Hello everyone,<div><br>I&#39;m looking for help.<br><br><br></div><div>I have downloaded and built Airprobe (gsm-receiver, gssm, ) on my Ubuntu machine.<br><br>a/ Using the capture file provided on the web site, I could get a first level of decoding done:<br>


<br><span style="color: rgb(51, 51, 255);">nphan@ubuntu:~/airprobe/gsm-receiver/src/python$ more capture_941.8M_112.log </span><br style="color: rgb(51, 51, 255);"><span style="color: rgb(51, 51, 255);">Key: &#39;0000000000000000&#39;</span><br style="color: rgb(51, 51, 255);">


<span style="color: rgb(51, 51, 255);">Configuration: &#39;&#39;</span><br style="color: rgb(51, 51, 255);"><span style="color: rgb(51, 51, 255);">  No configuration set.</span><br style="color: rgb(51, 51, 255);"><span style="color: rgb(51, 51, 255);">configure_receiver</span><br style="color: rgb(51, 51, 255);">


<span style="color: rgb(51, 51, 255);">1670173 0: 15 06 21 00 01 00 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b</span><br style="color: rgb(51, 51, 255);"><span style="color: rgb(51, 51, 255);">1670177 0: 15 06 21 00 01 00 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b</span><br style="color: rgb(51, 51, 255);">


<span style="color: rgb(51, 51, 255);">1670183 0: 15 06 21 00 01 00 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b</span><br style="color: rgb(51, 51, 255);"><span style="color: rgb(51, 51, 255);">1670187 0: 15 06 21 00 01 00 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b</span><br style="color: rgb(51, 51, 255);">


<span style="color: rgb(51, 51, 255);">1670193 0: 15 06 21 00 01 00 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b</span><br style="color: rgb(51, 51, 255);"><span style="color: rgb(51, 51, 255);">1670197 0: 15 06 21 00 01 00 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b</span><br style="color: rgb(51, 51, 255);">


<span style="color: rgb(51, 51, 255);">1670204 0: 01 06 07 60 00 25 54 a8 f9 74 05 5e 18 73 2b 2b 2b 2b 2b 2b 2b 2b 2b</span><br style="color: rgb(51, 51, 255);"><span style="color: rgb(51, 51, 255);">1670208 0: 01 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b</span><br style="color: rgb(51, 51, 255);">


<span style="color: rgb(51, 51, 255);">1670214 0: 01 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b</span><br style="color: rgb(51, 51, 255);"><span style="color: rgb(51, 51, 255);">1670218 0: 01 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b</span><br style="color: rgb(51, 51, 255);">


<span style="color: rgb(51, 51, 255);">1670224 0: 15 06 21 00 01 00 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b</span><br style="color: rgb(51, 51, 255);"><span style="color: rgb(51, 51, 255);">1670228 0: 15 06 21 00 01 00 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b</span><br style="color: rgb(51, 51, 255);">


<span style="color: rgb(51, 51, 255);">1670234 0: 15 06 21 00 01 00 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b</span><br><br>but in wireshark I can&#39;t see any decoded info such as BCCH system info etc...<br><br>


</div><div>b/ It looks like my capture isn&#39;t working properly either (ie I can&#39;t even get the 1st level of decoding as with capture file provided in the web site).<br><br><span style="color: rgb(51, 51, 255);">nphan@ubuntu:~/airprobe/gsm-receiver/src/python$ ./capture.sh 953.4M</span><br style="color: rgb(51, 51, 255);">


<span style="color: rgb(51, 51, 255);">/usr/local/bin/usrp_rx_cfile.py</span><br style="color: rgb(51, 51, 255);"><span style="color: rgb(51, 51, 255);">Capturing for 10 seconds to capture_953.4M_112.cfile (4642850 samples)</span><br style="color: rgb(51, 51, 255);">


<span style="color: rgb(51, 51, 255);">Using RX d&#39;board B: Flex 900 Rx</span><br style="color: rgb(51, 51, 255);"><span style="color: rgb(51, 51, 255);">USB sample rate 571.428k</span><br style="color: rgb(51, 51, 255);">


<span style="color: rgb(51, 51, 255);">nphan@ubuntu:~/airprobe/gsm-receiver/src/python$ ./go.sh capture_953.4M_112.cfile </span><br style="color: rgb(51, 51, 255);"><span style="color: rgb(51, 51, 255);">&gt;&gt;&gt; gr_fir_ccc: using SSE</span><br style="color: rgb(51, 51, 255);">


<span style="color: rgb(51, 51, 255);">&gt;&gt;&gt; gr_fir_ccf: using SSE</span><br style="color: rgb(51, 51, 255);"><span style="color: rgb(51, 51, 255);">Key: &#39;0000000000000000&#39;</span><br style="color: rgb(51, 51, 255);">


<span style="color: rgb(51, 51, 255);">Configuration: &#39;&#39;</span><br style="color: rgb(51, 51, 255);"><span style="color: rgb(51, 51, 255);">  No configuration set.</span><br style="color: rgb(51, 51, 255);"><span style="color: rgb(51, 51, 255);">configure_receiver</span><br style="color: rgb(51, 51, 255);">


<span style="color: rgb(51, 51, 255);">gr_buffer::allocate_buffer: warning: tried to allocate</span><br style="color: rgb(51, 51, 255);"><span style="color: rgb(51, 51, 255);">   115 items of size 568. Due to alignment requirements</span><br style="color: rgb(51, 51, 255);">


<span style="color: rgb(51, 51, 255);">   512 were allocated.  If this isn&#39;t OK, consider padding</span><br style="color: rgb(51, 51, 255);"><span style="color: rgb(51, 51, 255);">   your structure to a power-of-two bytes.</span><br style="color: rgb(51, 51, 255);">


<span style="color: rgb(51, 51, 255);">   On this platform, our allocation granularity is 4096 bytes.</span><br style="color: rgb(51, 51, 255);"><span style="color: rgb(51, 51, 255);">nphan@ubuntu:~/airprobe/gsm-receiver/src/python$ </span><br>


 </div><br><div>I have a USRP1 with 2 RFX900 with a ClockTamer providing 52Mhz clock.</div><div><br></div><div>I
 have changed the various Python scripts so that the RFX daughter on 
side B and RX2  are selected. I have also changed the clock rate to 52M to match my HW.  I have input the frequency of a known BTS 
(which kal can see and measure the offset).</div>
<div><br></div><div>Any hints about what is wrong in my set-up or process?</div><div><br></div><div>Thanks</div><div>Nghia</div>