[Lowfer] WWVB clock on 60 kHz
Garry
k3siw at sbcglobal.net
Mon Feb 6 17:24:42 EST 2017
Mike, I just got home and uploaded some SIW wspr-15 decodes. I see
you're decoding the signal too. I have an HP435B power meter with a high
sensitivity probe (good down to -70 dBm). Will try that on the signal
going to my sdr-iq with and without the band-reject filter. As far as
what spectrum laboratory and spectravue show at LF there isn't any
significant difference in the noise floor, but the spurious garbage
seems to be less and that's a good thing.
I have several RTL2832 dongles running here at the moment and for $20
they do an incredible job.
On PC1 I listen to the local NOAA weather channel at 162.425 MHz. That
SDR is preceded by a selectable 100 MHz upconverter so I can tune in
things down to almost 0 Hz if desired. I also have no problem copying my
local 1296 MHz beacon directly with it. Even with the miniature clock
crystal it's quite stable. But since the units are so cheap one of these
days I may tear one apart and apply a GPS-referenced clock.
On PC2 I'm currently monitoring aircraft traffic via ADSB packets at
1090 MHz and RTL1090 + adsbScope2.7 software. That PC also produces
weather maps from the NOAA -15 and -19 satellites using SDR#, WXtoImg,
and Orbitran software. Running all that plus spectravue, spectrum
laboratory, argo, firefox, and thunderbird still only loads the CPU
about 15%.
And when radio gets boring I have RTL2832-type dongles that decode NTSC
and ATSC signals so I can watch TV too, hi.
I'd like more A/D bits than my ancient SDR-IQs provide too. I know the
Perseus does 14 bit conversions. Wonder if by now there's stuff out
there that is up to 16 bit resolution (or more!) and what it costs.
--
73, Garry, K3SIW, EN52ta, Elgin, IL
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