[Noisebridge-discuss] Using the National Weather Radio to calibrate SDR-dongles?

[Andreas Hornig]

Hi John,

nice to read you.

On Wed, Dec 30, 2020 at 1:11 AM John Menerick <john at syn.agency> wrote:

> I use the atomic clock frequencies for a similar effort.  I  jump around
> the frequencies based upon solar weather and atmosphere propagation.
> https://www.nist.gov/time-distribution/radio-station-wwv
> There are recordings online one can use to tune.  Meanwhile, you could use
> the publicly available webSDRs to get the recordings you want?
>

I thought about these clock frequencies, too. But they are too low for my
standard rtlsdrs and the limesdr mini I have.

The websdrs I checked so far "only" provided the already downsampled
recordings. I would like to have the 2Mhz recording because that allows me
to use several channels at once and also to have the possibility to detect
the center on a 1Hz basis instead of already reducing the precision there
already.

if I see it correctly, the NWR channels are all like in here
https://www.youtube.com/watch?v=TbYVzeHA9BA
So when there is no voice, the unmodulated carrier is visible. That would
be great and "easy" to use for detecting the peak.
Also, if there are always several channels active or in reach, you can
check several peaks (if recorded with 2mhz bandwidth). that would be handy
for the calibration purpose.
And also if these voice and no voice sections are mostly like this, I only
need ~10 seconds or so for the detection. But this I need to try out with a
sample :).

Best regards,


Andreas
(dh0rn)

PS: I have some problems with the mailing list, because it thinks I am a
computer writing these emails. So I had to resend the last two emails and I
hope not to spam the ml. If so, please tell me.
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