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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<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b>From:</b> TangerineSDR <tangerinesdr-bounces@lists.tapr.org>
<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 <tangerinesdr@lists.tapr.org><br>
<b>Cc:</b> Tom McDermott <tom.n5eg@gmail.com><br>
<b>Subject:</b> [EXTERNAL] Re: [TangerineSDR] Testing magnetometer with nearby RF<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">HI BIll - encouraging news from a susceptibility perspective !<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">The other concern would be noise radiated by the magnetometer, cabling, and activity.<o:p></o:p></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<o:p></o:p></p>
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<p class="MsoNormal">you make readings?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">-- Tom, N5EG<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></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">tangerinesdr@lists.tapr.org</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">I have a TAPR magnetometer in the ground (sitting at 24” deep).
<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">I have tested for RF exposure as follows:<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">80 M dipole, about 20’ away and 15’ elevation, 1500 W on 80M<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">30 M vertical, about 60’ away 200W (legal limit) on 30M<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">40 M double bazooka about 50’ away and at 30’ elevation, 1500 W on 40M<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">DX Engineering hexbeam, on 50’ tower, base of which is 70’ away, 1500 W on 20M, 17M, 15M, 12M, 10M<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">4-element 6 meter beam on 50’ tower which is about 70’ away, 500 W on 6 M<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">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.
<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">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.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">-73- Bill, AB4EJ<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Magnetometer installation:<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><img border="0" width="482" height="640" style="width:5.0208in;height:6.6666in" id="gmail-m_-1345674919675661803Picture_x0020_1" src="cid:image001.png@01D75181.1E173F30"><o:p></o:p></p>
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<p class="MsoNormal">-- <br>
TangerineSDR mailing list<br>
<a href="mailto:TangerineSDR@lists.tapr.org" target="_blank">TangerineSDR@lists.tapr.org</a><br>
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