<div dir="ltr"><div>There is some software called 'LTE-Cell-Scanner' [1] which (funnily enough) will search for LTE cells and give you PPM figures. Unfortunately the repository is pretty much un-maintained, it has issues finding dependencies (yay cmake), and it doesnt build without modifications on Raspbian. The best information i've found on getting it running is this blog: [2]</div><div><br></div><div>Because I was somewhat bored this afternoon, I spent some time getting it running under Raspbian (mainly based on the blog at [2]), and wrote up my experiences here:</div><div><a href="https://gist.github.com/darksidelemm/b517e6a9b821c50c170f1b9b7d65b824">https://gist.github.com/darksidelemm/b517e6a9b821c50c170f1b9b7d65b824</a><br></div><div><br></div><div>As it turns out, my RTLSDR requires a PPM correction of about -2 PPM, so not too bad!</div><div><br></div><div>Hopefully this is useful...</div><div><br></div><div>73</div><div>Mark VK5QI</div><div><br></div><div>[1] <a href="https://github.com/Evrytania/LTE-Cell-Scanner">https://github.com/Evrytania/LTE-Cell-Scanner</a></div><div>[2] <a href="https://anthturner.com/2017/03/03/experiments-in-rf-hunting-for-lte/">https://anthturner.com/2017/03/03/experiments-in-rf-hunting-for-lte/</a></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sun, Nov 19, 2017 at 3:03 PM, <span dir="ltr"><<a href="mailto:vk4tec@tech-software.net" target="_blank">vk4tec@tech-software.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div lang="EN-AU" link="blue" vlink="purple"><div class="m_-5002770210944625616WordSection1"><p class="MsoNormal"><span>4G should be very good<u></u><u></u></span></p><p class="MsoNormal"><span><u></u> <u></u></span></p><p class="MsoNormal"><span>They have some of the best frequency and time standards<u></u><u></u></span></p><p class="MsoNormal"><span><u></u> <u></u></span></p><p class="MsoNormal"><span>They have to because of the CDMA modulation<u></u><u></u></span></p><p class="MsoNormal"><span><u></u> <u></u></span></p><p class="MsoNormal"><span>Andrew <u></u><u></u></span></p><p class="MsoNormal"><span><u></u> <u></u></span></p><div><div style="border:none;border-top:solid #e1e1e1 1.0pt;padding:3.0pt 0cm 0cm 0cm"><p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> OZAPRS [mailto:<a href="mailto:ozaprs-bounces@aprs.net.au" target="_blank">ozaprs-bounces@aprs.<wbr>net.au</a>] <b>On Behalf Of </b>Gavin Rogers<br><b>Sent:</b> Sunday, 19 November 2017 2:27 PM<br><b>To:</b> Australian APRS Users <<a href="mailto:ozaprs@aprs.net.au" target="_blank">ozaprs@aprs.net.au</a>><br><b>Subject:</b> Re: [OZAPRS] How to make a raspberry pi satgate for the ISS<u></u><u></u></span></p></div></div><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal" style="margin-bottom:12.0pt">Maybe different in other states, but in Perth the only carrier with GSM still is Vodadone, and their coverage isn't good enough where I am to get a good calibration.<br><br><br><u></u><u></u></p><div><p class="MsoNormal">On 19 November 2017 11:21:49 am AWST, Peter VK2MPJ <<a href="mailto:vk2mpj@yahoo.com.au" target="_blank">vk2mpj@yahoo.com.au</a>> wrote:<u></u><u></u></p><blockquote style="border:none;border-left:solid #cccccc 1.0pt;padding:0cm 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm"><p class="MsoNormal">I’m curious why you say that using kal and a GSM signal is not possible anymore?<u></u><u></u></p><div><p class="MsoNormal">I did this locally just last weekend…<u></u><u></u></p></div><div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal">2MPJ<u></u><u></u></p></div><div><p class="MsoNormal"><u></u> <u></u></p><div><p class="MsoNormal"><br><br><u></u><u></u></p><blockquote style="margin-top:5.0pt;margin-bottom:5.0pt"><div><p class="MsoNormal">On 19 Nov 2017, at 12:42 pm, Gavin Rogers <<a href="mailto:grogers@vk6hgr.echidna.id.au" target="_blank">grogers@vk6hgr.echidna.id.au</a>> wrote:<u></u><u></u></p></div><p class="MsoNormal"><u></u> <u></u></p><div><div><p class="MsoNormal" style="background:white"><span style="font-size:9.0pt;font-family:"Helvetica",sans-serif">On 19/11/2017 9:30 AM,<span class="m_-5002770210944625616apple-converted-space"> </span><a href="mailto:vk4tec@tech-software.net" target="_blank"><span style="color:purple">vk4tec@tech-software.net</span></a><span class="m_-5002770210944625616apple-converted-space"> </span>w<wbr>rote:<u></u><u></u></span></p></div><blockquote style="margin-top:5.0pt;margin-bottom:5.0pt;font-variant-caps:normal;text-align:start;word-spacing:0px"><p class="MsoNormal" style="background:white"><span style="font-size:9.0pt;font-family:"Helvetica",sans-serif"><u></u> <u></u></span></p><div><div><div><p class="MsoNormal" style="background:white">Or, as i've mentioned before, just link to the existing Direwolf SDR+APRS guide, which covers off setting up an igate pretty well: <a href="https://github.com/wb2osz/direwolf/blob/master/doc/Raspberry-Pi-SDR-IGate.pdf" target="_blank"><span style="color:purple">https://github.com/<wbr>wb2osz/direwolf/blob/master/<wbr>doc/Raspberry-Pi-SDR-IGate.pdf</span></a><u></u><u></u></p></div></div></div></blockquote><p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Helvetica",sans-serif"><br><span style="background:white">In this guide, there's a link to a script that will tune to a NOAA frequency and re-calibrate an SDR TV stick (<span class="m_-5002770210944625616apple-converted-space"> </span></span></span><a href="https://github.com/khaytsus/direwolf-init" target="_blank"><span style="font-size:9.0pt;font-family:"Helvetica",sans-serif;color:purple;background:white">https://github.com/khaytsus/<wbr>direwolf-init</span></a><span class="m_-5002770210944625616apple-converted-space"><span style="font-size:9.0pt;font-family:"Helvetica",sans-serif;background:white"> </span></span><span style="font-size:9.0pt;font-family:"Helvetica",sans-serif;background:white">)</span><span style="font-size:9.0pt;font-family:"Helvetica",sans-serif"><br><br><span style="background:white">What would be a good high-stability signal source here in VK for the calibration? I used to use the kal program to calibrate against GSM transmitters, but that's not possible any more. I'd think the trunking control channel for an emergency services' channel would be stable, strong and always on? Or DAB+ transmitter, or..?</span><br><br><br><span style="background:white">73</span><br><span style="background:white">Gavin.</span><br style="font-variant-caps:normal;text-align:start;word-spacing:0px"><br></span><u></u><u></u></p><p class="MsoNormal" style="background:white"><span style="font-size:9.0pt;font-family:"Helvetica",sans-serif"><u></u> <u></u></span></p><pre style="background:white;font-variant-caps:normal;text-align:start;word-spacing:0px"><span style="font-size:9.0pt">-- <u></u><u></u></span></pre><pre style="background:white"><span style="font-size:9.0pt"><u></u> <u></u></span></pre><pre style="background:white"><span style="font-size:9.0pt"> Gavin Rogers | Amateur radio station VK6HGR <u></u><u></u></span></pre><pre style="background:white"><span style="font-size:9.0pt"> <a href="http://www.livingwaters.com/good" target="_blank"><span style="color:purple">http://www.livingwaters.<wbr>com/good</span></a> | <a href="http://vk6hgr.ampr.org/" target="_blank"><span style="color:purple">http://vk6hgr.ampr.org/</span></a><u></u><u></u></span></pre><pre style="background:white"><span style="font-size:9.0pt"> MSN/Skype/Email: <a href="mailto:grogers@vk6hgr.echidna.id.au" target="_blank"><span style="color:purple">grogers@vk6hgr.echidna.id.au</span></a><u></u><u></u></span></pre><p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Helvetica",sans-serif;background:white">______________________________<wbr>_________________</span><span style="font-size:9.0pt;font-family:"Helvetica",sans-serif"><br><span style="background:white">OZAPRS mailing list</span><br></span><a href="mailto:OZAPRS@aprs.net.au" target="_blank"><span style="font-size:9.0pt;font-family:"Helvetica",sans-serif;color:purple;background:white">OZAPRS@aprs.net.au</span></a><span style="font-size:9.0pt;font-family:"Helvetica",sans-serif"><br></span><a href="http://lists.aprs.net.au/mailman/listinfo/ozaprs" target="_blank"><span style="font-size:9.0pt;font-family:"Helvetica",sans-serif;color:purple;background:white">http://lists.aprs.net.au/<wbr>mailman/listinfo/ozaprs</span></a><u></u><u></u></p></div></blockquote></div><p class="MsoNormal"><u></u> <span class="HOEnZb"><font color="#888888"><u></u></font></span></p></div></blockquote></div><span class="HOEnZb"><font color="#888888"><p class="MsoNormal"><br>-- <br>Gavin Rogers mobile<u></u><u></u></p></font></span></div></div><br>______________________________<wbr>_________________<br>
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