Possibly something like this?
https://www.youtube.com/watch?v=6SHGAEhnsYk&list=PL3XBzmAj53RlkM2_xRq2NodFjFtBrgzx0&index=11&t=1s
Ray
On 2022-01-25 12:11, Bob kb8tq wrote:
Hi
The original idea was a transmitter with a 20m range. The “check
the regs” are aimed at that sort of setup.
For somethin
Adam,
Where is the PPS signal derived from? If from a GPS, what do you mean by
processing on the PI? Do You update the seconds counter of the PI clock
with each PPS?
I have a NEO-6M connected to a STM32 custom board to drive six 2.3-inch,
7 segment LEDs. I use the PPS to kick the watchdog ti
Although not advisable a search of the Internet will turn up several.
There is a well know Raspberry PI version. The range of the transmitters
is only a couple of feet so if placed next to your clock it will work.
Anything that would cover your entire house would certainly not be
advised.
The
Jeffry,
Yes, the sync once per day is due to the Arduino software. The ES100
needs to be told when to start receiving the WWVB signal and when to go
to sleep. You can modify the software to change the time and number of
syncs per day. I would suggest you change it to 2am CA time. The daily
sync is
They reduced the price by 20% but they want $19.40 for shipping. I
decided I didn't need the development kit. I ordered one of the AM WWVB
kits back in early Nov and the shipping charge was only $4.50.
Original Message
Subject: [time-nuts] WWVB BPSK Atomic Clock Receiver Modules
Thanks John.
Ray,
AB7HE
Original Message
Subject: Re: [time-nuts] WWVB teensy BPSK early experiments
From: "John C. Westmoreland, P.E."
Date: Sat, October 31, 2020 9:06 pm
To: Discussion of precise time and frequency measurement
Ray,
https://github.com/chris-elfpen/Teensy4WW
Sorry Bob. I meant to address this question to Paul.
"Things already accomplished by Chris in the wwvb AM receiver"
Is there a link to the AM receiver? Curious as to what that looks like.
Ray,
AB7HE
Original Message
Subject: Re: [time-nuts] WWVB teensy BPSK early experiments
F
Bob,
"Things already accomplished by Chris in the wwvb AM receiver"
Is there a link to the AM receiver? Curious as to what that looks like.
Ray,
AB7HE
Original Message
Subject: Re: [time-nuts] WWVB teensy BPSK early experiments
From: Bob kb8tq
Date: Sat, October 31, 2020 11:4
Paul, by going to high power mode I meant at the 200, 500, or 800 msec
point of each second.
Ray
Original Message
Subject: Re: [time-nuts] WWVB Dephaser Question
From: Bob kb8tq
Date: Fri, October 09, 2020 4:12 pm
To: Discussion of precise time and frequency measurement
Hi
I
Paul,
I was seeing a -10 dBm on the SA when they enter high power mode at
night. At low power they are only a couple of dB above the nearby noise
makers. But that is at the output of the last stage of my receiver. The
WWVB signal was about 10-15 dB above the noise makers in my work shop. I
don't kn
Paul, Bob,
I am not using any commercial receiver. I am building everything from
scratch. The RF front end starts with a ferrite rod antenna feeding a
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 a
Paul and Bob,
Thanks for the comments. I figured I wouldn't be able to get a 60 kHz
signal anywhere near a WWVB receiver. I just wondered how bad the signal
leakage from the divider IC would actually be. It is at a 5V logic level
but I don't know if that means 5V of signal radiation.
I was try
Bob,
I am using a ferrite rod antenna for the receiver. No outside antenna.
Ray
Original Message
Subject: Re: [time-nuts] WWVB Dephaser Question
From: Bob kb8tq
Date: Thu, October 08, 2020 12:40 pm
To: Discussion of precise time and frequency measurement
Hi
A lot depends on
I have read several different articles where the WWVB phase shift is
eliminated by doubling the signal to 120 kHz. Several members of the
list have built these units.
Assume I build a circuit to double the incoming signal and use a schmitt
trigger to get a 120 kHz square wave. If I then divide th
Paul,
You message came in just as I clicked Send on my message. If I change
the MC34151 to a 7474 to synchronize the 60 kHz signal, does that mean
the phase change always occurs on the zero crossing like WWVB?
Ray
Original Message
Subject: Re: [time-nuts] WWVB PM Time Questions
Paul and Rodger,
I used the actual transformer, YCL 20F001NG, and 1N4148 diodes like the
schematic shows. I isolated the grounds on the mixer because Rodger had
a note in the document saying he was picking up noise.
I experimented with the 60 kHz drive level and increased it to 285 mV
Pk-Pk, whic
Paul,
Yes, I built the d-psk-r per the schematic. However, I think I did not
understand how it actually worked. I was expecting it to be able to
duplicate the WWVB sine wave signal with the phase reversal present when
the PM data bit changed from a 0 to 1 or 1 to 0. I have a 60 kHz sine
wave going
Paul,
I was able to capture this with the scope. I believe the sharp downward
spike may be when the dpskr 180 degree phase shift takes place??
Ray,
AB7HE
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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 the tra
> deriving exact time to way closer than a second from the signal
To the average consumer if the clock is accurate to within a minute or
so they are happy. The clocks also run on a RTC and only use WWVB to
keep the RTC more or less accurate. The clocks are also only looking at
the carrier level c
Does the La Crosse UltrAtomic clock actually use a crystal filter or do
they digitally filter the signal? Has anyone ever looked inside of one
of the clocks? Just curious.
Ray
AB7HE
Original Message
Subject: Re: [time-nuts] WWVB SDR discussion
From: Mark Haun
Date: Mon, August
Paul,
I wasn't talking about putting the d-psk-r software on the Blue Pill
board. The d-psk-r software will be on the Arduino board.
What I was thinking of doing was putting a single NEMA message on the
Blue Pill board. Then connect the UART transmit line to the Arduino in
place of the GPS UART l
Rodger,
Thanks for the code and explanation. I will load it into an Arduino and
connect one of my ublox modules to it. When I get the RF front end put
together the emulator should give me a nice signal to look at on the
scope. To feed my own data in I could program a Blue Pill board with a
NEMA str
So the $64 million dollar question is this. How do the La Crosse
distributors sell the ULTRATOMIC clock for $35-$40. That means La
Crosse's manufacturing cost is probably around $15-$20. Building a
million clocks would get the cost down, but still. I'm sure there
are a lot of transistors in the
Paul,
"The new de-psk-r I built has no raw wwvb outputs." What do you mean by
raw?
I have been thinking about how the phase shift could be detected in
software instead of hardware. Could something like this maybe work:
If a micro is able to detect the zero crossing of a sine wave it should
be abl
I'm not sure what I will use for the VCTCXO. I have a few different
ideas to play around with. Testing when I have time over the next couple
of weeks I may find a suitable solution.
Ray,
AB7HE
Original Message
Subject: Re: [time-nuts] WWVB PM Time Questions
From: paul swed
Date
Thanks to all for the suggestions. I dug a ferrite rod AM radio antenna
out of the box this morning. I have a box of 10 left over from the late
80s. It measures 0.950 mH so I will add some turns to get it to 1.5 mH
which will be easier to resonate at 60 kHz. Then I need to build up the
RF amp and r
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
I want to decode the WWVB time information using the BPSK information
that is broadcast. I will use a STM32 to do the actual decoding of the
bit stream. This is just an exercise in "can I do it?" as I know I can
buy clocks for $30 that use the BPSK method. At one time you could buy
an IC that outpu
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