ple
> I have of the 3801 and KS boxes are pretty darn close.
>
> Bob
>
>> On Nov 27, 2014, at 6:45 PM, Said Jackson via time-nuts
>> wrote:
>>
>> The 58503A we got have much better ADEV and PN than what was posted recently
>> on the Lucent boxes.
The 58503A we got have much better ADEV and PN than what was posted recently on
the Lucent boxes. TVB has many plots of the Z3801A on his website - same box.
They used to be $399 on eBay, now likely $500 or more, but you get what you pay
for..
Sent From iPhone
> On Nov 27, 2014, at 16:14, Bob
We have a number of these upgraded units from China, ours have the double oven
10811 and they are awesome. Great ADEV and great PN and very little spurs. In
fact we use them as house standards for our TimePod and TSC5125A.
They are upgraded to a nice desktop case and the 58503A firmware.
They m
Jim,
A double tragedy. I was working with Jim Williams on one of our designs a week
before he passed away. Then Bob crashed his car coming from Jim's funeral
(grief?) and died too.
Two of the greatest analog minds lost within days.
Bye,
Said
Sent From iPhone
> On Nov 26, 2014, at 9:34, Jim S
:)
Sent From iPhone
> On Nov 26, 2014, at 9:20, Didier Juges wrote:
>
> Said,
>
> Your drawing looks better than those by Bob Pease, and he was never
> embarrassed by his :)
> Thank you for your extensive contributions to time nuts
>
> Didier KO4BB
>
>
>> On Tue, Nov 25, 2014 at 7:28 PM, S
Bob,
Its not the 1PPS that would be suffering, its the 10MHz that will have all the
1Hz and its harmonics making the PN graph look ugly..
Agree with you that the regulators cost zip these days and using individual
buffer ICs and regs is the best way to go.
Bye,
Said
Sent From iPhone
> On Nov
Paul,
You can listen to PJLTS on the USB and grab the Skytrack NMEA in TTL format
from pin 13 of header JP1 at the same time..
Sent From iPhone
> On Nov 25, 2014, at 15:37, Paul wrote:
>
>
>
>> On Tue, Nov 25, 2014 at 6:03 PM, Joseph Gray wrote:
>> Yes, I know that NMEA is standard. I assu
It does output two proprietary messages, one from Skytrack, but not sure I
would use the Skytrack application due to the low information content of that
message and the instability of the Skytrack app. The uBlox app lets you view
the two proprietary messages too and is stable. Everyone can use t
We evaluated a Glonass unit for 1PPS and it was really quite bad. Unless you
are near the poles or get jammed a lot I would not see much advantage..
Sent From iPhone
> On Nov 25, 2014, at 15:10, Bob Camp wrote:
>
> Hi
>
> I think it’s more a supply and demand thing right now. There are a lot
100 ohm load continuously so you can use parallel termination at
> the far end.
>
> - Dave
>
> On Tue, Nov 25, 2014 at 12:23 AM, Hal Murray
> wrote:
>
>>
>> Said Jackson said:
>>> Correct, and thats why its all a bad trade off if you have to use 50 Oh
Charles,
The increased current for the driver will cause heating near the crystal in
both the CMOS driver and the 3.0V LDO as the LDO has to convert the excess
voltage into heat. This may or may not affect the crystal.
One could certainly try, this is why I initially said its certainly possible
in
> the car says my antenna should be at. (1250' at the drive way, plus 20 feet
> of pole supporting the antenna.)
>
> Jim
>
>> On 11/24/2014 8:27 PM, Said Jackson wrote:
>> Jim,
>>
>> Bobs suggestion is good; look at for example the LT3060
Jim,
Bobs suggestion is good; look at for example the LT3060 for something that
needs less than 100mA.
Glad your antenna is working well. What C/No numbers is uBlox indicating?
Bye,
Said
Sent from my iPad
On Nov 24, 2014, at 16:28, Bob Camp wrote:
> Hi
>
> The Linear LT1764 is a pretty go
months ago
here in detail..
Sent From iPhone
> On Nov 24, 2014, at 5:32, "Dr. David Kirkby (Kirkby Microwave Ltd)"
> wrote:
>
> On 24 November 2014 at 03:44, Said Jackson via time-nuts
> wrote:
>> On the 20MHz units there is already a strong buffer that can dr
Charles,
Any buffer options added to the board would have caused either additive phase
noise or added power consumption, and possibly yet another low noise LDO to be
required.
On the 20MHz units there is already a strong buffer that can drive 50 Ohms
terminations so adding a buffer in front of
Tom,
>From the looks of the plots these may be from the first proto unit with early
>software no? Also was this with the indoor GPS antenna setup?
The production units with outdoor or windowed' antenna should have
significantly improved average performance from the first unit and its early
GPS
Bill,
Check out the Ettus Octoclock. Its probably without competition at their $900
price point:
https://www.ettus.com/content/files/Octoclock_Spec_Sheet.pdf
Its very compact and quite useful. Is it the lowest noise amp ever built? No.
But its state of the art for low-cost distribution of 1PP
Nigel,
CC'ing time nuts..
R2 and R3 are stuffing options, see the schematics in the user manual.
Typically you don't have to solder anything. The default is set for the
low-noise 3.0V to be fed to the DIP-14 tcxo for best performance.
On your question on removing the SMT Tcxo, this is not easy
Hi Paul, Jim, David,
Let me address all your emails:
Glad you got your boards. $50 in overseas additional charges from your post
office sucks!
Some hints for experimenting from what I have learned:
You definitely want to build a 50 Ohms buffer for the 10MHz boards and the
synthesized outputs
Thanks Paul, Glad you like it!
On the PSTI question from earlier: the GPS vendor snuck two additional fields
into the PSTI message on their last fw update. The two new fields are as
follows:
Position Standard Deviation Threshold
Calculated Position Standard Deviation After Self-Survey
The firs
Correct on all counts Bob.
My two 58503A units from China are great for both ADEV and PN measurements,
better than anything else I have as a combo (I have Wenzel ULNs for even lower
PN testing but they don't have any usable ADEV). I also have a costly BVA and
it can't compete against the HP un
Sometimes eBay limits the number of units a vendor can list at any time to
limit their financial responsibility.. Happened to us.
Sent From iPhone
> On Nov 17, 2014, at 12:14, Bob Camp wrote:
>
> Hi
>
> It’s pretty simple. Put X pieces in your cart and see what happens. At the
> point you ca
Bob, how is the PN?
Glad that after 100s of emails about the serial port on this unit finally
someone is finally posting some real data.
Still surprised that the ADEV is not as good as the 58503A units I got on eBay.
Sent From iPhone
> On Nov 17, 2014, at 8:22, Bob Camp wrote:
>
> Hi
>
> He
The premise of higher than "normal" click speed is false in the article too
because the complex NOR gate is slow with that many inputs, and its tpd needs
to be added to the Tsu and Tco of the flip flop chains, as well as the pcb
propagation delays through the worst case trace..
It would have be
Whatever the source for that signal, it may explain why all our wwvb clocks
have had receiving troubles over the last weeks syncing up here in NV...
Sent from my iPad
On Nov 14, 2014, at 6:10, paul swed wrote:
> OK everyone. I am sorry I left my 60 Khz transmitter on in Boston. Good to
> see i
ncesco Messineo
> wrote:
>
> Sorry if I hijack the thread...
>
> On Sat, Nov 8, 2014 at 5:20 AM, Said Jackson via time-nuts
> wrote:
>> Joe,
>>
>> This puppy can go to 166MHz over temp and has standard 100 mil pin spacing
>> if you put it into a socket:
Hal,
That means in a divide by 5 you cant even get close to 125MHz even if the
74lvc163 is rated at 200MHz count frequency. Very good point.
I used to use ABEL with DataIO programmers back in the day, Abel is now
licensed by Lattice and I think they still support the old 16V8 and 22V10
types
y,
> but rated to in excess of 100mhz, some vendors as high as 120mhz, at ordinary
> temps. I will have to look, but I might have a tube or two of them in the
> basement. I know I have most of the other 74F.
>
>> On Nov 7, 2014, at 23:20, Said Jackson via time-nuts
>> w
Joe,
This puppy can go to 166MHz over temp and has standard 100 mil pin spacing if
you put it into a socket: ATF16V8C
I have not used PALs since 1992 but I used to be extremely fond of the 16R8 and
22V10 types back then.
This is a 16V8 that will do your divider in no time:
http://www.digikey.
That part is limited to 95MHz over temp. Not suitable for commercial designs,
but probably works just fine for a one-off..
Sent From iPhone
> On Nov 7, 2014, at 19:37, Joseph Gray wrote:
>
> Looks like I can get the 74AC161 in DIP from Mouser. Thanks to everyone for
> the suggestions. I still
Same here Nigel,
However I seem to have gotten about 200+ emails about a Lucent GPSDO over the
last couple of days so something is working, or the list simply got inundated
with Lucent KS-24361 related emails.
Bye,
Said
Sent from my iPad
On Nov 4, 2014, at 7:12, GandalfG8--- via time-nuts wr
Karen,
PRS-10..
Sent From iPhone
> On Oct 26, 2014, at 10:46, "Karen Tadevosyan" wrote:
>
> Hello All,
>
>
>
> Can I have your recommendation regarding a choice of 10 MHz rubidium source
> (available now on eBay like FE-5680; LPRO-101; LPFRS; FRS etc.) as a
> reference signal for my frequen
I have detailed pictures if
> anyone is interested.
>
> I don't know if the above offers any input of value, or even how scientific
> it is according to "deep" Time-Nuts standards, but it's what I did.
>
> Burt, K6OQK
>
>> From: "Poul-Hennin
Hi Hal,
This behavior is called hysteresis and it is related to vendors, and related to
the chips used (or varactor diode) inside the tcxo/ocxo. It is so subtle that
most vendors are not even aware that their oscillator is doing it. Some vendors
have product lines that do it and others that don
ge <766d6811-f733-4ab2-8574-24e4606e4...@aol.com>, Said Jackson via
> tim
> e-nuts writes:
>> Thats exactly right Bob.
>>
>> By the time your ocxo jumps to catch up to the efc voltage, you
>> have oversteered, then the process starts in reverse and the ocxo
>> jump
few weeks. I may even make changes that will keep the DAC stable when
> loading new code.
>
> Thanks!
>
> Bob
>
> From: Said Jackson
> To: Bob Stewart ; Discussion of precise time and frequency
> measurement
> Sent: Monday, October 20, 2014 7:21 PM
> Subj
Bob,
You are on the right track!
Large changes in EFC can cause hysteresis, meaning you go back to an initial
voltage but the crystal does not return to the exact initial frequency. It can
also create dead bands in the efc vs frequency curve.
Hysteresis can cause integrator wind up as the loop
Paul,
I will answer you offline.
Guys please don't post items like this that aren't really of interest to all
the others on the list.
Thanks,
Said
Sent From iPhone
> On Oct 20, 2014, at 13:41, paul swed wrote:
>
> Said
> Having some fun reading your posts on time-nuts.
>
> I placed an orde
Hi Bill,
I think it makes perfect sense. But I have no idea how the units' loop
stability would be with the 10811. That kind of testing is on the plate.
You would preferably set the OCXO to a nominal tuning voltage of 1.5V using the
mechanical adjustment, then let the LTE Lite do the rest.
Ple
Thanks much Alan!
It would be funny if it wasn't so serious. Guys let me know (but please without
copying the entire list!) if Ebay is not working out for you and we will find a
way..
Bye,
Said
Sent From iPhone
> On Oct 18, 2014, at 13:34, "Alan Melia" wrote:
>
> Said I read through the des
Tom,
Nice performance. Wish we could get that today! My fairly modern BVA is nowhere
near that stability.
If you open up a brand new DOCXO you will see a crystal designed in the 70's
and an oscillator circuit designed sometime in the 30's or 40's, maybe updated
to a more or less modern transi
> Stéphane Rey wrote:
>> " With that VCXO you want to have a 5s to 10s or more loop time
>> constant (0.1Hz BW) which typically can only be done in the digital
>> domain.."
>>
>> Hi Said,
>> Could you point us on something describing that ? What kind o
Hal,
An ocxo has two effects that cause a frequency change after power on: heater
stabilization and crystal retrace.
Heaters usually stabilize quickly (1 - 2 minutes for DIP-14 ocxo, 7 to 10
minutes for typical eurocan docxo's) and then a. ~30 minutes soak until the
ocxo starts following ambie
Mark,
In the analog domain you can probably do a PLL with a 1Hz loop BW. Using a PLL
chip like ADF 4002 or similar. This means all the nasty noise from the NEO will
taint your PN up to 20Hz or more, very significantly close-in. If you don't
care about noise (jitter) below 100Hz then this is fin
Hi everyone,
Thanks so much for your interest in our new LTE-Lite GPSDO.
I got something like 40 or more email inquiries so far! Its been a fantastic
response, thank you everyone.
We will try to get everyone's emails and questions answered next week, please
hang in there, and sorry that I cann
Hi Hal,
I think its a slow driver, and a complex output impedance, not necessarily a
weak driver.
I have a Tbolt hidden somewhere and would need to dig it out. My 30 foot cable
disappeared though, so I need to buy a new one :(
On the small hump, i don't think that is a reflection. The signal r
Hi Didier,
You showed the effect of standard end-termination and no end-termination both
while driving the cable with a mis-matched low signal source impedance. These
are the same type of plots that Tom posted a link to last week.
The interesting plots will be when you set R1 to match the cable
Hi Stephanie,
Welcome to the list!
We designed a 1GHz crystal LO for PLLs (the ULN-1G) using an off the shelf
miniature 500MHz crystal oscillator which is run at 3 rd overtone internally
then using a diode doubler and a steep bandpass filter using several Mini
Circuits ceramic filters and a 20
Hi guys,
Tried to bring my point across, but I guess I failed to do so properly.
What happens after the edge is very important because what happens after the
edge settles is up to 100mA DC current is flowing through all the coaxes AND
your building ground.
Pumping ~5V into 50 Ohms (Thunderbolt
function of the length of
>> the coax? Isn't it the price you pay for mismatched impedances?
>>
>> Pete.
>>
>>
>> -Original Message-
>> From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Said
>> Jackson via time-nuts
nto as you approach the sampling limits of digital scopes.
>
> Pete.
>
>
> -Original Message-
> From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Said
> Jackson via time-nuts
> Sent: Sunday, September 14, 2014 11:36 AM
> To: Discussion of p
nd got a little better than 4 nS
> risetime.
>
> Isn't the ringing frequency simply a function of the length of
> the coax? Isn't it the price you pay for mismatched impedances?
>
> Pete.
>
>
> -Original Message-
> From: time-nuts [mailto:time-nuts-bo
Ok, did the math, a 4ns risetime should be ok on a 200MHz scope.
You likely won't see the oscillations and reflections visible in Toms 58503A
plots for example, they are faster than the risetime.
Bye,
Said
Sent From iPhone
> On Sep 14, 2014, at 8:35, Said Jackson via time-nuts
Peter,
You don't need nor do you want a 50 ohms end-termination on a series-terminated
50 ohms coax cable.
This has been discussed here extensively before, please check the archives.
Your last sentence is not correct.
Also, you are running into your scope's BW limit if you are measuring a 4ns
Tom,
Btw part of my frustration with this is that we sometimes get calls from
customers asking why they need our or others' GPSDOs for a couple 100 dollars
when they can buy a CW or uBlox doing "the same thing" for a fraction of the
cost.
Most of them come back to us after evaluating these NCO
Graham,
Those are not GPSDO's by definition.
They are based on NCO technology.
The difference being many orders of magnitude higher phase noise and ADEV noise.
We tried to measure their phase noise and our TSC5125A could not even lock on
to the 10MHz - they were so noisy.
You can make a GPSD
Wonderful. It also means cell phones will crank up their power searching for a
signal, and the passengers are sitting inside a microwave oven since the RF
energy can't escape.
Thankfully there are alternative ways to fly.
Bye,
Said
Sent From iPhone
On Jun 2, 2014, at 8:45, Chris Albertson wr
Yeah, we have to have some undocumented commands..
The 600 is 10 minute sample intervals. The 288 is number of samples saved, so
it samples 48 hours of data..
Bye,
Said
Sent From iPhone
On Apr 28, 2014, at 12:02, Hans Holzach wrote:
> said,
>
> very nice, a secret command that is not mentio
Bill,
There is an easier method that does not jiggle the board mechanically:
The command:
sync:hold:init
Disables the disciplining.
sync:hold:rec:init
Re-enables disciplining.
The sync:tint? command can be used to check the drift while in holdover..
Bye,
Said
Sent From iPhone
On Ap
Take a look at Ulrich's Z38xx application, run it in Windows XP compatibility
mode..
Sent From iPhone
On Apr 26, 2014, at 10:35, Tommy phone wrote:
> Old W98 or W2k machines work for me.
>
> From Tom Holmes
>
>
>> On Apr 26, 2014, at 1:29 PM, Larry McDavid wrote:
>>
>> I just tried to run
Shane,
The trade off for most applications is as follows:
Rb has much faster stabilization time after power on. Ocxos suffer from
retrace, that can take hours to days to get rid off. Retrace could cause a
frequency shift of several ppb or more from say 15 minutes after power on
compared to 10
Hi Atilla,
Appreciate your support.
That was a Monday morning quarterback that has no decorum to sign his name to
his posts and uses a bogus email alias. Probably a competitor that is sour that
they cannot compete with Microsemi's CSAC technology on any meaningful level. I
have noted many anon
o play with?
>
> Regards,
>
> Jim Palfreyman
>
>
>
> On 25 April 2014 11:26, Said Jackson wrote:
>
>> Hi Magnus, Bob,
>>
>> Thanks much for your kind words.
>>
>> The failure rate is thankfully so low that we are not greatly alarmed, and
>
Hi Magnus, Bob,
Thanks much for your kind words.
The failure rate is thankfully so low that we are not greatly alarmed, and
Microsemi has been a champ in resolving any failures with/for us when they did
show up. We are awaiting the results of the full re-qualify that Microsemi is
doing on the
Hi anonymous,
While I have not read the article yet and look forward to doing so, this is not
exactly new technology.
It is what allows our LC-XO GPSDO to have only about 0.2W difference between
the TCXO and OCXO versions. Our FireFly-1A has been using this technology in
the OCXO since 2007...
Guys, someone somehow hacked my address book and has been going through it
slowly and sending spam in my name. Please do not open the attachments or links
if you get a link from "me".
Sent From iPhone
___
time-nuts mailing list -- time-nuts@febo.com
To
board and component
> compliment.
> Regards,
> Brent
>
>> On Apr 4, 2014, at 20:19, Said Jackson wrote:
>>
>> Paul,
>>
>> Forgot to mention, there is a spec sheet on the website on the LC-XO-Plus
>> product page with additional technical details.
>
Paul,
Forgot to mention, there is a spec sheet on the website on the LC-XO-Plus
product page with additional technical details.
Bye,
Said
Sent from my iPad
On Apr 4, 2014, at 17:45, paul swed wrote:
> I mean no disrespect to anyone here. Jacksonlabs makes some very fine
> components. Brookes
Hi guys,
Let me try to answer the questions.
This unit is placed to fill a need for lower cost plug-and-play units than what
our Fury offers. The Fury desktop DOCXO sells for around $1700 if I am not
mistaken, and literally 100's of them are sold every year. This is not trying
to address a $50
Michael,
I was able to get a $50 Time-Nuts discount from the marketing guys..
Just mention "$50 time nuts discount"..
Bye,
Said
Sent From iPhone
On Apr 4, 2014, at 15:58, Michael Perrett wrote:
> If you are going to plug the unit re time nuts, how about a price break for
> said group?
> Mich
Neville,
Use an AOL account to access the web.
Has worked for me like a charm for two decades now even in places like China
that like to block most of the good US sites. Basically creates a VPN into the
AOL servers bypassing all the filtering.
Bye,
Said
Sent From iPhone
On Mar 24, 2014, at 2
Tom,
In my experience one of the biggest GPSDO error sources in low-cost and even
some higher end OCXOs is oscillator hysteresis. Which can change with operating
temperature, operating time (crystal age) and even over crystal tilt.
Does your OCXO model allow for hysteresis simulation?
It is ve
Gentleman,
Tom Van Baak the (co)founder of this group has kindly asked you yesterday to
stop this thread.
Please do so.
Sent From iPhone
On Feb 28, 2014, at 6:20, Didier Juges wrote:
> If you use a flash-based embedded ARM board, how much is it worth to you that
> it works everyday? How mu
Jim,
Check the archives, I am pretty sure I reported on one of them, I think it was
on the FTS-250.. Or FTS-125.
My recollection: Not that bad for the price, but phase noise and spurs on my
sample unit were significantly worse than what they show in their plots no
matter what I tried, and quit
Jim, Bob,
we just had the pleasure of doing exactly this aligned-1PPS measurement two
days ago. I had to measure the difference (noise) of two units that were locked
to the same source. To jump ahead, the difference was 0ns +/- about 500ps noise
range.
We used an HP 5335, no problem, it jumped
Sorry early morning rant,
There are counters out there already that can do 14/15 digits: tsc5125A and the
Miles box for example. Very difficult to get a reference into that counter that
can match and provide that type of stability.
I am sure Agilent would love to hear our feedback probably as l
Mike,
They are already giving you another way to calibrate the unit, different from
how you think they should have done it and you are pulling out the statist card
and accusing them of being greedy capitalists?
Come on, thats backseat driving. Be happy they invested millions of their own
money
There are two numbers that need to be specified, one is relative (back and
forth wander around some fixed offset) one is absolute (how close to the real
UTC pulse is it?).
Most of the time relative stability is given which is the first number, and one
has no idea how much unit to unit offset an
Hal,
Your plots don't show the wave being reflected by the cable end, and bouncing
back and forth.. Until settling down.
Without an end-termination the improperly terminated output of the Thunderbolt
will cause the signal to bounce back and forth..
If there is a 50 ohms termination, there won'
Anders,
I used an AD9858 years ago in our FireFox synthesizer product clocked at 1GHz
locked to the on-board 10MHz GPSDO.
I used an ADF4002 or 4000 (can't remember) pll with integer division driving a
UMC (now Sirenza) VCO. It worked very well and there where no 10MHz spurs
measurable. Its ver
John,
Too much to post here publicly :)
About one tenth of the price of the next higher available Cesium reference
though, and not much more than some used decades-old functional FTS Cesiums
selling on Ebay. Please call the office for quotes on CSAC units.
Thanks,
Said
On Nov 4, 2013, at 17:2
Bert,
Let me know if you can do stable >1s loops in the analog domain with reasonable
cap sizes say <220uF. I would be impressed. I tried.
Bye,
Said
Sent From iPhone
On Nov 3, 2013, at 14:51, ewkeh...@aol.com wrote:
> We are looking at room temperature 5 and 10 MHz XO's for cleaning up Rb and
The partial answer is: yes as they typically use 10MHz crystals too. But the
loop BW is so wide (10Hz or more) that the crystal jumps get compensated very
quickly.
We have not seen any real frequency jumps in 100's of CSACs we tested that use
vapor cells just like RB's do, so from my experience
Bob, et. al.,
Lots of opinions in this discussion, but none of it discusses the elephant in
the room affecting todays' vendors:
Random crystal instability versus manufacturing techniques.
I can buy oscillators from multiple vendors that have -115dBc at 1Hz or better
and noise floors of -182dBc
Bob,
Just my 2 cents: If you have a critical environment at work, you should
probably not be using a 10 year old $150 product with unknown origin that many
here are now reporting as failing on them and that requires multiple power
supply rails that can each fail as well.
It will likely make th
Rick,
Use three counters, a known-good reference and cross/auto-correlate?
A versus B
A versus Ref
B versus Ref
Three corner hat technique..
On A versus B you may have to pre-scale the one used as the counter reference
down to 10MHz.
Bye,
Said
Sent from my iPad
On Oct 22, 2013, at 21:59, Ri
Mark,
Thats the big difference between the 54701A and most other fet probes, its
virtually indestructible. They even designed it so it can drop directly on its
tip without internal damage.
Big difference to most other fet probes, HP even has a nice write up on their
design efforts and how they
Hi Don,
Seems the easiest would be to capture your 5370B output to a file and use
Ulrich's plotter to calculate ADEV.
With ~20ps noise floor on the 5370B you can assume a 1s indication of no better
than 2E-011.
The 10811A will be better than that assuming you did your efc low pass filter
prop
Yes, there is equipment out there today that can be used: UBlox offers jamming
detection and level. We incorporated that into the later JLT products, and even
made a special board for a customer that displays the GPS spectrum in real time
showing the jammers in the frequency domain.
Bye,
Said
Zero effect visible on the CSAC GPSDO real time plots from our lab:
http://www.jackson-labs.com/images/gpsstat.htm
Sent From iPhone
On Oct 3, 2013, at 20:56, Jim Palfreyman wrote:
> Hi all,
>
> If you go to this page: http://users.on.net/~cdadsl/ you will see some
> graphs (all in UT). Notice
Dave,
I think that is the point. Until someone spoils it and brings the Symmetricom
spec sheet and proves that wwvb watches are actually more accurate over some
months :)
Now it would have been truly impressive if they had actually taken the csac
itself apart and re-assembled it to be say half
Hi Tom,
The Jackson CSAC GPSDO solution has a vcxo-based noise filter pll on the pcb,
improving the noise performance and removing spurs as well over just the CSAC
by itself so the specs will be quite different.
In fact the LN CSAC version of that board achieves around -100dBc/Hz at one Hz,
ma
Thats correct, my opinion is obviously biased..
Here is a third party review of the unit (the Eurocan GPSTCXO version of the
same product).
http://jaunty-electronics.com/blog/2012/10/review-jackson-labs-gpstcxo-eval-board/
Hope that helps,
Said
On Sep 20, 2013, at 16:42, "John C. Westmoreland,
Bob,
Sorry, but an ADEV of 2ns/s at 1s is pretty bad drift for a GPSDO or even a
free running low cost TCXO..
I think a TCXO based unit should be in the 5E-011 to 1E-010 range and a good
OCXO unit should achieve better than 5 E-012 at 1s. Even a cheap $150
Thunderbolt can beat the latter easil
Bob,
Forgot to mention that this phase offset feature is built into the GPS
receivers themselves.
Bye,
Said
Sent From iPhone
On Sep 4, 2013, at 13:02, saidj...@aol.com wrote:
> Hi Bob,
>
> it's not +/-100ns on all receivers.
>
> Our Fury GPSDO that uses Motorola designed M12M receivers allo
Tom, John,
Wouldn't the software be able to remove any LO instability by simple cross
correlation error cancellation by all the carrier phases? After all carrier
phase measurements are concerned with relative phase delays, not absolute
offsets?
In other words the LO and ADC phase errors should
Jim,
It must have been the 223ps and 32 part per trillion spike at the end of the
plot:
http://www.jackson-labs.com/images/gpsstat.htm
:)
Sent From iPhone
On Sep 3, 2013, at 16:22, Jim Lux wrote:
> On 9/3/13 10:20 AM, Said Jackson wrote:
>> Hi guys,
>>
>> Thanks
Hi guys,
Thanks for the heads up, all should be well now. The auto-renew did not work
because we moved and they had an old CC address. Domains that expire stay
locked for 36+ days to the old owner, so no risk there..
This brings up a good point, we have had an open req for a software engineer
My bad, looking at the plot adev is in the xE-013's. thats good.
Who makes these and how much are they?
Thanks,
Said
Sent From iPhone
On Sep 2, 2013, at 10:29, Said Jackson wrote:
> Hello Steve,
>
> Nice plots. Not bad ADEV. Not quite as good as a typical BVA, but respect
Hello Steve,
Nice plots. Not bad ADEV. Not quite as good as a typical BVA, but respectable.
Who makes these and what package are they in?
Thanks,
Said
Sent From iPhone
On Sep 2, 2013, at 3:00, "Martyn Smith" wrote:
> Hello,
>
> I mentioned about there being other low Allan Dev oscillators a
1 - 100 of 228 matches
Mail list logo
