Yes. I dial into the remote radios available on the internet and look at
the transmitter testing going on in the west. Think Fallon NV may currently
be the only transmitter on. But the SDRs seem to pick up the signal just
fine and do jow the GRI. 5990.
Watch out some stations can tune down to 50KHz and lower but have either
poor or no antennas.
Regards
Paul
WB8TSL

On Wed, Mar 6, 2024 at 9:10 AM JOHN HARTZELL via time-nuts <
time-nuts@lists.febo.com> wrote:

JOHN HARTZELL via time-nuts writes:

Yes, ages ago:

https://phk.freebsd.dk/loran-c/

https://phk.freebsd.dk/AducLoran/

It's really simple:  Get a microcontroller with a good ADC, connect
it directly to a loop-antenna, and of you go...

The RPI2040 has a 500ksps ADC, it should be plenty...

--
Poul-Henning Kamp      | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG        | TCP/IP since RFC 956
FreeBSD committer      | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.

KiwiSDR receivers have a loran decoder built in. There are many online all over the world.

Steve KD2OM

Sent from my iPhone.

John:

When you say WWV, do you mean WWVB?

What are you trying to do?

--- Graham

==

On Wed, Mar 6, 2024 at 8:56 AM Poul-Henning Kamp via time-nuts <
time-nuts@lists.febo.com> wrote:

Steve Sykes via time-nuts writes:

Well, "loran displayer" really, as far as I know, there is no way to get any usable data out of it.

--
Poul-Henning Kamp      | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG        | TCP/IP since RFC 956
FreeBSD committer      | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.

Hi

Depending a lot on just where you are, antennas for this stuff can be anywhere from pretty small / simple to fairly large. This also depends a bit on how much of the day you are trying to track signals.

If we’re talking WWVB and Loran, the antenna approach is similar (though possibly not identical for both). If you are really going after WWV, that would be a bit of a different antenna from Loran-C.

Lots of fun !!!!

Bob

Loran-C and WWV signals?

Hi John,

What a coincidence. In the past few days (post 2/29) I've been working
with another time-nut to debug a vintage WWV clock that messed up the
leap year and now seems permanently one day ahead. One theory was that
the clock doesn't do DOY calculations correctly in the 21st century.
Another is that WWV forgot to set the leap year bit. The latter is easy
to check, yes?

As it turns out it's only WWVB that has the leap year bit and WWV does
not. That means WWV receivers must handle leap years on their own,
checking the low 2 bits of the BCD year. That's not strictly correct,
and implies WWV will fail in the year 2100. WWVB, on the other hand,
includes a specific leap year bit so the circuit doesn't need to look at
BCD year data. As a result it will handle the year 2100 correctly.

As part of this rabbit hole I wanted to see what WWV was actually
outputting so I connected a portable Sony S/W radio phone-out to my
laptop rec-in, found 15 MHz was best, turned off my laptop switching
power supply, recorded a minute of data at 44.1 kHz, fed that into
Stable32, clicked on "Filter", picked 80 to 120 Hz bandpass, and Voila,
I got the WWV subcode loud and clear. All 60 bits of data [1] were correct.

Stable32 image attached. After all that hassle, I made a mental note to
add SDR to my Christmas list. ;-) It sounds like someone could make a
cool 24x7 logging project using all the WWV frequencies, dynamically
tracking amplitude and phase, etc.

/tvb

[1] https://en.wikipedia.org/wiki/WWV_(radio_station)

I have an SDR RSPdx and can easily tune in the 5MHz, 10MHz, and 15MHz
WWV signals - although to my surprise, seldom all 3 at once.  Generally
one is strong, another is so-so, and the 3rd is lost to background
noise.  I do have a pretty simple long-wire antenna feeding the SDR, so
noise is always an issue.  In any case, no problem HEARING the time
announced "... at the tone, the time is...", but no way to export that
information that I'm aware of.

FYI - I heard Trump wants to kill support for WWV in favor of GSM
solutions as a federal cost saving thing.  My 50+ year old Heathkit
GC-1000 will become useless if he does - but so far keeps running fine
(now that I'm feeding it 12V power - lost the AC power supply during the
last long power outage over the winter).

On 3/6/2024 12:13 PM, Poul-Henning Kamp via time-nuts wrote:

On 3/6/24 17:45, Tom Van Baak via time-nuts wrote:

WWV tracking (and CHU as well) is a major experiment in the HamSci
(https://hamsci.org) community, where they've built low-cost hardware to
monitor multiple WWV frequencies simultaneously.  There's a major effort
lined up to get data from hundreds of stations during the eclipse on
April 8.

SDR is a whole new rabbit hole to run down.  We're on the cusp of a
shift from radios that listen to a few hundred kHz ate a time to what we
used to call just "software radio" -- an ADC that sends high resolution
wideband data to the PC and lets the processing happen there.  USB3 is a
fast enough interface to allow the full DC - 60 MHz spectrum to be sent
in one giant firehose.

There's an ~$250 device called the RX888 that's available on eBay and
Amazon that does this (no link because there are multiple providers and
I can't vouch for any of them).  And Phil Karn has developed a
completely new client/server based radio that uses multicast to allow
many clients receiving hundreds of channels to connect to one receiver
server.  Check out ka9q-radio at https://github.com/ka9q/ka9q-radio

This is still very much do-it-yourself land and the software is
undergoing rapid development.  But what it can do is remarkable.

I run a remote receiver at a quiet rural location that uses the RX888
and ka9q-radio running on an i5 class computer to monitor weak-signal
"wspr" (https://en.wikipedia.org/wiki/WSPR_(amateur_radio_software) )
beacons on 10 bands simultaneously, as well as record WWV and CHU data.
Our station typically reports over 50,000 receptions from ~1800 stations
per day.

That data goes into a worldwide database that space scientists are using
for propagation studies (examples:
https://hamsci.org/article/wsprnet-data-used-validate-sami3-published-space-weather-journal
;
https://hamsci.org/sites/default/files/publications/2021_HamSCI/20210320_1700z-Gwyn_Griffiths_G3ZIL_Rob_Robinett_AI6VN.pdf
; see also http://wsprdaemon.org).

And the receiver is clocked by a GPSDO, so it is time-nuts related. :-)

John