; other
> > approaches.
> >
> > ==
> >
> > There are a lot of 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’
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. There is
er observe the
> > phase reversal. I could see the reversal at 60 kHz but could not capture
> > it for a single sequence photo. Attached 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
: [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
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
> orientation of the devi
Group,
This subject needs some additional detail. I found an article with comments at
https://swling.com/blog/2018/08/nist-fy2019-budget-includes-request-to-shutdown-wwv-and-wwvh/
It is not clear whether WWVB will still be available for all of our cheap
"atomic" clocks.
One co
hould 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 chronverter wwvb simulator
ke9h.gra...@gmail.com said:
> If both the HF and LF signals go away due to the proposed budget cuts, what
> is the next simplest way (for something like a microprocessor based clock) to
> get DST information?
"microprocessor" isn't a well defined term.
If you have an OS, use the time
Good Idea, John.
I'll do that.
Just to see what they say.
--- Graham
==
On Fri, Aug 24, 2018 at 1:25 PM John Marvin wrote:
>
> Someone suggested scraping the NIST time service website for this
> information. The NIST website specifically says "Also, it is
> inappropriate to generate your own
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 logi
en 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.
> > There
I hope that those of you who write code to generate the WWVB signals in real
time from a GPS receiver's output will publish well documented source
listings.
I for one want to learn how one does this kind of thing in 'C', both for
general
interest and for this specific application.
Thanks,
Dana
, something that you can
hold in your hand.
It's harder to make a WWV jammer (.5, 5, 10, 15, 20 MHz) since a 1/4 wavelength in in the range of 500 to 12 feet,
something that can be mounted on a vehicle for the higher frequencies.
But it's extremely hard to make a jammer for WWVB (60 kHz) where a 1
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
=
On Sat
andrewbac...@msn.com said:
> Also -- when the GlobalTop loses a fix it still puts out the RMC sentence,
> just without the lat and lon data. And the PPS immediately stops. I
> designed the parsing scheme to account for that. How long that reporting
> would continue I don't know.
The RMC
).
> 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 WWVB is better than yo
slides ( which some
other vendors seem
to want you to do).
Bob
> On Aug 29, 2018, at 4:55 AM, Dana Whitlow wrote:
>
> I hope that those of you who write code to generate the WWVB signals in real
> time from a GPS receiver's output will publish well documented source
> listings
For those that have asked for my to publish the source code for my
ATTiny85-based WWVB simulator, I have put up a somewhat hurriedly written
page on my google site at:
https://sites.google.com/site/wayneholder/controlling-time
that describes a bit about how the code works, how to compile
Hi Wayne:
DST.
GPS has no bits for Daylight Savings. As far as I know only WWV and WWVB have
those bits.
So for a clock displaying local time WWVB is the way to go.
--
Have Fun,
Brooke Clarke
https://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
axioms:
1. The extent
Jan 1, 2019 at 4:05 PM Hal Murray wrote:
>
>>> GPS has no bits for Daylight Savings. As far as I know only WWV and WWVB
>>> have those bits. So for a clock displaying local time WWVB is the way to
>> go.
>>
>> WWVB's DST data is targeted at the US.
>>
>&
In message
, Tim
Shoppa writes:
>I don't see any sawtooth or other weird stuff going on in the residual.
I don't think you would be able to detect a sawtooth, even if it were there,
with a pulse-per-minute signal between two bare X-tals ?
--
Poul-Henning Kamp | UNIX since
In message
,
"John Moran, Scawby Design"
writes:
>I think I will get distracted over Christmas sketching out some designs ...
Grab som I+Q samples from a kiwisdr somewhere and start playing with
signals instead.
If you like it, start making hardware.
--
Poul-Henning Kamp |
Hi Paul,
It was shifted over 11 years ago, very obligingly timed to follow my move from
the South East to Scotland:-),
so I suspect any resulting propogational changes would have been well
documented by now.
Nigel GM8PZR
Hi thank you Bob for the mail
Do you realise the 60 Khz
On 12/4/2018 6:29 PM, Gilles Clement wrote:
Hi,
In France the carrier frequency is 162khz (Allouis)
Phase modulated over one minute.
Gilles.
Interesting: isn't 162 kHz within the European
Long Wave Broadcast Band? Wouldn't there be a
problem with QRM from these megawatt stations?
Excuse the
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 filter
As was said, IRQ delay is +/-100 mS from the second edge, hardly what a
Time-Nut is looking for.
David
On 12/4/18 1:07 PM, Hal Murray wrote:
>> The one thing I wish is that there were access to the synchronized analog
>> signal and/or a 1PPS. Even a top of the minute would be useful. It
>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 up.
All I can say is that people dont know what they're missing ;-)
--
I also ordered one of the EverSet Dev Boards.
Pricey for a one IC "glop-top" package, but I would like to see how it
performs.
But, I could not duplicate quantity one for the price, either.
I also note that they sold out about mid day yesterday, so Tom's
announcement cleaned them out.
As far as
On 12/5/18 4:36 PM, Poul-Henning Kamp wrote:
Johns sample-rate appears to be almost 1000PPM fast and
drifting, it it is trivial to adjust the "do" to keep either
the ali or alq haunting zero.
Yes, I should have mentioned that the Red Pitaya does not have a
reasonable way to run with external
gt;>
>> I entered the frequency of 60Khz and am curious to know if this the WWVB
>> transmission I am hearing or something else?
> No, that is the UK Rugby transmitter.
>
> For SDR transmitters all over the world, mainly John's KiwiSDR, visit
> http://sdr.hu
>
The MSF
gt;>
>> I entered the frequency of 60Khz and am curious to know if this the WWVB
>> transmission I am hearing or something else?
> No, that is the UK Rugby transmitter.
>
> For SDR transmitters all over the world, mainly John's KiwiSDR, visit
> http://sdr.hu
>
The MSF
Interestingly enough, compared to my initial testing last winter, my ES100
is suddenly much more likely to acquire and track WWVB in broad daylight.
This morning it is acquiring from a cold start almost every time.
(The "bad minutes" of course still don't work).
Most likely reason wou
I have a stack of Spectracom 8170 WWVB synchronized clock boxes, along
with the matching antenna and preamp and an RS232 distribution box. I
found a little documentation for the antenna and preamp but little else.
Wondering if anyone here has any ideas how I might re-purpose them.
They have
requency of 60Khz and am curious to know if this the WWVB
> transmission I am hearing or something else?
>
>
> Donald Resor
> N6KAW
>
>
> ___
> time-nuts mailing list -- time-nuts@lists.febo.com
> To unsubscribe
In message
,
"D. Resor" writes:
>>From another list I was directed to this link for those who do not have a
>shortwave radio.
>
>http://websdr.ewi.utwente.nl:8901/
>
>I entered the frequency of 60Khz and am curious to know if this the WWVB
>transmiss
gt; > have a
> > shortwave radio.
> >
> > http://websdr.ewi.utwente.nl:8901/
> >
> > I entered the frequency of 60Khz and am curious to know if this the WWVB
> > transmission I am hearing or something else?
>
> No, that is the UK Rugby transmitter.
>
> For SDR tr
Regarding analog clocks, what is the groups opinion on these Atomic WWVB Signal
Radio Controlled Clock Movements?
I ordered one from China but it isn't here yet. I am hoping that I won't have
to change the clock for DST. They are only $15.
https://www.klockit.com
https://www.amazon.com/dp
if you still have gear and want to warm it up for checking frequency
here is your chance.
I already know I need to replace a 20' section of a 164' line of RG6 from a
squirrel attack. Just replaced 140' of a 174' line due to the same for WWVB.
Fortunately thats quite easy to do. Wonder if the pre-amps
ndard" which in great
detail he walked through building a WWVB receiver/comparator. He was a
brilliant builder and hardly owned a single piece of amateur radio equipment
that he didn't build from scratch, or modify.
http://www.mossfuneral.com/obituaries/details/2589/Regards,Chris Farl
dentification for WWVB and
> also served as a marker for chart recorders. The shift occurred from
> 10-minutes past the hour until 15 minutes past the hour.
>
> Before GPS came along, WWVB was my main frequency
> standard/reference. I had two Gertsch RLF devices and a "thumper"
(through attenuators) the WWVB signal is clearly visible. I'm now trying
> to figure out how to detect the phase shift so I can get the time data
> for my CPU to process and send to a display.
>
> I already have a GPS based clock that I built so I thought the WWVB
> phase clock woul
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
of the
time. It just depends on propagation.
In New England the antenna does need the ability to null MSF out of
England. A bit of a trade off.
Last comment. Listening today and really seeing the noise floor upto 70-80
KHz climbing. Still tracking wwvb just fine but I fear far sooner then
later that may
> differential first op amp followed by 5 stages of op amp filtering and
> amplification. When the last stage is fed to my spectrum analyzer
> (through attenuators) the WWVB signal is clearly visible. I'm now trying
> to figure out how to detect the phase shift so I can get the time d
For my little WWVB project I used the table saw to cut off the
upper 3 inches of a 5 gal bucket from Lowes (having removed the handle
first).
Then I wrapped that with about 30 turns of enameled wire from
an old TV flyback transformer. I then measured the inductance
and added the required
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.lacrossetechnology.com/
[2
usted:
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 where I want
On Tuesday, August 11, 2020, 07:14:12 PM EDT, Bob kb8tq wrote:
> The problem with the crystal is that it has a temperature coefficient. As a
> narrow band filter, it will have a *lot* of delay. Crystal resonance moves
> (with temperature) and the delay changes.
I agree. The crystal needs to be
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
Bob kb8tq writes:
> It also *very* much depends on the stability of your local reference and the
> stability of the ionosphere. Unless both are 'pretty darn good' a hundred
> second
> integration is utter nonsense
This is why Loran-C was so superior to any and all CW based
plt.subplots(figsize=(15, 3))
ax = plt.subplot(1,1,1)
plt.title('WWVB Phase5 - 70 sec')
ax.plot(phase_deg.clip(-120, 120), lw=0.4)
plt.xlim(6, 71)
plt.ylim(-150, 150)
ax.fill_between(phase_deg.index,
0,
phase_deg.clip(-120, 120), where=phase_deg>
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
Ray,
> How do the La Crosse distributors sell the ULTRATOMIC clock for $35-$40.
That's a bit lower than a few years ago when it first came out.
> Building a million clocks would get the cost down,
In this case, likely thousands not millions. The market for WWVB clocks
took a hit in th
with 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 with WWVB
Got a mobile phone with a speaker?
There are "emulator" software apps which generate the appropriate time signals
(e.g. 60 KHz WWVB) as harmonics of sounds emitted through mobile phone speakers:
iPhone/iPad:
ihttps://apps.apple.com/us/app/clock-wave/id1073576068
Andro
On Tue, May 31, 2022 at 1:30 PM Dave via time-nuts
wrote:
>
> Excuse my ignorance but what is CHU ??? Is it like MSF ??
Yes and no. More akin to WWV in that it transmits on HF (MSF is only
60 kHz like WWVB, yes?)
https://nrc.canada.ca/en/certifications-evaluations-standards/canadas-of
d as
long as the clock is with 2 inches of the ferrite rod. I'm using the WWVB
receiver module in another experiment, so I don't want to risk damaging the
module by applying a 5 volt PVM signal to the coil. But, I have a another
WWVB receiver module on order so, once it arrives, I'll try out your
s
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 location it's
never been able to to lock onto the real WWVB signal), but I have no
reference to compare it against so, for now, I have conclude
Hello to the group. The Chronverter is now available again. US $37.
Its from unusual electronics as was mentioned earlier in the thread.
No matter how 2019 actually goes its a good way to keep the wwvb clocks
going.
Saves me from having to create the same thing.
Regards
Paul
WB8TSL
On Mon, Aug 13
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
because I can already see some changes I
would like to do.
But all in all its very clever.
Regards
Paul
WB8TSL
On Sat, Aug 25, 2018 at 3:09 PM, Peter Vince
wrote:
> Hi Mark,
>
> If you were able to include optional modulation for the UK's MSF
> signal as well as WWVB, then I'd be ver
As a follow up, I now have a simple WWVB simulator written in C that's now
running an an ATTiny85 using nothing more than the internal, 8
mHz oscillator and about a 6 inch length of wire connected to one of the
pins as an antenna. It generates an approximate 60 kHz signal using PWM on
timer 1. I
, Aug 29, 2018 at 4:35 AM, Wayne Holder
wrote:
> As a follow up, I now have a simple WWVB simulator written in C that's now
> running an an ATTiny85 using nothing more than the internal, 8
> mHz oscillator and about a 6 inch length of wire connected to one of the
> pins as an antenna.
> On Sep 7, 2018, at 2:49 PM, paul swed wrote:
>
> Nick
> Been watching the thread and building a replacement for wwvb. Cause darn it
> I like my spot specific always accurate clocks. However that said the next
> generations of time users for general life only have one
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
Christmas sketching out some designs ...
Thanks - John
-Original Message-
From: Poul-Henning Kamp [mailto:p...@phk.freebsd.dk]
Sent: 4 December, 2018 11:03 PM
To: Discussion of precise time and frequency measurement
; John Moran, Scawby Design
Subject: Re: [time-nuts] new WWVB BPSK
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
; 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
Perth is almost directly
opposite Fort Collins. :-)
Write a WWVB extension to KiwiSDR so you can try it all over the world ?
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
p...@freebsd.org | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to
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
Hi
Given the large “fade” of WWVB over a 24 hour period (it’s not always ground
wave ….) most decent receivers in the past have run a front end with AGC on it.
Indeed 24 bit ADC’s ( > 16 bit ENOB) are out there for not a massive amount of
money.
It is a bit unclear just how much fade
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
t; -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 BPSK dev board
>
> Hi
ff-4094-2750-4874-96dfe2efe...@earthlink.net>, 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 WWV
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 it.
If a watch is “ok
-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
as a theory I wonder if what we expect at night, isn't true anymore
since the street lights are on all night.
I have not taken a listen yet to wwvb. But fear it will be some bad news.
Regards
Paul
WB8TSL
On Sat, Jun 29, 2019 at 11:00 AM Tim Shoppa wrote:
> Interestingly enough, compared to
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 Howa
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 “ideal
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 space
I received a good pointer about doing the BPSK implementation
but have just not gotten it done.
Chris Howard
On 10/12/20 11:02 AM, jimlux wrote:
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
e next thing to take a run at.
> Regards
> Paul
> WB8TSL
>
>
> Hi Paul:
I have looked at the Teensy 4.0 for use as a WWVB SDR receiver.
The problems I have are:
1.) PJRC (the designer/manufacturer) has gone out of their way to block
access to the standard ARM SWD programming inte
the SDR DSP approach interesting and for me at
least the next thing to take a run at.
Regards
Paul
WB8TSL
Hi Paul:
I have looked at the Teensy 4.0 for use as a WWVB SDR receiver.
The problems I have are:
1.) PJRC (the designer/manufacturer) has gone out of their way to block
access
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 much
> what most people copy.
> Essentia
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
what most people copy.
Essentially a 3 foot copper loop with numbers of turns of wire connected
together. Like 25 pair telco cable connected end to end
> 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
>> what most people copy.
>> Essentia
Paul,
I finally got the WWVB d-psk-r board built. I have it connected to an
Arduino UNO and to my NEO-6 GPS module.The GPS module has been
re-programmed to 19.2k baud and only the GPRMC NEMA message is being
sent. The MC34141 is running at 12 volts and I am using 620 ohm
resistors to drive
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
-
From: time-nuts On Behalf Of DON MURRAY via
time-nuts
Sent: Thursday, August 20, 2020 8:41 PM
To: time-nuts@lists.febo.com
Cc: DON MURRAY
Subject: Re: [time-nuts] WWVB SDR discussion
Mike...
Which model did you order?
73
Don
W4WJ
On Thursday, August 20, 2020 Mike Feher wrote:
I just purchased
What may be helpful to the wwvb projects is what is always fixed. This
comes out of the NIST document. Assume you have a fairly good oscillator.
If it can hold within 1/2 cycle of 60 KHz (10 us) for 47 seconds you can
simply sample the top minute sync word. Thats from 59-11 seconds. Always
fixed
scussion of precise time and frequency measurement
> , Bob kb8tq
> Subject: Re: [time-nuts] WWVB PM Time Questions
> Message-ID: <85171.1596229...@critter.freebsd.dk>
> Content-Type: text/plain; charset="us-ascii"
>
>
> Bob kb8tq writes:
>
How do the small AM WWVB clocks work then. They use the 60 KHz crystal and
they don't actually do anything special. In measuring those clocks they are
about 2-6 hz wide. On the spectracoms the crystal is huge. Looks like a HC6
but 3" long. About 1-2 Hz wide.
Using the same small crystals i
I saw this the other day but not sure if this was answered:
> I read the document "Enhanced WWVB Broadcast Format" by John Lowe from
> NIST. One thing that is confusing to me is this paragraph: "Although the
> phase representing the information in each symbol is shown
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
to the 10 MHz. If that comes
from one of the $3 eBay OCXO’s, steer that with a DAC output … now you
have a WWVB GPSDO.
Indeed, if the Teensy needs 28 MHz, then the OCXO will not be quite as cheap.
Bob
I've tried this - It will run just fine, but *all the UART and USB
speeds change*. So
input to the MCU accept something like 10 MHz? If so solder
>> on a cable ….
>> At that point whatever the Teeny does is locked to the 10 MHz. If that comes
>> from one of the $3 eBay OCXO’s, steer that with a DAC output … now you
>> have a WWVB GPSDO.
>> Indeed, if the
. 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 1.000 MHz The Isotemp website is more or less dead, it ha
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 transmitter
se phase comparation, --comparator one input GPS -ublox
derived 60kHz the other input is wwvb 60kHz from Fort Collins Colorado,
it show the typical phase change during the day of the wwvb.
73
Alexander Pummer[hard ware] + David Fannin [soft ware]
On 5/28/2022 10:05 AM, R Putz via time-nuts wro
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