> >>At least a couple of us have the Spartan 3E board.
> > Is the ISE evaluation software time limited?
> No, but there isn't any support and it doesn't work on the big/
> expensive chips.
I got confused and/or that's misleading. Let me try again.
Xilinx has 2 basic software packages: ISE and
>>At least a couple of us have the Spartan 3E board.
> Is the ISE evaluation software time limited?
No, but there isn't any support and it doesn't work on the big/expensive
chips.
You can search their web site. Many bugs/glitches that get processed through
their support system (and are bugs r
On Sat, 06 Dec 2008 02:54:48 +1300, Bruce Griffiths
wrote:
>At least a couple of us have the Spartan 3E board.
Is the ISE evaluation software time limited?
-- kc0ukk at msosborn dot com
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To unsubscribe,
Another possible thing to try is one of the Miller integrator chips that
Tektronix used in their scopes and time base modules. I seem to remember that
at least one could yield 0.01% linearity. The 5Bxx and 7Bxx modules for the
5000 and 7000 series scopes are available in vast quantities, oft
Hi,
The LPRO manual has a circuit mistake on page 16.
The north end of R145 should go to +17V, not the resistor junction.
It may make a difference when interfacing the unit.
Seasons Greetings
Neville Michie
On 27/12/2008, at 12:06 PM, Didier wrote:
> Go to http://www.ko4bb.com/cgi-bin/search.pl
Pete
Another very useful thing to do is to measure the output noise spectrum
at the of mixer port both with capacitive termination and with a diplexer.
You can do this with your PC sound card system (even the motherboard
one) and a low noise preamp.
If you want a simple low noise preamp circuit I
Pete
Pete wrote:
> Joe,
>
> I have been following this thread from the start & learned a lot from it.
>
> Thanks to you and Bruce for the insights.
>
> I thought I would take a look at a simple, passive approach, just to
> see what happens. I also limited my attention to stable 5 or 10 MHz
> sourc
Thank you Didier! Now I just need to find out how to power the
MC598X4...
Daniel
Go to http://www.ko4bb.com/cgi-bin/search.pl
And enter lpro in the Search box
Didier KO4BB
> > -Original Message-
> > From: time-nuts-boun...@febo.com
> > [mailto:time-nut
Joe,
I have been following this thread from the start & learned a lot from it.
Thanks to you and Bruce for the insights.
I thought I would take a look at a simple, passive approach, just to
see what happens. I also limited my attention to stable 5 or 10 MHz
sources & observation windows of <100s
Bruce,
Thank You for posting a proper TAC, I'll give your circuit a try so I
improve my education in interpolator design before sharing any further
work with this list.
Richard
> Richard
>
> The attached circuit illustrates how to construct a simple high
> linearity ramp TAC.
> The circuit has
Richard
The attached circuit illustrates how to construct a simple high
linearity ramp TAC.
The circuit has been used in various guises for decades.
The latest incarnations use ultra high speed IC processes to integrate
all components on chip to minimise interconnection inductances and
achieve sub
Go to http://www.ko4bb.com/cgi-bin/search.pl
And enter lpro in the Search box
Didier KO4BB
> -Original Message-
> From: time-nuts-boun...@febo.com
> [mailto:time-nuts-boun...@febo.com] On Behalf Of Daniel Mendes
> Sent: Friday, December 26, 2008 3:04 PM
> To: time-nuts@febo.com
> Subject
If Lady Heather (Queen Mistress of the well disciplined oscillator) inserts the
leap second it WILL hurt... and you WILL like it...
-
I must have missed something... I have known about
the coming leap-second for months, but have not heard
when it was going to be inserted.
When will
Richard
Richard H McCorkle wrote:
> Bruce,
>
> Thank you for your critical evaluation of the interpolator circuitry.
> I have no doubt that further improvements to the design are possible
> and hope to inspire other amateurs on the list to come up with an
> improved interpolator design. The circui
> I must have missed something... I have known about the coming
> leap-second for months, but have not heard when it was going to be
> inserted.
They try to do it at the end of the year. Second choice is the end of June.
http://tf.nist.gov/pubs/bulletin/leapsecond.htm
For me, PST, UTC midn
Hello, Time-Nutters--
I must have missed something... I have known about
the coming leap-second for months, but have not heard
when it was going to be inserted.
When will the leap-second take place?
Will it hurt? Am I going to need a band-aid?
Or just another rum-laced egg-nog...??
Thanks!
Haven't had a chance to do that yet, but I looked at my NTP statistics
and my server driven by WWVB did lose lock earlier today, though looking
at the longer term data doesn't show any other losses in the last few
weeks. Check out http://www.febo.com/time-freq/ntp/stats/ and look for
the toe.febo.
Bruce,
At 10:16 PM + 12/23/08, time-nuts-requ...@febo.com wrote:
>
>Message: 1
>Date: Wed, 24 Dec 2008 08:47:21 +1300
>From: Bruce Griffiths
>Subject: Re: [time-nuts] Sub Pico Second Phase logger
>To: Discussion of precise time and frequency measurement
>
>
>[snip]
> >
> Us
According to the link (that Brent provided), there were WWVB outages on Dec
3, 8, 11, 12, 13, 14, 15, 17, 19, 24, 26.
I'm not sure if all those were actual outages or only loss of published data
for some other reason?
I do know that I've had a lot of WWVB tracking problems this past month.
...
You're welcome Greg. I'm glad I could post something useful to this list.
I was exploring the WWVB website last night and discovered the page that
lets you see WWVB reception in different parts of the country. For
anyone interested, here's the gateway page that lets you see reception
in Bould
Good suggestion. ...And, as an enhancement to your suggestion, the start and
stop times of the outage could be recorded to a spare computer or something.
Greg
- Original Message -
From: "Majdi S. Abbas"
To: "Discussion of precise time and frequency measurement"
Sent: Friday, December
Aha!
Thanks Brent for that link! I wasn't aware that NIST had added that feature.
Thanks again!
Greg
- Original Message -
From: "Brent Gordon"
To: "Discussion of precise time and frequency measurement"
Sent: Friday, December 26, 2008 1:19 PM
Subject: Re: [time-nuts] WWVB Outages?
On Fri, Dec 26, 2008 at 01:08:18PM -0700, Greg Burnett wrote:
> In my case, the Kinemetrics 60TF's "Unlock" alarm is *not* latching.
> Therefore you have to be there, to catch the problem "in the act". ...Or
> else run continuous plots.
You could modify the receiver and use an SCR or som
Your outage matches what NIST shows:
http://tf.nist.gov/tf-cgi/wwvbgraph_e.cgi?5482602
Brent
Tom Van Baak wrote:
> Greg,
>
> It happens now and then; no big deal. NIST is very good about
> logging these events for us. For recent (and past 7 years) see:
>
> http://tf.nist.gov/stations/wwvboutages.
Thanks for the link, Tom. That's the same link that Michael Lombardi gave me
a number of years ago. The issues I have with that NIST data is that, 1),
it's not updated in realtime, e.g., I can't see today's events; and, 2), it
only records outages lasting 5 minutes or longer. In the past few yea
John,
If it's not too much trouble, could you temporarily disconnect antenna,
confirm the alarm, then reconnect antenna to see if the alarm remains
latched or goes away.
In my case, the Kinemetrics 60TF's "Unlock" alarm is *not* latching.
Therefore you have to be there, to catch the problem "i
Greg,
It happens now and then; no big deal. NIST is very good about
logging these events for us. For recent (and past 7 years) see:
http://tf.nist.gov/stations/wwvboutages.htm
/tvb
> Have any of you noticed intermittent WWVB outages lately?
>
> I've been having that problem, every once in a wh
I don't see any alarm LEDs on my Spectracom WWVB receivers (one a
WWVB-DO, the other a clock), but I'm not sure that their "unlock" LEDs
latch, or that the "error" LEDs trip on loss of lock.
John
Greg Burnett said the following on 12/26/2008 02:50 PM:
> Have any of you noticed intermittent W
I forgot to mention: When on-the-air, WWVB produces a nice, clean signal,
at -51 dBm (at the higher of it's two shifted amplitudes) as output from my
Kinemetrics active antenna (and measured by both a HP 3586C in 20Hz BW and a
HP 3585A in 30Hz BW), here in Colorado Springs. When the WWVB signal
Hy, my name is Daniel, I lurk at this list trying to learn something
with the masters of time measurements :) I´ve bought two MC598X4 from
Ebay. Does someone have a datasheet for them? Or at least the pinouts...
I´ve bought also an Datum LPRO 102500-001 but the datasheet is no more
available at
Have any of you noticed intermittent WWVB outages lately?
I've been having that problem, every once in a while, the past month or
more. For example, here in Colorado Springs, the 60 kHz signal disappeared
sometime this morning before 11:42AM MST, and returned at 12:28PM MST. When
this happens i
Tom
The design needs some rework to achieve useful performance.
Apart from the interpolator problems, you will need to use a different
microprocessor (suitable PIC and AVR micros are available).
A microprocessor which allows the value of an internal counter to be
sampled on the transition of an ex
At 07:00 AM 12/26/2008, time-nuts-requ...@febo.com wrote:
>Send time-nuts mailing list submissions to
> time-nuts@febo.com
>
>To subscribe or unsubscribe via the World Wide Web, visit
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>or, via email, send a message with subje
Richard,
Thank you for the gift. It looks like an interesting project and worthy of
a time-nut novice like myself. I will add it to my list of 'to-do's'.
And thank you to all on the list for their very interesting discussions and
renewing my interests in electronics in the past year.
Merry Chr
Bruce Griffiths wrote:
> Richard H McCorkle wrote:
>
>> Ho Ho Ho
>>
>> Merry Christmas from the far north to all the
>> Time-Nuts. As a gift for the holidays I have
>> created a free version of the PICTIC for you
>> and Didier has kindly posted the files at:
>>
>> http://www.ko4bb.com/dokuwiki/d
Just wanted to bounce some thoughts off the group:
I have a Samsung GCRU and I need to permanently tap the 1PPS signal.
Can the PPS output of the GPS RX be used without interfering with the accuracy
of the unit?
Is there is another PPS output, preferably buffered and in phase from the GCRU?
Richard H McCorkle wrote:
> Ho Ho Ho
>
> Merry Christmas from the far north to all the
> Time-Nuts. As a gift for the holidays I have
> created a free version of the PICTIC for you
> and Didier has kindly posted the files at:
>
> http://www.ko4bb.com/dokuwiki/doku.php?id=precision_timing:pictic
>
>
Oh, she was THAT Lady Heather? ;)
Regards,
Javier
Brooke Clarke escribió:
> Hi Norman:
>
> For more on Lady Heather, see:
>
> Lady Heather's Box
> http://www.imdb.com/title/tt0534712/
>
> Melinda Clarke (related?)
> http://www.imdb.com/name/nm0164918/
>
> Have Fun,
>
> Brooke Clarke
> http://www
Ho Ho Ho
Merry Christmas from the far north to all the
Time-Nuts. As a gift for the holidays I have
created a free version of the PICTIC for you
and Didier has kindly posted the files at:
http://www.ko4bb.com/dokuwiki/doku.php?id=precision_timing:pictic
And to all a good night,
Richard
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