Re: [time-nuts] Yet Another GPSDO design - Timing on the move

Thanks! for the nice reply. I did as you suggested and got a copy! Don On 2017-06-26 15:43, Jan-Derk Bakker wrote: On Mon, Jun 26, 2017 at 10:43 PM, djl wrote: I'd really like to have a look at the schematic, but trying to read it leads to some app requiring me to bare my

Re: [time-nuts] Yet Another GPSDO design - Timing on the move

veral others like it). I am very interested in what the outliers are trying to tell me. Is it because the satellite combination used for a fix has changed? Is it because we're sailing from the open countryside into an urban canyon (or under a big steel bridge)? Thanks for your feedback, JDB. >

Re: [time-nuts] Yet Another GPSDO design - Timing on the move

On Mon, Jun 26, 2017 at 10:43 PM, djl wrote: > I'd really like to have a look at the schematic, but trying to read it > leads to some app requiring me to bare my machine's soul to an unknown app > developer. Could plain .pdf be put somewhere not involving Google? > Save As...

Re: [time-nuts] Yet Another GPSDO design - Timing on the move

On Mon, 26 Jun 2017 10:43:24 -0700 "Tom Van Baak" wrote: > > down. U21 is a 128KB SRAM chip for scratch space, U13 is a FeRAM chip to > > store EFC settings (as EEPROM would wear out too fast with regular writes, > > and I cannot guarantee having enough energy after

Re: [time-nuts] Yet Another GPSDO design - Timing on the move

would say it is > > inherently self-contradictory. > > > > Perhaps in this context it does not matter. Your knowledge is vastly > > greater than mine in the TF domain. > > > > > > > >> /tvb > >> > >> - Original Message - > &g

Re: [time-nuts] Yet Another GPSDO design - Timing on the move

- From: "Jan-Derk Bakker" <jdbak...@gmail.com <javascript:;>> To: <time-nuts@febo.com <javascript:;>> Sent: Monday, June 19, 2017 3:44 PM Subject: [time-nuts] Yet Another GPSDO design - Timing on the move > Dear all, > > After a hiatus of seven years I hav

Re: [time-nuts] Yet Another GPSDO design - Timing on the move

er than mine in the TF domain. > > > >> /tvb >> >> - Original Message - >> From: "Jan-Derk Bakker" <jdbak...@gmail.com <javascript:;>> >> To: <time-nuts@febo.com <javascript:;>> >> Sent: Monday, June 19, 20

Re: [time-nuts] Yet Another GPSDO design - Timing on the move

ail.com <javascript:;>> To: <time-nuts@febo.com <javascript:;>> Sent: Monday, June 19, 2017 3:44 PM Subject: [time-nuts] Yet Another GPSDO design - Timing on the move > Dear all, > > After a hiatus of seven years I have finished the first version of my GPSDO &

Re: [time-nuts] Yet Another GPSDO design - Timing on the move

> From: "Jan-Derk Bakker" <jdbak...@gmail.com <javascript:;>> > To: <time-nuts@febo.com <javascript:;>> > Sent: Monday, June 19, 2017 3:44 PM > Subject: [time-nuts] Yet Another GPSDO design - Timing on the move > > > > Dear all, > > >

Re: [time-nuts] Yet Another GPSDO design - Timing on the move

t; bumped (leading to OCXO jumps). My starting point looks like Be careful about that. Act like there are no outliers: every point is trying to tell you something. /tvb - Original Message - From: "Jan-Derk Bakker" <jdbak...@gmail.com> To: <time-nuts@febo.com> Sent: Mo

[time-nuts] Yet Another GPSDO design - Timing on the move

Dear all, After a hiatus of seven years I have finished the first version of my GPSDO design. The full schematic can be found at https://drive.google.com/file/d/ 0B7mNymXfcKMqaFcyRXdURC1KMXM/view?usp=sharing (Google Drive seems to guess the file type wrong; Acrobat opens the file just fine). Its

[time-nuts] yet another GPSDO

I made some progress with the Symmetricom CGBA card I bought on Ebay and mentioned here last Friday. After getting it running and checked out, I took a closer look at the board to see if I could communicate with it. What I found was 3 unused holes on the board marked 'USER' and 2 of those pads had

Re: [time-nuts] yet another GPSDO

Hi That sounds like a close cousin of the Z3805 Bob On Aug 7, 2015, at 2:53 PM, Arthur Dent golgarfrinc...@gmail.com wrote: I picked up yet another version of a GPSDO on Ebay the other day. I thought that I'd mention this because sometimes when one unit shows up there are a lot more that

[time-nuts] yet another GPSDO

I picked up yet another version of a GPSDO on Ebay the other day. I thought that I'd mention this because sometimes when one unit shows up there are a lot more that will be listed for sale later, like with the many Lucent RFTG units that are currently being sold on Ebay. This one is a Symmetricom

Re: [time-nuts] Yet another GPSDO

Hi It also could be a club / group and these could be club design projects. If they are done from some sort of kit, the level of parts and workmanship may vary a bit. You do *not* want to buy the first Heathkit I ever built …. Since the surplus GPSDO’s we buy for a hundred dollars or so mostly

Re: [time-nuts] Yet another GPSDO

Hi After some more digging, the date convention used by the club or what ever it is: year - month - day. I sort of doubted that was the case, but indeed it is. The GPSDO has a design date of November 6th 2014. They are pretty much just out of beta test (if that) at this point. Bob On Nov

Re: [time-nuts] Yet another GPSDO

Hi After some more digging, I was more than a bit high on my kit cost estimate. The MV89’s are $5-$6 on the market in China. The PCBs as a set are under $3. Best guess is that the kit (if that’s what it is) sells for under $25 un-assembled. Bob On Nov 19, 2014, at 7:37 AM, Bob Camp

[time-nuts] Yet another GPSDO

I just noticed this on Ebay. The seller has several other related items but the pricing is kind of confusing. No a lot of info. http://www.ebay.com/itm/GPS-DISCPLINED-CLOCK-GPSDO-10M-OUTPUT-SQUARE-WAVE-/111514491254 -Arthur ___ time-nuts mailing list

Re: [time-nuts] Yet another GPSDO

Hi Assuming that the number that looks like a date on the front panel is indeed a date, the gizmo was designed about 3 months ago. The OCXO looks a *lot* like a surplus Morion part. I think I’ll let somebody else go first on doing all the ADEV and phase noise testing on that one … Bob On

Re: [time-nuts] Yet another GPSDO

This is the strangest unit I have ever seen. No documentation. Morion OCXO http://www.morion.com.ru/eng/ From St. Petersburg :) I cant make out any part number. except this number on the front panel: 06109a_y145_09 Google gives me nothing. I might buy one just for the hell of it. -George On

Re: [time-nuts] Yet another GPSDO

The other marking on the unit is BG7TBL do a Google search of images, interesting Wonder who it is ? -pete On Tue, Nov 18, 2014 at 3:34 PM, xaos x...@darksmile.net wrote: This is the strangest unit I have ever seen. No documentation. Morion OCXO http://www.morion.com.ru/eng/ From St.

Re: [time-nuts] Yet another GPSDO

Well, how about this: http://www.cart100.com/Product/42336500072/ Same unit as eBay about 10 bucks cheaper. -G On 11/18/2014 07:03 PM, Pete Lancashire wrote: The other marking on the unit is BG7TBL do a Google search of images, interesting Wonder who it is ? -pete On Tue, Nov 18, 2014

[time-nuts] Yet another GPSDO

You can see a similar product by this seller direct - http://www.cart100.com/seller/bg7tbl/ http://www.cart100.com/Product/38848104218/ Looks like a similar product at almost 3 time the Ebay price. There are more photos at the second link under 'specifications' and you can read MV89A on the

Re: [time-nuts] Yet another GPSDO

Hi I’d say this has the look of a hobby / semi-pro project. I’ve seen several of them done in other areas. Somebody comes up with a pile of parts at the local market and does a board that at least sort of makes them work. Often they are based on some sort of open source effort. Without more

Re: [time-nuts] Yet another GPSDO

In China they do it differently from what we do here: they tame the oscillator, and sometimes they discplined it as well :) In a message dated 11/18/2014 15:24:12 Pacific Standard Time, golgarfrinc...@gmail.com writes:

Re: [time-nuts] Yet another GPSDO

BG7TBL sounds like an amateur radio callsign. Alan On Tue, Nov 18, 2014 at 5:24 PM, Bob Camp kb...@n1k.org wrote: Hi I’d say this has the look of a hobby / semi-pro project. I’ve seen several of them done in other areas. Somebody comes up with a pile of parts at the local market and does a

Re: [time-nuts] Yet another GPSDO

Hi … and indeed it is one. There are a whole range of this and that pieces of test gear designed by the guy. Bob On Nov 18, 2014, at 7:28 PM, Alan Hochhalter alanh...@gmail.com wrote: BG7TBL sounds like an amateur radio callsign. Alan On Tue, Nov 18, 2014 at 5:24 PM, Bob Camp

Re: [time-nuts] Yet another GPSDO

The cheaper unit has no patch wires. Interesting. Seems that he put a lot of work in the unit. Too bad the information on the software is non-existent. Cheap enough though. -G On 11/18/2014 07:24 PM, Bob Camp wrote: Hi I’d say this has the look of a hobby / semi-pro project. I’ve seen

Re: [time-nuts] Yet another GPSDO

Hi The guy’s email *might* be: bg7...@126.com That also could be something else entirely. Bob On Nov 18, 2014, at 7:34 PM, Bob Camp kb...@n1k.org wrote: Hi … and indeed it is one. There are a whole range of this and that pieces of test gear designed by the guy. Bob On Nov 18,

Re: [time-nuts] Yet another GPSDO

On 18 Nov 2014 23:39, Bob Camp kb...@n1k.org wrote: Hi Assuming that the number that looks like a date on the front panel is indeed a date, the gizmo was designed about 3 months ago. The OCXO looks a *lot* like a surplus Morion part. I think I’ll let somebody else go first on doing all the

Re: [time-nuts] Yet another GPSDO

Hi After a bit of time with Mr. Google, I think it’s pretty clear that it’s an amateur project board. The same guy / outfit has a number of RF modules and instruments. The seem to show up mainly on the Russian and Chinese sites. I suspect that there is an article on each somewhere out there.

[time-nuts] Yet Another GPSDO

It looks like the boards, without front panel, connectors, etc., are available from this source. http://h5.m.taobao.com/awp/core/detail.htm?id=38848104218 Unfortunately, I don't speak the language but I might be able to guess the price. ___ time-nuts

Re: [time-nuts] Yet Another GPSDO

Hi Mr. Google is your friend when it comes to web page translations. The nice thing about that page is that you can easily see the 2003 date code on the OCXO. That’s a bit long on the stock room shelf for parts on a board made in 2014. The date codes match up with the eBay MV-89’s we’ve been

Re: [time-nuts] Yet another GPSDO

big 7 table Don Bob Camp Hi The guy’s email *might* be: bg7...@126.com That also could be something else entirely. Bob On Nov 18, 2014, at 7:34 PM, Bob Camp kb...@n1k.org wrote: Hi … and indeed it is one. There are a whole range of this and that pieces of test gear designed by the

Re: [time-nuts] Yet another GPSDO - locking to 10MHz

Hi Murray, Why did you use such a large division factor - or any for that matter? Could you not just have used a PLL with very long time constant running at 10 MHz? Peter On 27 June 2010 20:14, Murray Greenman murray.green...@rakon.com wrote: I have a design which locks a high

Re: [time-nuts] yet another GPSDO design, or so

Chris All the details are in the article: http://www.edn.com/contents/images/6607197.pdf However it would be best to read the article posted by Bob Camp first: Bruce Chris Stake wrote: Hi Bruce, This sounds like a promising idea, please could you expand on the synchronous filter technique?

Re: [time-nuts] yet another GPSDO design, or so

Here's a link to a pdf version of the synchronously filtered low ripple pwm dac: http://www.edn.com/contents/images/6553625.pdf Bruce Bruce Griffiths wrote: Chris All the details are in the article: http://www.edn.com/contents/images/6607197.pdf However it would be best to read the article

Re: [time-nuts] yet another GPSDO design, or so

and frequency measurement Subject: Re: [time-nuts] yet another GPSDO design, or so Here's a link to a pdf version of the synchronously filtered low ripple pwm dac: http://www.edn.com/contents/images/6553625.pdf Bruce Bruce Griffiths wrote: Chris All the details are in the article: http

Re: [time-nuts] yet another GPSDO design, or so

Moin, On Sun, 27 Jun 2010 02:24:31 -0700 Said Jackson saidj...@aol.com wrote: The 4002 expects a tight phase lock on the two inputs to properly stay locked, Why does the ADF4002 need that? Or do you mean by locked that the locked output of the ADF4002 does reflect the actual locked state? If

Re: [time-nuts] yet another GPSDO design, or so

Hi, What would be easier to try is to replace the gps internal Tcxo with an external ocxo, but you have to generate the frequency the gps is using, such as 26 MHZ and do some soldering on the gps itself. Yes, that would be an idea. But it's not that easy. I dont know how the control loop in

Re: [time-nuts] yet another GPSDO design, or so

Moin, On Sat, 26 Jun 2010 21:14:02 EDT ewkeh...@aol.com wrote: What you want is basically a Shera Board. That design has been around for quite some time and has served me very well. Yes. The Shera Board and similar designs serve as an example for me. I have a total of six running

Re: [time-nuts] Yet another GPSDO - locking to 10MHz

On Sun, 27 Jun 2010 20:59:51 -0400 Robert Benward rbenw...@verizon.net wrote: All this talk about interpolation reminds me of a little neat chip by Analog Devices, AD9500. It's programmable digital delay, bit, with lops resolution with a loons full-scale range. I believe (from app notes)

Re: [time-nuts] yet another GPSDO design, or so

Attila Kinali wrote: Moin, On Sat, 26 Jun 2010 21:14:02 EDT ewkeh...@aol.com wrote: What you want is basically a Shera Board. That design has been around for quite some time and has served me very well. Yes. The Shera Board and similar designs serve as an example for me. I

Re: [time-nuts] Yet another GPSDO - locking to 10MHz

Unfortunately, the AD9500 line is obsolete with no replacement. Which means it will be quite soon not available anymore. On-Semi makes a programmable delay: MC100EP195, 2.2 to 12.2 ns in 10 ps steps There are a couple of other similar chips.

Re: [time-nuts] yet another GPSDO design, or so

Hi, just a clarification, I did write 4066 it is a 4046 that I replaced. Take a look at the MCP 4822 dual 12 bit D/A In the data sheet they have an example using one for coarse, the other for fine steps, I realize that the transition is not perfect but maybe code can compensate for the

Re: [time-nuts] yet another GPSDO design, or so

The problem is that the gain and offset of the 2 DACs changes with time and temperature so that the required corrections also change. Ideally an autocalibration technique would be used to dynamically track such changes. Since changes in the coarse DAC are only required infrequently and the

Re: [time-nuts] yet another GPSDO design, or so

Not being able to write code and not understanding what is required it is easy for me to suggest a fix. In the case of a good Rub. the annual aging rate is 1 E-10 which would mean the lower 12 bits would cover one month. During transition the PIC could modify the time constant and at the

Re: [time-nuts] yet another GPSDO design, or so

Bruce Griffiths wrote: Attila Kinali wrote: Moin, On Sat, 26 Jun 2010 21:14:02 EDT ewkeh...@aol.com wrote: What you want is basically a Shera Board. That design has been around for quite some time and has served me very well. Yes. The Shera Board and similar designs serve as an

Re: [time-nuts] yet another GPSDO design, or so

On Tue, 29 Jun 2010 21:32:10 +1200 Bruce Griffiths bruce.griffi...@xtra.co.nz wrote: Its possible to build a 24 bit resolution D/A using a synchronously filtered PWM circuit. A pair of PWM outputs and a few relatively low precision resistors and capacitors together with a low noise low

Re: [time-nuts] yet another GPSDO design, or so

adjustment, because the aging rate of the old well run in units can be orders of magnitude better than their worse case spec after the first month or so of continuous operation. ws ** [time-nuts] yet another GPSDO design, or so Attila Kinali attila at kinali.ch Tue Jun 29 13:31:34

Re: [time-nuts] yet another GPSDO design, or so

of precise time and frequency measurement time-nuts@febo.com Sent: Tue, June 29, 2010 5:31:50 AM Subject: Re: [time-nuts] yet another GPSDO design, or so The problem is that the gain and offset of the 2 DACs changes with time and temperature so that the required corrections also change. Ideally

Re: [time-nuts] yet another GPSDO design, or so

...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Bruce Griffiths Sent: Tuesday, June 29, 2010 5:32 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] yet another GPSDO design, or so Attila Kinali wrote: Moin, On Sat, 26 Jun 2010 21:14:02 EDT ewkeh

Re: [time-nuts] yet another GPSDO design, or so

On Tue, 29 Jun 2010 09:17:39 -0700 (PDT) Stanley Reynolds stanley_reyno...@yahoo.com wrote: If we lower the size of each step to over lap more would this lower the error ?  Software would adjust both converters at the cross over point so neither would change it's full range at this point. Two

Re: [time-nuts] yet another GPSDO design, or so

On 6/29/2010 11:10 AM, Attila Kinali wrote: Yes, 16bit D/A seems to be the maximum that is currently available. It crossed my mind to build a 24bit R-2R D/A using discrete components, but this might have actually a worse performance than a off the shelf 16bit D/A. (temperature drifft, resistor

Re: [time-nuts] yet another GPSDO design, or so

-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Attila Kinali Sent: Tuesday, June 29, 2010 12:42 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] yet another GPSDO design, or so On Tue, 29 Jun 2010 09:17:39 -0700 (PDT) Stanley Reynolds

Re: [time-nuts] yet another GPSDO design, or so

Sent: Tuesday, June 29, 2010 12:42 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] yet another GPSDO design, or so On Tue, 29 Jun 2010 09:17:39 -0700 (PDT) Stanley Reynolds stanley_reyno...@yahoo.com wrote: If we lower the size of each step to over lap more

Re: [time-nuts] yet another GPSDO design, or so

[mailto:time-nuts-boun...@febo.com] On Behalf Of Bruce Griffiths Sent: Tuesday, June 29, 2010 5:32 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] yet another GPSDO design, or so Attila Kinali wrote: Moin, On Sat, 26 Jun 2010 21:14:02 EDT ewkeh...@aol.com wrote

Re: [time-nuts] yet another GPSDO design, or so

On Tue, 29 Jun 2010 12:54:52 -0400 Bob Camp li...@rtty.us wrote: Some of the TI (Burr Brown) 16 bit parts are 1/4 lsb DNL on 98% of the transitions. Most of the time you have a coarse DAC that's at 18 bits. Some of the errors are predictable and you can take them out with a simple training

Re: [time-nuts] yet another GPSDO design, or so

offers out there for this device, because repair of the audio equipment is prohibitive Bert -Original Message- From: ewkeh...@aol.com To: time-nuts@febo.com Sent: Tue, Jun 29, 2010 1:45 pm Subject: Re: [time-nuts] yet another GPSDO design, or so Hi just bought four AD 1861 on ebay

Re: [time-nuts] yet another GPSDO design, or so

and there will be more reasonable offers out there for this device, because repair of the audio equipment is prohibitive Bert -Original Message- From: ewkeh...@aol.com To: time-nuts@febo.com Sent: Tue, Jun 29, 2010 1:45 pm Subject: Re: [time-nuts] yet another GPSDO design, or so Hi just

Re: [time-nuts] yet another GPSDO design, or so

On Tue, 29 Jun 2010 14:07:17 EDT ewkeh...@aol.com wrote: just bought four AD 1861 on ebay with shipping was $11 each. Will see hat I get, but they are out there and 18 bit will cover in my opinion most Any one interested should hold off for a day buying. I have contacted the

Re: [time-nuts] yet another GPSDO design, or so

bruce.griffi...@xtra.co.nz said: Its possible to build a 24 bit resolution D/A using a synchronously filtered PWM circuit. A pair of PWM outputs and a few relatively low precision resistors and capacitors together with a low noise low drift reference are required. The technique takes

Re: [time-nuts] yet another GPSDO design, or so

Another approach is to distribute the individual bits rather than clump them together. If you want 1/2, send 10101010 rather than . You would have to do something like build a bit pattern in memory and use a serial port to send it out. I can't determine if that's good enough.

Re: [time-nuts] yet another GPSDO design, or so

or with a pair of current output DACs and a resistive divider/summer so you have a high order and low order voltage. If it were that simple, the manufacturers would package it up into a single chip. :) I think there are two areas of interest. One is the obvious one that steps on the

Re: [time-nuts] yet another GPSDO design, or so

Attila Kinali wrote: On Tue, 29 Jun 2010 21:32:10 +1200 Bruce Griffithsbruce.griffi...@xtra.co.nz wrote: Its possible to build a 24 bit resolution D/A using a synchronously filtered PWM circuit. A pair of PWM outputs and a few relatively low precision resistors and capacitors together

Re: [time-nuts] yet another GPSDO design, or so

...@febo.com] On Behalf Of Bruce Griffiths Sent: Tuesday, June 29, 2010 4:07 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] yet another GPSDO design, or so Attila Kinali wrote: On Tue, 29 Jun 2010 21:32:10 +1200 Bruce Griffithsbruce.griffi...@xtra.co.nz wrote

Re: [time-nuts] yet another GPSDO design, or so

...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Bruce Griffiths Sent: Tuesday, June 29, 2010 4:07 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] yet another GPSDO design, or so Attila Kinali wrote: On Tue, 29 Jun 2010 21:32:10 +1200 Bruce

Re: [time-nuts] yet another GPSDO design, or so

Hal Murray wrote: bruce.griffi...@xtra.co.nz said: Its possible to build a 24 bit resolution D/A using a synchronously filtered PWM circuit. A pair of PWM outputs and a few relatively low precision resistors and capacitors together with a low noise low drift reference are required. The

Re: [time-nuts] yet another GPSDO design, or so

Hi Bruce, This sounds like a promising idea, please could you expand on the synchronous filter technique? I have seen some articles about how such filters can be used to clean up the data from rotating machinery for vibration analysis etc. but I don't follow how they can be used in a PWM

Re: [time-nuts] yet another GPSDO design, or so

: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Bruce Griffiths Sent: Tuesday, June 29, 2010 4:34 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] yet another GPSDO design, or so Bob Camp wrote: Hi Are you referring to something like

Re: [time-nuts] yet another GPSDO design, or so

Hal Murray wrote: or with a pair of current output DACs and a resistive divider/summer so you have a high order and low order voltage. If it were that simple, the manufacturers would package it up into a single chip. :) And they do... hence delta sigma designs.. Back in the good old days

Re: [time-nuts] yet another GPSDO design, or so

Hi Ok, here's a BOM: TI DAC8581 $1.85 each, two for 3.70 Linear LTC 2493 $2.95 TI LM4040C50$0.36 Freescale MCF52254AF80 $4.38 Quad Op-amp $1.00 Misc resistors and caps $3.00 Other semi's$2.00 Total $17.39 at moderate volume prices. Depending on your shopping approach likely

Re: [time-nuts] yet another GPSDO design, or so

Moin-Moin Atilla, The 4002 expects a tight phase lock on the two inputs to properly stay locked, and your adc/dac will likely introduce too much phase lag and cause oscillation. In fact when using the Analog Devices PLL simulator one has to closely follow the component values of the loop

Re: [time-nuts] yet another GPSDO design, or so

- Original Message From: ewkeh...@aol.com ewkeh...@aol.com To: time-nuts@febo.com Sent: Sat, June 26, 2010 8:14:02 PM Subject: Re: [time-nuts] yet another GPSDO design, or so Attilia What you want is basically a Shera Board. That design has been around for  quite some time and has served me very well

Re: [time-nuts] yet another GPSDO design, or so

. The faster clock would reduce the need for this but without the right amount of jitter we lose the benefit of this average. Stanley - Original Message From: ewkeh...@aol.com ewkeh...@aol.com To: time-nuts@febo.com Sent: Sat, June 26, 2010 8:14:02 PM Subject: Re: [time-nuts] yet

Re: [time-nuts] yet another GPSDO design, or so

drift what is slight at 24 Mhz is it also slight at 100 Mhz ? An average of 30 samples does have a limit to what it will correct. Stanley  - Original Message From: ewkeh...@aol.com ewkeh...@aol.com To: time-nuts@febo.com Sent: Sun, June 27, 2010 8:58:55 AM Subject: Re: [time-nuts] yet

Re: [time-nuts] yet another GPSDO design, or so

is it also slight at 100 Mhz ? An average of 30 samples does have a limit to what it will correct. Stanley - Original Message From: ewkeh...@aol.com ewkeh...@aol.com To: time-nuts@febo.com Sent: Sun, June 27, 2010 8:58:55 AM Subject: Re: [time-nuts] yet another GPSDO design, or so

Re: [time-nuts] yet another GPSDO design, or so

 Interestingly, it is desirable to have the frequency of U7 drift slightly rather than being synchronized with the VCXO. A slight random drift averages out the count ambiguity that is inherent in any pulse-counting device. My measurements indicate that the simple phase-measuring circuit I use

[time-nuts] Yet another GPSDO - locking to 10MHz

I have a design which locks a high performance 10MHz OCXO to a 10MHz source which should work equally well with the LEA5, or any source of 5 or 10MHz. I designed it for use with a distributed factory GPS reference which has picked up noise, hum and phase modulation, in order to deliver a high

Re: [time-nuts] yet another GPSDO design, or so

To: time-nuts@febo.com Sent: Sun, June 27, 2010 1:17:51 PM Subject: Re: [time-nuts] yet another GPSDO design, or so Going from 24 to 100 MHz only gives you smaller steps (resolution) every  thing else stays the same. If the he saw 2 to 3 nsec should be more like 8, going to 100 MHz will  improve

Re: [time-nuts] yet another GPSDO design, or so

equals better unless the faster counter no longer averages out the +- count. Stanley - Original Message From: ewkeh...@aol.com ewkeh...@aol.com To: time-nuts@febo.com Sent: Sun, June 27, 2010 1:17:51 PM Subject: Re: [time-nuts] yet another GPSDO design, or so Going from 24 to 100 MHz

Re: [time-nuts] yet another GPSDO design, or so

ewkeh...@aol.com To: time-nuts@febo.com Sent: Sun, June 27, 2010 4:27:39 PM Subject: Re: [time-nuts] yet another GPSDO design, or so Stanley I am not an expert but it is not only the jitter it is the fact that since  the two sources are not linked the independent drift of the 100 MHz causes

Re: [time-nuts] yet another GPSDO design, or so

stanley_reyno...@yahoo.com To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Sun, June 27, 2010 5:23:13 PM Subject: Re: [time-nuts] yet another GPSDO design, or so Jitter may not be the correct word. I also don't know how accurate or repeatable the averaging effect

Re: [time-nuts] yet another GPSDO design, or so

is too big we will over shoot to the next higher integer number and this will bias the average up too high. Stanley - Original Message From: ewkeh...@aol.com ewkeh...@aol.com To: time-nuts@febo.com Sent: Sun, June 27, 2010 4:27:39 PM Subject: Re: [time-nuts] yet another GPSDO

Re: [time-nuts] Yet another GPSDO - locking to 10MHz

To: time-nuts@febo.com Sent: Sunday, June 27, 2010 3:14 PM Subject: [time-nuts] Yet another GPSDO - locking to 10MHz I have a design which locks a high performance 10MHz OCXO to a 10MHz source which should work equally well with the LEA5, or any source of 5 or 10MHz. I designed

[time-nuts] yet another GPSDO design, or so

Moin, I recently had a look at the data sheet of the LEA6-T GPS module from ublox, which now features a second time pulse output that is capable of delivering a 10MHz signal, synchronized to GPS. After thinking quite some time quite some time about building my own GPSDO and struggling with the

Re: [time-nuts] yet another GPSDO design, or so

Hello Attila, Another GPS board with a 10 MHz output is the Navsync CW-12 module (price ~US$85-90). I measured the 1 PPS output and found a Standard Deviation of 5 ns with a range of 30 ns. The 10 MHz output is kept on frequency by occasionally adjusting the period of the 10 MHz output

Re: [time-nuts] yet another GPSDO design, or so

Moin, On Sat, 26 Jun 2010 12:38:29 -0600 Ed Palmer ed_pal...@sasktel.net wrote: Another GPS board with a 10 MHz output is the Navsync CW-12 module (price ~US$85-90). Hmm.. i didn't know about this one. Both seem to be comparable from the specs, the LEA6-T being slightly better (well, the

Re: [time-nuts] yet another GPSDO design, or so

Attilia What you want is basically a Shera Board. That design has been around for quite some time and has served me very well. I have a total of six running including two controlling Rubidium. There are in my opinion a couple of problems: not every 4066 works on the design the 18 bit D/A is