o
find.
Thanks to Tim also for the response and have a good weekend!
73's,
John
AJ6BC
On Fri, Oct 9, 2020, 15:24 paul swed wrote:
> John I don't think so as not sure how many have built a large antenna.
> Certainly any of the old wwvb receivers have details and thats pretty m
John had not seen this before. It is a AM decoder. But its an interesting
start if you are less than 1000 miles from wwvb.
Regards
Paul
On Mon, Oct 12, 2020 at 6:52 AM John C. Westmoreland, P.E. <
j...@westmorelandengineering.com> wrote:
> Paul,
>
> Doesn't the post by Chris
Hi
The referenced line item is $6.8 million a year. It is still very much unclear
if that is just WWV(H)
(from the reference it must include them) or if it also includes WWWVB.
Without any clarification,
we are only guessing about WWVB. Given the way the budget process works,
there’s never a
Starting 1970 I used a modified Tracor 599H on WWVB with excellent results. It
had a mechanical counter with 100 nsec, resolution. Noisy but perfect. Yes you
have to take Ionosphere sunrise and sunset in to consideration and the hourly
shift, but being a very early riser 4AM because of Europe
Hi
One would *guess* that stopping WWVB (and killing mom and pop’s “atomic
clocks”) would not be a reasonable thing to do.
It gets a lot of voters mad. I doubt that very many voters (percentage wise)
would notice WWV and WWVH going away ….
Bob
> On Aug 11, 2018, at 9:00 PM, jimlux wr
NIST is running a bluff. It may not work.
On 2018-08-20 15:39, Richard (Rick) Karlquist wrote:
It's worse than that, not just WWV, WWVH, but also WWVB:
This is an exact quote from page NIST-25 of the proposed FY2019 NIST
budget:
"NIST will discontinue the dissemination of the
will get you quite far with
> slow moving time signals like WWVB because you can average for minutes
> if you want - provided you feed the ADC a good stable clock.
>
___
time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe,
Hi Bob,
On Tue, 4 Dec 2018 16:43:57 -0500
Bob kb8tq wrote:
> The one thing the Everest chips do indeed do is demonstrate that initial
> signal
> acquisition can be done under really awful conditions. Getting the same info
> off
> of WWVB with AM only …. not so much ….At le
On 10/12/20 11:23 PM, John C. Westmoreland, P.E. wrote:
Paul,
Sure - even on my OpenHPSDR system using my vertical antenna - I am almost
able to decode WWVB (reliably) using the clock
program from:
http://f6cte.free.fr/index_anglais.htm
with no changes whatsoever. If I 'fix' t
ote:
>
> Good morning all,
>
> Universal Solder is showing the ES-100 WWVB BPSK clock kits back in stock.
> Just put me one on order. :)
>
> <https://www.universal-solder.ca/product/canaduino-application-development-kit-with-everset-es100-mod-wwvb-bpsk-atomic-clock-re
veral
years we have figured out are coded in.
One thing we did not do was automatic change from summer to winter offsets.
Its really a PIA so just not that excited when this happy switch flipper
can do it in 1 second.
The other bit of fun for the magical new DPS wwvb receiver is after you get
the bit
very simple circuit for a (microwatt) 60 kHz transmitter that
> takes a digital input (only needs someone to calculate out the WWVB code
> from a GPS clock). The biggest problem I find with my WWVB clocks is
> getting a good signal, which is highly depend on location in the house and
&
>
> > > Hello to the group.
> > > Had sometime to hook up the chronverter wwvb simulator.
> > > Numbers of details.
> > > The software and operation are clear.
> > > Everything is easy to setup.
> > > Bad news.
> > > Though the system
nd clocks
> like spectracoms and truetimes. Have not tried it on the cheapy clocks yet.
>
> I added an external modulator. A dg419 analog switch and then with a few
> resistors added DC offset and anttenuation so that the carrier drops by -14
> db per the wwvb spec. The logic co
On 12/4/18 9:00 AM, Tim Shoppa wrote:
Because of the Q of WWVB's transmit antenna (at least 300 by my back of the
envelope estimates), I don't think we could ever claim a WWVB PPS edge
sharper than 5 milliseconds and that might be optimistic.
Sure you can.. you do a matched fil
wer is adjusted:
My proposed block diagram does actually have a digital LO, only mine is
1, 0, -1, 0... (in-phase) and 0, -1, 0, 1... (quadrature). You could
of course use an variable-frequency NCO, but I need a physical
oscillator in any case to clock the MCU. I am also thinking in terms of
a WWVB-DO wh
s to be found. I've found that any type of
> glitch in the demodulated signal seems to prevent the clock chip from
> decoding the time.
>
> It's possible the difficultly with locking onto my simulated WWVB signal
> may be partially due to the design of the clock (from my locat
omputer connection, and you will what is out there,
> sweep so between 35kHz to 100kHz use one coils as antenna with a diameter of
> 2' to 3' and at least thirty turns. With that set up you will be able to see
> WWVB to. If you turn the coil's axis perpendicular to the dire
Hi Mark,
If you were able to include optional modulation for the UK's MSF
signal as well as WWVB, then I'd be very interested - especially if you
could persuade John and TAPR to produce a kit :-) Europe's DCF would also
be a good selling point, but getting its 77.5KH
On Thu, 30 Aug 2018 12:27:12 -0400
Bob kb8tq wrote:
> WWVB as transmitted ( = right at the input to the antenna) is a wonderfully
> stable signal. As soon as
> that signal hits the real world things start to degrade. Propagation between
> transmit and receive sites
> is a big d
In message <6718818b-5243-8ad1-ddbd-6115fcdb6...@earthlink.net>, jimlux writes:
>On 12/4/18 9:00 AM, Tim Shoppa wrote:
>> Because of the Q of WWVB's transmit antenna (at least 300 by my back of the
>> envelope estimates), I don't think we could ever claim
AM modulation. If you sample
and track the carrier digitally, then you get quite a bit of
processing gain due to the long integration time. My point is that
the WWVB BPSK modulation does not give (much of) an advantage
over the AM modulation because the amount of known information
is so low
As I recall, as-is these units don't work with the new WWVB signal format.
however, some enterprising person on this list has a mod for these units
that a search of the archives will discover.
-Eric
On Sun, Sep 8, 2019 at 10:03 AM bill K7WXW wrote:
> I have a stack of Spectracom 8
Hi
An antenna is pretty much an antenna so it will still work on the “new” WWVB
signal. The receiver
portion of the setup will indeed have issues with the new signal. The rest of
the setup would still
work with an alternate approach to the receiver.
Bob
> On Sep 8, 2019, at 10:55 AM, b
.universal-solder.ca/product/everset-es100-cob-wwvb-60khz-bpsk-receiver-kit-with-2-antennas/
I myself did some experimenting with a tuned loop antenna through a 60
kHz
crystal bandpass hooked to a 192k sample rate USB audio card. I can
post
process data to pull out phase shifts and time code but
kb8tq writes:
>
>> The WWVB modulation is *very* predictable. Once you have lock,
>> you can guess just about every phase reversal you will see.
>> [...]
>> The point of this being that you *could* pre-flip the data before it
>> went into a buffer. That way the buffer inte
What would the optimum bandwidth for a WWVB receiver be?
For the AM signal, there are three different symbols, 0.8 seconds on/0.2
sec off; 0.5 sec on/0.5 sec off; and 0.2 sec on, 0.8 seconds off.
This suggests to me that the two non-symmetrical symbols have strong
modulation sidebands at +/- 2.5
suggesting that the Model
404-1235UA-SS is the ONLY La Crosse clock that decodes the new
modulation. Does anyone (Tom?) have any verified information (not idle
speculation, or guesses) on this?
And another: Is anyone aware of any other commercially-available WWVB
clocks that decode the new
around the premises plus two Casio WWVB
watches. All of which missed the DST change Sunday morning. Several
picked things up Monday morning, two are still not syncing, lets see
how it goes tonight. They all are fairly reliable on the daily updates
but seem to consistantly miss the DST changes, both
I got a Trak Systems "Time Code Translator" from ebay. It's a 1U box
with large LEDs for DOY and H/M/S that translates IRIG-A to NASA-36 time
code. I plan on using the case for my WWVB clock.
Unexpectedly it has an Isotemp OCXO in it, model OCXO59-11-2, frequency
marked as
Hi
Same basic problem with WWVB. If you were using it as a reference, you timed
your
data collection to avoid the transition periods. You got both phase shifting
and the
amplitude took a dive. Neither one was going to help you make a precision
measurement.
In addition there are various
are around search d-psk-r. The difficulty depends on your distance from
WWVB there can be reasonable simple answers as others have made.
So that comes back to the question. What to do with them.
They have a really nice display and can be hacked to allow something else
to drive them. But as is, they
d is the jpg of what the signal
> looks like when it performs a 180 degree reversal. With my AWG the
> reversal always occurs at the top or the bottom of the sine wave instead
> of at the center like John Lowe shows in the WWVB document.
>
> I ordered parts from Mouser this morning t
D/A’s that will clock in the 100’s of KHz range. If you
> are only
> trying to come up with an analog of a WWVB signal the “10 bit” D/A’s found
> in
> some MCU’s would do the trick. In the setup above, the ADC would likely be
> harder to come up with than the DAC.
>
> Since
Note that WWVB is 60kHz, not 65kHz.
David N1HAC
On 10/18/20 10:35 AM, paul swed wrote:
Andre you can add layers of litz wire. You actually have litz wire? Thats
hard to find these days. But it most likely will need to be more than a few
layers. I would slip to small pieces of cardboard on both
this platform.
As far as my current setup - in the wee hours today - the WWVB signal was
coming in very strong - my HPSDR rig
using the Clock tool from Multipsk was decoding every minute - the Clock
programs' PLL was solidly locked.
I noticed for the Teensy4WWVBsdr code it appeared to be in sync
So I use a crystal controlled
> CMOS gate oscillator to generate the RF.
>
>
> Andy Backus
>
> WA2TND
>
>
>
> From: time-nuts on behalf of paul swed
>
> Sent: Saturday, October 27, 2018 4:01 PM
> To: Time-nuts
> Subject: R
to remain a sub time-nuts piece of hardware.
Chris
-Original Message-
From: time-nuts On Behalf Of Tom Van Baak
Sent: Thursday, August 20, 2020 22:59
To: time-nuts@lists.febo.com
Subject: Re: [time-nuts] WWVB SDR discussion
Mike,
I've used that seller a lot; no worries. They hav
through a floor and
marbel kitchen counter top. The antenna touches some metal pipes at points.
But the WWVB clocks lock up very quickly. As a guess the system may be at
the 30 uv level.
May try switching to a coax feed. Not as close to the antenna but see what
it does.
wwvb version 2.0 works. Last step
ce project.
Cheers
Detlef Schücker
"time-nuts" schrieb am 22.07.2020
18:44:08:
> Von: "Mark Haun"
> An: time-nuts@lists.febo.com
> Datum: 22.07.2020 19:29
> Betreff: Re: [time-nuts] WWVB PM Time Questions
> Gesendet von: "time-nuts"
>
> Hi
er several
> years we have figured out are coded in.
> One thing we did not do was automatic change from summer to winter offsets.
> Its really a PIA so just not that excited when this happy switch flipper
> can do it in 1 second.
>
> The other bit of fun for the magical new DPS wwvb r
I've had some luck improving things with my ATTiny85-based WWVB Simulator
design by replacing the crappy, 8 MHz internal oscillator with an 8 MHz
crystal and removing the tweaked timer values I had previously used. In
addition, based on a suggestion from Paul Swed, I tried looping the an
e a good weekend!
>
> 73's,
> John
> AJ6BC
>
> On Fri, Oct 9, 2020, 15:24 paul swed wrote:
>
>> John I don't think so as not sure how many have built a large antenna.
>> Certainly any of the old wwvb receivers have details and thats pretty much
>
John really appreciate the pointer. Though it doesn't help wwvb BPSK its a
really good intro to SDR and DSP super simple. A good way to get your feet
wet. Hmmm is there a parts order soon? :-)
Regards
Paul
WB8TSL
On Mon, Oct 12, 2020 at 10:33 AM Bob kb8tq wrote:
> Hi
>
> The “
e carrier tracking loop, for a simple WWVB disciplined oscillator.
I also have some questions about the NIST document, but in general, I
think you need to assume that your receiver is already locked, in which
case you know when to expect the transitions. Getting to this point
(acquisition) is anothe
I encountered an interesting presentation from NIST, ``GPS Time Backup
for Power Industry''
(https://www.naspi.org/sites/default/files/2017-03/nist_lowe_gps_time_backup_power_industry_20170322.pdf)
(supposedly from '17) on a proposed GPS fallback solution (Radio KNIT)
based on WW
HF propagation of WWV or WWVH is horrible compared to VLF propagation
of WWVB at 60 kc. In this video the 5 mc WWV signal from Ft Collins,
Colorado is being received in New Jersey. It was compared against a
stable 5mc crystal source. You can see a shift of a few cycles per
second over a few
; In message <63462681-f5d7-0282-ef5b-82e8332d0...@dartmouth.edu>, "David G.
> McGaw" writes:
>
>> BTW, I have been told it has also been successfully tested for lock in
>> Brazil. Is there anyone in Australia want to give it a try? Perth is
>> almost di
gt;, jimlux writes:
I'm going to bet that the 8 bit RTL-SDR isn't going to work on 60kHz.
I don't know about the RTL-SDR, but 8 bits will get you quite far with
slow moving time signals like WWVB because you can average for minutes
if you want - provided you feed t
measurement
; Bob kb8tq
Subject: Re: [time-nuts] new WWVB BPSK dev board
>We’ve been chatting about how drop dead simple it is to spend a couple
>minutes and come up with a SDR for the new modulation for …. ummm …..
>errr …. how many years now? :) So far not a lot has turned
high resolution would come
from tracking a specific point on the amplitude trailing edge (say, the 90%
point).
Another interesting aspect of the WWVB recordings is that the constellation
diagram shows some brief, large phase excursions during amplitude changes.
Phase accuracy is pretty good steady-st
oring frequency or drift of an oscillator by comparing
it the 60 KHz WWVB carrier through the filter would show frequency and phase
shifts due to the thermal shifts. That would result in false indications
of drift and instability and certainly cause issues with anything that
depended on deriving exact
t;
>> I really wish NIST didn't add the BPSK modulation to WWVB. Increasing
>> the transmitter power would have been a lot better, but I'm sure that
>> would have cost a lot more then just changing the modulation.
>
> One does not simply increase the trans
amp;_cview=0
>
> The public comments should be around someplace.
>
> Larry Sampas
>
> On Fri, Aug 10, 2018 at 5:05 PM, Andy Backus wrote:
>
> > I have a very simple circuit for a (microwatt) 60 kHz transmitter that
> > takes a digital input (only needs someone to ca
hat
> > > should be easy to fix and that he would want to fix.
> > >
> > > Didier KO4BB
> > >
> > > On Thu, Aug 23, 2018, 8:55 PM paul swed wrote:
> > >
> > > > Hello to the group.
> > > > Had sometime to hook up the chronv
like to look into
> > that
> > > myself.
> > >
> > > Dana
> > >
> > >
> > > On Thu, Aug 23, 2018 at 9:00 PM Didier Juges
> wrote:
> > >
> > > > Have you tried to contact the manufacturer? It sounds like
I started using WWVB in 1970 in Houston working for TI using a Tracor Omega
receiver. Modified it for 60 KHz and used it for 40 years. TI liked what I did
and I modified quite a few for their Cal Labs in the US and Europe. Got a award
and could keep all the extras. In those days TI was still
Try receiving wwv or wwvb with your HP3586 SLV and determine precisely
where f(o) is.
It's difficult, ...as propagation and atmospheric conditions will
unwittingly prevail.
This ham prefers my gpsdo's, or my cesium.
Don
N5CID
==
there's a new model coming; who knows.
And, yes, this is a deal for $35. They are so much better than older
WWVB clocks. AFAIK it is still the only LF radio clock that uses the new
eWWVB PM format. The smaller clocks and watches all use the legacy WWVB
AM format.
/tvb
[1] https://www.la
gt; years we have figured out are coded in.
>> One thing we did not do was automatic change from summer to winter offsets.
>> Its really a PIA so just not that excited when this happy switch flipper
>> can do it in 1 second.
>>
>> The other bit of fun for the magical
o good for wristwatches, where the expectation
is to
run at uW power levels. I for one would be very irritated at having to
take my watch
off my wrist and put it on a charging stand every night. So if this
shutdown comes
to pass, I'll be looking for an inexpensive GPS-to-WWVB converter, or
Cutting WWVB the public has to ask why a NIST Tme and Frequency Division has to
exist. Fighting with other countries as to who has the best precise frequency
source will not go well with the public when clocks, school zone lights and
watches quit working.
Remember what happened in Japan when
ehicle for the higher frequencies.
> But it's extremely hard to make a jammer for WWVB (60 kHz) where a
> 1/4wavelength is over 4,000 feet. This means an antenna that can be
> vehicle mounted will be very inefficient. Note this also means that it's
> extremely hard to make a
On 4/7/19 4:30 AM, Wayne Holder wrote:
Hi Wayne,
Great to see you found my presentation!
The paper is available here:
https://www.kevincroissant.com/WWVB/WWVB_PTTI_2018_paper.pdf
Kevin, thanks for the link to the paper. I'd like to know more about how
correlation works and how you were
Feher, N4FS
89 Arnold Blvd.
Howell NJ 07731
848-245-9115
-Original Message-
From: time-nuts On Behalf Of Tom Van Baak
Sent: Tuesday, August 11, 2020 6:45 AM
To: time-nuts@lists.febo.com
Subject: Re: [time-nuts] WWVB SDR discussion
Ray,
I don't see a crystal filter. The
Wayne very good progress. You can actually feed the loop coild that exists
with the cap it should resonate.
Thats my plan at least.
Regards
Paul
WB8TSL
On Thu, Aug 30, 2018 at 9:44 PM, Wayne Holder
wrote:
> I've had some luck improving things with my ATTiny85-based WWVB Simulator
>
:27 PM, Bob kb8tq wrote:
Hi
WWVB as transmitted ( = right at the input to the antenna) is a wonderfully
stable signal. As soon as
that signal hits the real world things start to degrade. Propagation between
transmit and receive sites
is a big deal, even at 60 KHz. On top of that, there is a *lot
. Its given me a heck of a time. Just trying
to get the bootloader going and then the simple blink program. I have not
worked on it in a bit as other things have cropped up.
Regards
Paul.
On Tue, Jul 21, 2020 at 8:47 PM wrote:
> I want to decode the WWVB time information using the BPSK informat
as I recall 30% up the envelope.
Humor on the d-psk-r. The new unit does not have an output that contains
the phase shifts of wwvb. The units intention is to remove all phase shifts
so that all old style phase tracking receivers and clocks work. They all
do. Have 7 of them.
So to experiment with
s as I recall 30% up the envelope.
>
> Humor on the d-psk-r. The new unit does not have an output that contains
> the phase shifts of wwvb. The units intention is to remove all phase shifts
> so that all old style phase tracking receivers and clocks work. They all
> do. Have 7 of them.
>
dB of
gain assuming a WWVB signal of 100 uV. I used 620 ohm resistors to drive
the MC34151 pins 10 and 15 which should be plenty of drive.
If I do a 5 second capture of the output from pin 1, I see the phase
reversals. The reversals are not always on the zero crossing point of
the wave. That is
-Original Message-
From: time-nuts On Behalf Of Tom Van Baak
Sent: Thursday, August 20, 2020 11:59 PM
To: time-nuts@lists.febo.com
Subject: Re: [time-nuts] WWVB SDR discussion
Mike,
I've used that seller a lot; no worries. They have 800+ items for sale, mostly
clock and weather produc
readout or are you after something that
gives you an electrical signal (like a PPS)?
Is DIY ok in this application? If so, there are a lot of TCXO’s out there that
will do at least as well as what you are looking for. A very different approach
would be a GPS (or WWVB) module with a battery attached to
John W:
Regarding your Teensy WWVB receiver display issues.
The Teensy does not have a source termination resistor on the SPI clock.
Add a 50 Ohm resistor (value not critical, anything from 33 to 75 will
work) in series with the SPI Clock signal, as physically close to the
Teensy as practical
dust settles, all may be well. . .
> Don
>
>
>> On 2018-08-12 12:20, paul swed wrote:
>> Like all of you I have a few wwvb clocks that work pretty well here in
>> Boston.
>> Certainly have written enough wwvb stuff and created various wwvb
>> projects
>>
clock they are about 99% positive.
A lot of reviews say their clocks based on the AM modulation method
would not sync but the phase modulation ones always work.
Ray,
AB7HE
Original Message
Subject: Re: [time-nuts] WWVB PM Time Questions
From: paul swed
Date: Thu, July 30, 2
Hello Time Nuts,
Thanks Graham - I will check that - sounds like it's something I'll do.
Paul - you're off to a good start - I will probably order that as well.
I did get my set up to decode WWVB somewhat reliably - or maybe it was just
good conditions in the last 24 hrs:
WWVB-D
identifying individual edges. The WWVB signal really was
never
set up for this. Loran-C is an example of a signal that was designed to
identify a specific
edge.
Bob
> On Aug 31, 2018, at 10:30 AM, Martin VE3OAT wrote:
>
> But the diurnal phase shifts at VLF are predictable and largely r
On 11/20/18 1:54 AM, ew via time-nuts wrote:
Starting 1970 I used a modified Tracor 599H on WWVB with excellent results. It
had a mechanical counter with 100 nsec, resolution. Noisy but perfect. Yes you
have to take Ionosphere sunrise and sunset in to consideration and the hourly
shift, but
nal you can guess quite a few bits
of the next minute. But this gives at best 60 bits per minute of
information for the BPSK correlator. Compare this to 512 bits per _second_
of DCF77. Ie DCF77 has 500 times more information to work with and
to pull the signal out of the noise than WWVB.
Or to
t: Re: [time-nuts] WWVB PM Time Questions
From: paul swed
Date: Thu, July 30, 2020 5:14 pm
To: Discussion of precise time and frequency measurement
Ray
Are you speaking to the d-psk-r software? Its quite a bit more involved
than what you mentioned. Its in the coding sequence. But could it be put
uency for AM range?
> Surely not a tuning diode like MV1404 as these are incredibly expen$ive.
> Was wondering about pulling the rod and modifying it for WWVB as my
> existing radio clock
> works and it would be a shame to mess that up.
> Should be easy enough as I have (somewhere!)
With any luck, the current administration will successfully push the USA down
technically. Denying global warming, shutting off time signals, and so on, is
great stuff.
On Saturday, August 11, 2018, 6:10:12 PM PDT, Bob kb8tq
wrote:
Hi
One would *guess* that stopping WWVB (and
Does any one know what the line item $$$ amount is for the WWV/WWVB
operating budget?
-DC
NR1DX
manu...@artekmanuals.com
On 9/1/2018 11:59 PM, Peter Laws wrote:
On Sat, Sep 1, 2018 at 7:25 PM Bob kb8tq wrote:
I most certainly *have* seen an NTP server that ran off of WWVB and relayed
the
In message <20181204222100.293dc3259cf1d8683daec...@kinali.ch>, Attila Kinali
writes:
>BPSK by itself does not improve timing. At most it improves reception
>by having a constant power envelope. But in case of WWVB, where
>the AM modulation is still kept, this is not the
between the 2
Also Looking for a rabid
Best regards Paul
-Original Message-
From: time-nuts [mailto:time-nuts-boun...@lists.febo.com] On Behalf Of
gandalfg8--- via time-nuts
Sent: 04 December 2018 12:12
To: time-nuts@lists.febo.com
Cc: gandal...@aol.com
Subject: [time-nuts] new WWVB
-October 2 on the WWV/WWVB transmitter property in north
Fort Collins.
Note that the WWV/WWVB transmitter site does not do tours often, so if
you've never visited the site, this might be a good time to check it
out, especially since the station seems to get put on the chopping block
Paul, thanks for the suggestions. The top of the minute is a good idea.
Since the first second is part of the sync pattern it will always be 0
and the phase would be 0. A differential opamp with one input from WWVB
and the other from the local source fed to the STM32 would tell if the
signals were
online has such dark photos / low resolution that i cannot make out what items
are. I’m currently doing the modification to the unit to account for the new
WWVB modulation scheme, though I haven’t got it working quite yet. I am
working on a (hopefully) more efficient antenna for it.
I looked through
On 10/12/20 7:40 AM, paul swed wrote:
John really appreciate the pointer. Though it doesn't help wwvb BPSK its a
really good intro to SDR and DSP super simple. A good way to get your feet
wet. Hmmm is there a parts order soon? :-)
Regards
Paul
WB8TSL
And the teensy has plenty of spac
nd then with a few
> > resistors added DC offset and anttenuation so that the carrier drops by
> -14
> > db per the wwvb spec. The logic control is driven from the chronverter
> and
> > it totally works. Spectracom Netclock 2 locked up in the normal time.
> >
r in these
clocks).
> Can be placed in any location in the house or garage and even the basement.
> Interestingly without the real wwvb I can orient them any way I want
> also.
That's some indication that your transmitter may have more power or your
general reception of the real WW
From a signal processing point of view this problem interests me, so I
wanted to float an idea.
If I read the WWVB document correctly, the phase shifts are always going to
be +/-180° out of phase, but still the exact same frequency. It would
stand to reason that if one wanted to detect this
Hi
Backing up a bit …..
The WWVB modulation is *very* predictable. Once you have lock,
you can guess just about every phase reversal you will see. If you
have an “approximate lock” ( = a time pre-load that is within a few
seconds) you can guess a lot of them. (There were a few aux data bits
the reality is if the
flips not exact the phase tracking receivers work just fine.
But beyond the simple reading of the nema sentence its the magical
conversion to the new wwvb message format thats quite difficult. Then they
turned on teh slow code and Rodger and I worked that issue. That actually
wwvb. But at least direct
alternatives exist. I am fortunate to be able to actually measure radiated
levels very accurately so will respect the allowed emission levels.
Regards
Paul
WB8TSL
On Mon, Sep 10, 2018 at 4:14 PM, Achim Gratz wrote:
> paul swed writes:
> > Indeed anything could b
> If you read the online reviews of the clock they are about 99% positive.
> A lot of reviews say their clocks based on the AM modulation method
> would not sync but the phase modulation ones always work.
>
> Ray,
> AB7HE
>
> Original Message
> Subjec
e:
> Wayne very good progress. You can actually feed the loop coild that exists
> with the cap it should resonate.
> Thats my plan at least.
> Regards
> Paul
> WB8TSL
>
> On Thu, Aug 30, 2018 at 9:44 PM, Wayne Holder
> wrote:
>
> > I've had some luck improv
e's.
>
>
> When WWVB blinks off my plan is to have a single GPS receiver in the house
> with a good antenna and to distribute from it a digital signal that will
> key little 60 kHz units for each clock.
>
>
> Attached is source code (well commented) for an Adafruit GPS modu
gt;
> NIST is running a bluff. It may not work.
>
>> On 2018-08-20 15:39, Richard (Rick) Karlquist wrote:
>> It's worse than that, not just WWV, WWVH, but also WWVB:
>> This is an exact quote from page NIST-25 of the proposed FY2019 NIST budget:
>>
>> &q
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