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A command-line piping of rtl_power. Scans frequency band for signals stronger than a threshold (-28dBFS in the example) and prints out the frequency
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| rtl_power -f 130M:170M:2.8M -g 30 -i 1 | awk -F ',' '{if ($7 > -28) print 1e-6*($3 + ($4 - $3) / 2)}' |
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