hackrf test util

git-svn-id: https://svn.code.sf.net/p/freetel/code@3032 01035d8c-6547-0410-b346-abe4f91aad63

diff --git a/codec2-dev/octave/hackrf_twotone.m b/codec2-dev/octave/hackrf_twotone.m
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+% hackrf_twotone.m
+%
+% David Rowe Nov 2015
+%
+% Generates a two tone test signal that can be played out of HackRF
+%
+% To play file at 10.7MHz used:
+%   $ hackrf_transfer -t ../octave/twotone.iq -f 10000000 -a 0 -x 47
+%
+% However 2nd harmonic at 21.4 was only -32dBC so not really useful for my application
+% in testing an ADC
+
+Fs = 8E6;
+fc = 2E6;
+f1 = fc;
+f2 = fc+1E3;
+A = 127;
+T = 2;
+
+N = T*Fs;
+t = 0:N-1;
+%s = A*exp(j*2*pi*t*f1/Fs) + A*exp(j*2*pi*t*f2/Fs);
+s = A*exp(j*2*pi*t*f2/Fs);
+save_hackrf("twotone.iq",s);