here is a description how a receiver works for a time signal with very
similar modulation
http://caxapa.ru/thumbs/417284/Engeler_DCF77.pdf
73
KJ6UHN
On 5/31/2014 2:23 PM, paul swed wrote:
I had reached out several times to the new wwvb chip maker for this
timecode.
And though first run chips we
I posted here some days ago an admission that I did exactly this by
accident once. It is a very hard problem to debug because everything works
just fine, except for the very high jitter. So I go looking for noise and
what not.The problem was a wrong number of inverters.
On Sat, May 31, 201
Hello,
The UT_Eng_Notes file I have (for the UT, not the UT+) specify:
1PPS Signal Description
. 0 to 5 V pulse
. Pulse accuracy:
- Normal mode: < 130 ns (one sigma) with SA on
- Position-hold mode: < 50 ns (one sigma) with SA on
. Rise time from 0 to 5 V is approximately 20 to
Hi
The price of the spin isn’t just the cost of the masks. There’s a non-trivial
cost involved in the redesign of the chip and the testing that finds the
problem.
You can indeed do a project run for $5,000 and get usable chips. The same
process moved to a single wafer also can give you a few
On 5/31/14, 5:48 PM, Bob Camp wrote:
Hi
A thousand chips at $1 a chip is a very different thing than a thousand chips
at $100 a chip. The next issue might be that they only have them in die form.
The issue after that probably is that you really want the version 3 (or 9)
chips that actually wo
Hi
A thousand chips at $1 a chip is a very different thing than a thousand chips
at $100 a chip. The next issue might be that they only have them in die form.
The issue after that probably is that you really want the version 3 (or 9)
chips that actually work with all the modulation schemes. I’v
At 04:23 PM 5/31/2014, paul swed wrote:
And though first run chips were available they are not to us unless we want
1000 of them. Also pricing is unclear.
If they don't have distribution set up yet, I can understand 1k min
orders...but no samples?
That said yes the intent is to receive tim
I had reached out several times to the new wwvb chip maker for this
timecode.
And though first run chips were available they are not to us unless we want
1000 of them. Also pricing is unclear.
That said yes the intent is to receive time. The new chip doesn't easily
allow a way to d-psk the signal.
Check rising/falling edge times, check trigger levels, check signal levels and
load. Are you DC or AC coupled. How about power supply noise and grounding?
Which edge are you actually triggering on? Is there crosstalk with the Tx line.
It is extremely unlikely that there's a problem with the UT+
Picked this project back up this afternoon after couple of weeks, narrowed the
problem down but not solved.
Refresh: My ONCORE UT+ module appears to have very extreme jitter (on on order
of 100 uSec, not nSec random variation between leading edges of successive
pulses) in the 1 PPS output. I a
Hi
We are in a “brave new world” of industry / government interaction. Watching
how it plays out with WWVB (through real product) probably will provide a
number of people with research topics for years to come. Yes it’s frustrating,
a lot of it is as new to them as it is to us. I’m willing to c
I have been able to consistently receive the WWVB phase-modulated data of
what is now being referred to as "Normal Mode" since last summer, using an
air-wound coil antenna, multiple op-amp front end, and a PIC
microcontroller setup that I originally used for receiving the
amplitude-modulated signal
Hi:
What are the left two digits telling us?
http://www.nist.gov/pml/div688/wwvb-030513.cfm
I've emailed John Lowe & James Burrus the above question and for more information about the different transmission modes
as well as more information about the hardware shown on the above web page.
--
H
Hi
They tested the modulation format they now are using back in 2013. If they also
tested the other formats that was done for a very brief period of time. I would
think that knowing the transmission schedule of the various formats would be an
important input into the chip’s design. More or less
At 08:01 AM 5/31/2014, Bob Camp wrote:
Hi
Well that's a bit more information. We seem to be missing the
deployment schedule on the other new modulation formats. I kind of
doubt that the watch and clock guys are going to start the fabs
turning out millions of chips until they can test all the
On Fri, May 30, 2014 at 3:24 PM, Poul-Henning Kamp wrote:
> Always locate your DUTs physically orthogonal to each other.
Good point. Of course, if you have more than three in an ensemble
then the ensuing hyperdimensional vortex may also cause unexpected
cross-coupling.
Henry
___
and here is a more detailed description of a similar signal's
demodulation: http://caxapa.ru/thumbs/417284/Engeler_DCF77.pdf
On 5/31/2014 1:03 AM, David I. Emery wrote:
Well the actual details of the WWVB modulation and time
codes are now published.
Was just leafing through som
Hi
I’d say it is a safe bet that they will fiddle the way they do the various
modulation formats so that the WWVB wrist watches keep working. It will be
interesting to see how they do that with the “fast” modulation. I both want my
watch to work and I’d like to see the fast stuff on the air for
Wonder what the consequences to my Junghans watch will be? - Regards - Mike
Mike B. Feher, EOZ Inc.
89 Arnold Blvd.
Howell, NJ, 07731
732-886-5960 office
908-902-3831 cell
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Tom Van Baak (
will also look better than it really is, and for the same reasons. (Some
people have even reported similar behavior with cesium standards,
although I
don't see how that could happen. There aren't supposed to be any
first-order temperature effects in a CBT, and I'd think that any
lower-order
ef
Hi
Well that’s a bit more information. We seem to be missing the deployment
schedule on the other new modulation formats. I kind of doubt that the watch
and clock guys are going to start the fabs turning out millions of chips until
they can test all the formats.
…… the 100 bps signals looks i
In message <5389a141.7050...@rubidium.dyndns.org>, Magnus Danielson writes:
>Yeah, there is a whole bunch of environmental effects there. I haven't
>mentioned the Stark effect, which is the electrostatic field effect.
>See, the list grows longer.
>
>The closer you look, the more effects you will
On 05/31/2014 12:24 AM, Poul-Henning Kamp wrote:
In message <013401cf7c46$31ac3cc0$9504b640$@miles.io>, "John Miles" writes:
(Some
people have even reported similar behavior with cesium standards, although I
don't see how that could happen. There aren't supposed to be any
first-order tempera
John,
On 05/30/2014 10:31 PM, John Miles wrote:
I usually don't use drift removal as I want to see the effects of drift!
The effects of oscillators locking together are very apparent on both the
phase and AD plots when using a DMTD system. There was no indications of
such locking!
My point wa
http://tf.boulder.nist.gov/general/pdf/2719.pdf
/tvb (i5s)
> On May 31, 2014, at 1:03 AM, "David I. Emery" wrote:
>
>Well the actual details of the WWVB modulation and time
> codes are now published.
>
>Was just leafing through some journals while doing some
> boring system configurati
Well the actual details of the WWVB modulation and time
codes are now published.
Was just leafing through some journals while doing some
boring system configuration here...
IEEE Communications Magazine May 2014 has a paper on page 210
by Yingsi Liang, Oren Eliezer, Dinesh
> Always locate your DUTs physically orthogonal to each other.
Unless you have 3 clocks. (and everybody knows what happens if you only have
2)
>From an old time-nuts message (Mar, 2009)
> Allied to this discussion is the Loomis effect, discovered by the
> American millionaire who had three S
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