[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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