I had somewhat better luck today using the -w option with hackrf_transfer. Does HackRF only play back .wav files and not just a file of I/Q samples? I sent a CW signal with one HackRF (hackrf_transfer -c ...) and captured with the other using hackrf_transfer -w I was then able to play back the resulting wav file and see the spike on osmocom_fft -f 97000000 -a hackrf -v. The same procedure except for playing back a file captured by "hackrf_transfer -r" did not play back correctly, showed lots of extra noise and no spike. Thanks Rachel
On Sat, Nov 8, 2014 at 7:14 PM, Rachel Citchlow <[email protected]> wrote: > Hello all, > I am trying a setup with two HackRFs with their antenna ports connected > to one another with an RF cable with a 30dB attenuator in between. I would > like to send something with one of them and receive with the other. > > My steps were as follows: > > 1. started with lesson1.grc receiver with center_freq of 97M, and channel > freq of 96.3M. Added a file sink in parallel with the osmocom source to > save the I/Q samples as received by the HackRF. I thus obtained a data > file, data.bin, with a part of a song played on the local music channel > 96.3. > > 2. In lesson1.grc, substituted the osmocom source by a file source > pointing to data.bin. Played lesson1.grc and was able to hear the audio the > same way as in step 1. This confirmed that data.bin contains good I/Q > samples. > > 3. Connected the two HackRFs to each other and played a sample signal on > one and received it with the other, saw a strong narrow spike on the > receive FFT plot: > rachel@radio1:~/Documents/playback$ hackrf_transfer -c 10 -f 96300000 -s > 2000000 -a 1 -x 20 > > 4. Transmitted data.bin on one HackFR and tried to receive with > lesson1.grc on the other. > rachel@radio1:~/Documents/playback$ hackrf_transfer -t data.bin -f > 97000000 -s 2000000 -a 1 -x 20 > This did not work. On the receiving end, I saw the FFT plot get several > narrow spikes and generally rise up, but it did not look like the FFT plot > in step #1. A different noise pattern (different from when nothing was > transmitted) and some clicking came out of the speaker. > > What am I missing? Advice appreciated. > thanks > Rachel > >
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