[time-nuts] HP DVM for shipping

List, the item has been spoken for. Regards, Perrier ___ 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] Wavecrest DTS2075

On 2018-04-10 8:56 PM, Gerhard Hoffmann wrote: 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 I have the

Re: [time-nuts] TCVCXO Adjustment

If it's just to set for the initial setup or aging, just do it the old-fashioned way, with a trimmer pot to run the Vt - simple, easy to program, and it remembers the setting. Ed ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

[time-nuts] suggestions on getting 24 Mhz ?

Needed for SDR project as external clock source. -pete ___ 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] TCVCXO Adjustment

wayne.hol...@gmail.com said: > Since the TCVCXO includes a voltage control input, my plan is to also add a > 12-Bit Digital-to-Analog Converter ... What's the temperature stability of the D/A? How does that compare with a 10 turn pot? I remember a comment about pots aging. It was somewhat

Re: [time-nuts] Cheap jitter measurements

g...@rellim.com said: > It tests the time to do two back to back clock_gettime(). That's the time it takes to read the clock. That's not what I mean by granularity but I think I see how you might use that word. The comment at the top of the code says "latency". When I hear "granularity", I

Re: [time-nuts] suggestions on getting 24 Mhz ?

On 4/11/18 3:00 AM, Pete Lancashire wrote: Needed for SDR project as external clock source. -pete I assume you mean derived from a high quality 10 MHz. some sort of discrete divide multiply? divide by 5 multiply by 12? A PLL with VCXO with good far out noise? (sort of like "clean up

Re: [time-nuts] suggestions on getting 24 Mhz ?

Leo Bodnar GPSDO - adjustable Low-jitter GPS-locked precision frequency reference 400 Hz to 810 MHz . He has a new one, single output for 99 british pounds. Jerry NY2KW -Original Message- From: time-nuts On Behalf Of Pete Lancashire Sent: Wednesday, April

Re: [time-nuts] Cheap jitter measurements

Hi > On Apr 11, 2018, at 4:58 AM, Hal Murray wrote: > > > g...@rellim.com said: >> It tests the time to do two back to back clock_gettime(). > > That's the time it takes to read the clock. That's not what I mean by > granularity but I think I see how you might use

Re: [time-nuts] TCVCXO Adjustment

Hi On a TCXO a proper 12 bit DAC should do fine. The “don’t use for DC” DAC’s that are built in to a MCU …. who knows. At DC they probably aren’t 12 bits anyway. If the TCXO is rated to age < 1 ppm per year and has a 10 ppm EFC (yes you *could* wonder about that combo) the DAC would need to

Re: [time-nuts] suggestions on getting 24 Mhz ?

Hi Pete, Speaking from limited experience, I wonder if a garden variety OCXO at say 10 MHz + some CMOS logic to act as a frequency multiplier might not fit the build? Then again, perhaps 24MHz is a little fast for the logic chips.. not sure. Hope this helps spark some discussion. Jim… N5SPE

Re: [time-nuts] Dual GPSDO - any advantage?

The seller added 100 pieces. At this moment 110 are sold. Auction #273145006434 Well it sounds too good to be true but I ordered 4 pieces just in case that it is real. With PayPal there is little risk. vy 73 Heinz DH2FA, KM5VT Von meinem iPhone gesendet > Am 10.04.2018 um 23:25 schrieb

Re: [time-nuts] Dual GPSDO - any advantage?

We use Excell nice to make plots and when needed add calculations File is to large for time nuts contact me direct and I will send you an exampleBert Kehren Sent from my Galaxy Tab® A Original message From: CORNACCHIA via time-nuts Date: 4/10/18 2:35 PM

Re: [time-nuts] suggestions on getting 24 Mhz ?

For and RSP? I used an HP 3325 locked to my Cs beam and took the signal from the back. I think I paid no more than $100 for the 3325a and one I got for free. Regards, Jerry > On Apr 11, 2018, at 4:49 AM, jster...@att.net wrote: > > Leo Bodnar GPSDO - adjustable Low-jitter GPS-locked

Re: [time-nuts] suggestions on getting 24 Mhz ?

Phase noise is (usually) more important than absolute frequency accuracy. I suggest some kind of low phase noise master oscillator (OCXO) feeding a DDS without an internal multiplier. If internal multiplier in DDS, that, rather than the frequency reference source will set the phase noise floor

Re: [time-nuts] suggestions on getting 24 Mhz ?

Yea, was also thinking of grabbing one of my 3325B's and hiding it under the desk :-) Going to see on Ebay if there are any 24 MHz VXCO's -pete On Wed, Apr 11, 2018 at 9:00 AM, Jerry Hancock wrote: > For and RSP? I used an HP 3325 locked to my Cs beam and took the signal >

Re: [time-nuts] suggestions on getting 24 Mhz ?

Hi > On Apr 11, 2018, at 12:11 PM, Graham / KE9H wrote: > > Phase noise is (usually) more important than absolute frequency accuracy. It’s probably well worth looking into exactly what you are after in terms of phase noise, spurs, and stability *before* deciding on a

[time-nuts] WWVB information

Hi, My Spectracom 8161 comparator and 8171A clock are chugging right along in sync with the proper time. I have only looked at the digital LED output and it is within one second of my other WWVB  clocks.  Seems like magic. It came in synch about two weeks ago and stayed there. I haven't changed

Re: [time-nuts] Cheap jitter measurements

Gary E. Miller writes: > It tests the time to do two back to back clock_gettime(). Output > looks like this: > > # ./clock_test > samples 101, delay 1000 ns > min 67 ns, max 302 ns, mean 176 ns, median 197 ns, StdDev 52 ns > > You run it a few times and you will see the granularity in the >

Re: [time-nuts] Any guesses as to how Citizen is claiming ±1 second/year with using this AT-cut 8.4MHz XTAL?

The aging spec on the 10811 is 5 parts in 10^10 per day. After 60 days, it could be off 30 ppb. So what we have here is a non-ovenized AT cut that is better than an ovenized SC cut. I'm sure. I am reminded of the old Accutron ads. The headlines guaranteed so many seconds a day or whatever it

Re: [time-nuts] Cheap jitter measurements

kb...@n1k.org said: > Except that’s not the way most timers run. The silicon needed to get a > programable divider to work at 2.4 GHz is expensive. If you dig into the > hardware descriptions, the clock tree feeds something much slower to the > “top end” of the typical timer in a CPU or

Re: [time-nuts] Any guesses as to how Citizen is claiming ±1 second/year with using this AT-cut 8.4MHz XTAL?

kb...@n1k.org said: > Before you say it can’t be done, the whole “average out” thing is how > time > pieces have been done for hundreds of years. The device may swing this way > and that …. done properly it eventually averages out. How well it works for > you … that depends. There

Re: [time-nuts] Any guesses as to how Citizen is claiming ±1 second/year with using this AT-cut 8.4MHz XTAL?

I have a Citizen A660 movement which was spec’d at +/- 5 secs per year. I monitored it from when I bought it in December 2010 until its battery failed on 03/11/2012. It was in spec when both on and off the wrist (off the wrist it was in a drawer at a constant temperature and the accuracy was a

[time-nuts] Citizen Concept watch: Ultraprecise Eco-Drive movement Calibre 0100

Hi: Claims +/- 1 second per year and is autonomous.  Uses an AT cut crystal at 8,388,608 Hz (2^23 ) and has a custom temperature compensation for each watch.  Solar powered, and the hands stop if the watch is in the dark to save power.

Re: [time-nuts] suggestions on getting 24 Mhz ?

Pete, Is your goal to make SDR frequency measurements? One solution: grab any 24 MHz oscillator you find but use a counter with known accurate timebase (Rb,Cs,GPSDO) to continuously record its actual frequency. Don't adjust the frequency; just record it. Then, apply those readings as

Re: [time-nuts] suggestions on getting 24 Mhz ?

On Wed, Apr 11, 2018 at 11:15 AM, Bob kb8tq wrote: > Hi > > > On Apr 11, 2018, at 12:11 PM, Graham / KE9H > wrote: > > > > Phase noise is (usually) more important than absolute frequency accuracy. > > It’s probably well worth looking into exactly what you

Re: [time-nuts] Any guesses as to how Citizen is claiming ±1 second/year with using this AT-cut 8.4MHz XTAL?

Hi Guess at the aging Cut the crystal so it’s fairly flat at 25 to 35C Do a basic / simple temperature compensation (TCXO) …. and count on the errors to average out. The success of all that will depend a lot on how close your wrist is to the environment they used for their guesswork. Did

Re: [time-nuts] Any guesses as to how Citizen is claiming ±1 second/year with using this AT-cut 8.4MHz XTAL?

In message <02d201d3d1b1$d7318640$859492c0$@joshreply.com>, tn...@joshreply.com writes: >That comes out to about 30ppb, and this is a pocket watch so they don't seem >to depend on the temp stabilization of being attached to a human wrist. For an application where neither phase noise

[time-nuts] Any guesses as to how Citizen is claiming ±1 second/year with using this AT-cut 8.4MHz XTAL?

That comes out to about 30ppb, and this is a pocket watch so they don’t seem to depend on the temp stabilization of being attached to a human wrist. https://www.ablogtowatch.com/wp-content/uploads/2018/03/Citizen-Cal-0100-Eco -Drive-Movement-04.jpg I’ve been reading about the new watch

Re: [time-nuts] Any guesses as to how Citizen is claiming ±1 second/year with using this AT-cut 8.4MHz XTAL?

HI > On Apr 11, 2018, at 5:38 PM, Richard (Rick) Karlquist > wrote: > > The aging spec on the 10811 is 5 parts in 10^10 per day. > After 60 days, it could be off 30 ppb. So what we > have here is a non-ovenized AT cut that is better > than an ovenized SC cut. I'm sure.

Re: [time-nuts] Any guesses as to how Citizen is claiming ±1 second/year with using this AT-cut 8.4MHz XTAL?

Way back in 1960 something Braun in Germany made a little alarm clock using a 4.194304 MHz crystal which could reach this level of accuracy.  I had one and it certainly met the Harrison level of timekeeping when I used it for navigation.  I think that the crystal cut used had a temperature

[time-nuts] time nuts overflow / gentle reminder

All -- This is a reminder that time-nuts is a technical mailing list. Please be careful with your replies. If you read, compose and hit send within 30 seconds, it's likely the post will sound like it belongs on social media instead of time-nuts. Our list works best when postings are well