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mcoms/rtlsdr.md

Created June 11, 2013 01:17
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rtlsdr.md

RTL-SDR tips and tricks

Sample format

The output is IQ (quadrature) sampling. It's interleaved, so first byte is I, second Q and so on. The samples are unsigned bytes, so you subtract 127 from them to get their real ralue (lying between -127 and +127).

rtl_tcp control

Send a command byte followed by a 32-bit big-endian int parameter.

# https://gist.github.com/simeonmiteff/3792676
SET_FREQUENCY = 0x01
SET_SAMPLERATE = 0x02
SET_GAINMODE = 0x03
SET_GAIN = 0x04
SET_FREQENCYCORRECTION = 0x05

e.g. socket.puts [command, parameter].pack('CL>') in Ruby.

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