Friday, October 11, 2019

4800 symb/sec QPSK signal on 10165 kHz

... noted today on European KiwiSDR. This signal is likely from the same origin as the one described in this blog post and this blog post.

However this time the data stream seems to be pure pseudo-random, at least for all methods of analysis I have tried.

Update 10/12: The signal still carries pseudo-random data

Using GNURadio a perfect constellation diagram can be obtained:

QPSK constellation diagram

... except during times when the signal fades:

QPSK symbols vs. time



The used GNURadio flowgraph, adapted from this tutorial, is shown below.

GNURadio flowgraph





2 comments:

Anonymous said...

KiWi TDoA gave a plot within 3km of the former Radio Luxembourg LW BC site at Junglinster the same as the previously heard signal on 10160KHz.

49.718546, 6.262674

Martin - G8JNJ

hcab14 said...

Thanks Martin, this is what I have expected.