On Sat, 27 Feb 2010, Markus Vester wrote:
> In April 2003, I attempted to transmitt an 8.97 kHz carrier, radiating
> about 1 microwatt from my normal LF antenna (220 pF at ~ 9m eff.
> height). I drove around and stopped in different places, putting up a 6m
> fishing pole with a wire, connected to a resonant circuit and the laptop
> soundcard. Each time I took a short Spectrogram full-band screenshot,
> along with a narrowband capture from a special Argo version, patched for
> 22 kHz samplerate. An assembly of the screenshots is at
> http://freenet-homepage.de/df6nm/8970_ALL.gif. Maximum detection range
> was 6 km, just marginally outside the reactive nearfield. No
> noiseblanking was attempted at the time.
Dear Markus,
In what qrss mode (FFT-bandwith) you resived such a signal? P=1uW D=6km
yelds E=1.3uV/m It seems to be usefull to estimate noise level. But we
should normalyze this to bandwith.
Regards,
Alexander/RA9MB
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