to add at this time but I would truly enjoy reviewing your design and build logs/notes. On Sunday, September 14, 2014, Andrew Rodland and...@cleverdomain.org javascript:; wrote

Re: [time-nuts] First few measurements of my Arduino Due GPSDO

I have nothing constructive to add at this time but I would truly enjoy reviewing your design and build logs/notes. On Sunday, September 14, 2014, Andrew Rodland and...@cleverdomain.org wrote: Hi all, I've got some figures in from my clock, and I figured I would post them here in hopes of