<div dir="ltr">Hi Bill - looking at differences in the noise level in several of the ham bands 160 - 6 meters would be good.<div>Additionally, looking at the clock frequencies of I2C chip would also be good. My recollections</div><div>is that the chip is capable of operating at 100 kbps, 1 Mbps, 4 Mbps, so those would be candidates.</div><div>I'd expect to at least see weak clock lines at the current setting of the device. Do you know what </div><div>bit rate that Dave's software currently sets up for I2C operation?</div><div><br></div><div>-- Tom, N5EG</div><div><br></div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, May 25, 2021 at 2:15 PM Bill Engelke via TangerineSDR <<a href="mailto:tangerinesdr@lists.tapr.org">tangerinesdr@lists.tapr.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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<p class="MsoNormal">Tom – I am able to listen across a wide variety of frequencies – I can try that – though, I am a bit fuzzy on what to listen for – I can try turning the device on and off and observe the waterfall on the Flex and see if anything shows up,
at least in the ham bands – any other suggestions? - tnx es 73- Bill<u></u><u></u></p>
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<p class="MsoNormal"><b>From:</b> TangerineSDR <<a href="mailto:tangerinesdr-bounces@lists.tapr.org" target="_blank">tangerinesdr-bounces@lists.tapr.org</a>>
<b>On Behalf Of </b>Tom McDermott via TangerineSDR<br>
<b>Sent:</b> Tuesday, May 25, 2021 12:48 PM<br>
<b>To:</b> TAPR TangerineSDR Modular Software Defined Radio <<a href="mailto:tangerinesdr@lists.tapr.org" target="_blank">tangerinesdr@lists.tapr.org</a>><br>
<b>Cc:</b> Tom McDermott <<a href="mailto:tom.n5eg@gmail.com" target="_blank">tom.n5eg@gmail.com</a>><br>
<b>Subject:</b> [EXTERNAL] Re: [TangerineSDR] Testing magnetometer with nearby RF<u></u><u></u></p>
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<p class="MsoNormal">HI BIll - encouraging news from a susceptibility perspective !<u></u><u></u></p>
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<p class="MsoNormal">The other concern would be noise radiated by the magnetometer, cabling, and activity.<u></u><u></u></p>
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<p class="MsoNormal">Do you have the capability to listen on HF to see if the magnetometer causes noise when<u></u><u></u></p>
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<p class="MsoNormal">you make readings?<u></u><u></u></p>
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<p class="MsoNormal">-- Tom, N5EG<u></u><u></u></p>
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<p class="MsoNormal">On Tue, May 25, 2021 at 9:02 AM Bill Engelke via TangerineSDR <<a href="mailto:tangerinesdr@lists.tapr.org" target="_blank">tangerinesdr@lists.tapr.org</a>> wrote:<u></u><u></u></p>
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<p class="MsoNormal">I have a TAPR magnetometer in the ground (sitting at 24” deep).
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<p class="MsoNormal">I have tested for RF exposure as follows:<u></u><u></u></p>
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<p class="MsoNormal">80 M dipole, about 20’ away and 15’ elevation, 1500 W on 80M<u></u><u></u></p>
<p class="MsoNormal">30 M vertical, about 60’ away 200W (legal limit) on 30M<u></u><u></u></p>
<p class="MsoNormal">40 M double bazooka about 50’ away and at 30’ elevation, 1500 W on 40M<u></u><u></u></p>
<p class="MsoNormal">DX Engineering hexbeam, on 50’ tower, base of which is 70’ away, 1500 W on 20M, 17M, 15M, 12M, 10M<u></u><u></u></p>
<p class="MsoNormal">4-element 6 meter beam on 50’ tower which is about 70’ away, 500 W on 6 M<u></u><u></u></p>
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<p class="MsoNormal">There was no discernable effect on magnetometer readings from any of these tests, which were a carrier for 10 seconds at the noted power level.
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<p class="MsoNormal">If anyone has ideas for additional tests, please advise; based on the above, my impression is that the current magnetometer should produce good results when in the yard of typical
ham installation.<u></u><u></u></p>
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<p class="MsoNormal">-73- Bill, AB4EJ<u></u><u></u></p>
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<p class="MsoNormal">Magnetometer installation:<u></u><u></u></p>
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