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 machine's soul to an
g to tell you something.
>
That was inspired by this thread:
https://www.febo.com/pipermail/time-nuts/2006-December/022689.html (and
several 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
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... should hopefully f
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 detecting a brownout to
> > on
r. Your knowledge is vastly
> > greater than mine in the TF domain.
> >
> >
> >
> >> /tvb
> >>
> >> - Original Message -
> >> From: "Jan-Derk Bakker"
> >
> >> To: >
> >> Sent: Monday, June 19, 2
quot;Jan-Derk Bakker" >
To: >
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
> design. The full schematic can
;> /tvb
>>
>> - Original Message -
>> From: "Jan-Derk Bakker" >
>> To: >
>> Sent: Monday, June 19, 2017 3:44 PM
>> Subject: [time-nuts] Yet Another GPSDO design - Timing on the move
>>
>>
>>> Dear all
e 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
> design. The full schematic can be found at
https://drive.google.com/file/d/
> 0B7mNymXfcKMqaFcyRXdURC1KMX
k Bakker" >
> To: >
> 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
> &g
ly do outlier removal in a mobile platform which may get
> 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"
To:
S
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 f
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
Hi
That sounds like a close cousin of the Z3805
Bob
> On Aug 7, 2015, at 2:53 PM, Arthur Dent 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 will be listed
> for
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
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 wrote:
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
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
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 wrote:
>>
>>
>> Hi
>>
>> … and indeed it is one. There are a whole range of this and that pieces of
>> test gear designed
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 s
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
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. Th
On 18 Nov 2014 23:39, "Bob Camp" 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 ADEV and ph
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 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, 201
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 seve
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 wrote:
>
> BG7TBL sounds like an amateur radio callsign.
>
> Alan
>
> On Tue, Nov 18, 2014 at 5:24 PM, Bob Camp wrote:
>
>> Hi
>
BG7TBL sounds like an amateur radio callsign.
Alan
On Tue, Nov 18, 2014 at 5:24 PM, Bob Camp 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 board th
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:
http://www.ebay.com/itm/GPS-DISCPLINED-CLOCK-GPSDO-10M-OUTPUT-SQUAR
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 in
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 Morio
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
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 wrote:
> This is the strangest unit I have ever seen.
> No documentation.
>
> Morion OCXO
> http://www.morion.com.ru/eng/
> From St. Petersburg :)
>
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
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 No
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 --
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 wrote:
> I have a design which locks a high performance 10MHz OCXO to a 1
e 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
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
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? I
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 les
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 d
From: 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 referrin
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
applicat
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 tech
-boun...@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
...@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 Griffiths wrote:
>
>
>&g
Attila Kinali wrote:
On Tue, 29 Jun 2010 21:32:10 +1200
Bruce Griffiths 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 drift ref
> 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
> 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 enoug
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 adva
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 contac
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
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 with
On Tue, 29 Jun 2010 12:54:52 -0400
"Bob Camp" 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 proces
sage-
From: time-nuts-boun...@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,
>
>
bo.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 wrote:
> If we lower the size of each step to o
--Original Message-
From: time-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
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 v
On Tue, 29 Jun 2010 09:17:39 -0700 (PDT)
Stanley Reynolds 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 12 bit converters woul
-Original Message-
From: time-nuts-boun...@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:
&
uency measurement
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 an autocalibration technique would be us
set the
manual 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
On Tue, 29 Jun 2010 21:32:10 +1200
Bruce Griffiths 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 drift reference are require
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 exa
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 same
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
mis
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 tran
> 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.
http://www.onsemi.com/PowerSolutions/parametric
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 hav
On Sun, 27 Jun 2010 20:59:51 -0400
"Robert Benward" 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) you can push it
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
> i
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
Moin,
On Sun, 27 Jun 2010 02:24:31 -0700
Said Jackson 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 you mean tha
enman
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 design
drift 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"
To: time-nuts@febo.com
Sent: Sun, June 27, 2010 4:27:39 PM
Subject: Re: [time-nuts] yet another GPSDO
-
From: Stanley Reynolds
To: Discussion of precise time and frequency measurement
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 is as described in th
..@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
a dist
l
counter equals better unless the faster counter no longer averages out the +-
count.
Stanley
- Original Message
From: "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 10
quot;
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
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
qual
> "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
uot; 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"
To: time-nuts@febo.com
Sent: Sun, June 27, 2010 8:58:55 AM
Subject: Re: [time-nuts] yet a
about "slight random 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"
To: time-nuts@febo.com
Sent: Sun, June 27, 2010 8:58:55 AM
Su
. 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"
To: time-nuts@febo.com
Sent: Sat, June 26, 2010 8:14:02 PM
Subject: Re: [time-nuts] yet ano
- Original Message
From: "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
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 filter
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 v
Moin,
On Sat, 26 Jun 2010 12:38:29 -0600
Ed Palmer 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
design is newer, so tha
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
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 qu
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