<div dir="ltr">I suggest 2m and 70cm transmissions of 10-50 watts within 10 feet of the installation and with three-axis antenna orientation using a full-size dipole. Cabling and internal conductors are electrically much longer at those frequencies and more likely to pick up significant energy.<div><br></div><div>73, Ward N0AX</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, May 25, 2021 at 12:49 PM <<a href="mailto:tangerinesdr-request@lists.tapr.org">tangerinesdr-request@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">Send TangerineSDR mailing list submissions to<br>
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1. Re: Testing magnetometer with nearby RF (Tom McDermott)<br>
<br>
<br>
----------------------------------------------------------------------<br>
<br>
Message: 1<br>
Date: Tue, 25 May 2021 10:48:23 -0700<br>
From: Tom McDermott <<a href="mailto:tom.n5eg@gmail.com" target="_blank">tom.n5eg@gmail.com</a>><br>
To: TAPR TangerineSDR Modular Software Defined Radio<br>
<<a href="mailto:tangerinesdr@lists.tapr.org" target="_blank">tangerinesdr@lists.tapr.org</a>><br>
Subject: Re: [TangerineSDR] Testing magnetometer with nearby RF<br>
Message-ID:<br>
<<a href="mailto:CACO3nRR1exNE%2B2qZ2v_%2Bm-6zzX4LTU4A9M-gvquvLHBeSArqwg@mail.gmail.com" target="_blank">CACO3nRR1exNE+2qZ2v_+m-6zzX4LTU4A9M-gvquvLHBeSArqwg@mail.gmail.com</a>><br>
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HI BIll - encouraging news from a susceptibility perspective !<br>
<br>
The other concern would be noise radiated by the magnetometer, cabling, and<br>
activity.<br>
Do you have the capability to listen on HF to see if the magnetometer<br>
causes noise when<br>
you make readings?<br>
<br>
-- Tom, N5EG<br>
<br>
On Tue, May 25, 2021 at 9:02 AM Bill Engelke via TangerineSDR <<br>
<a href="mailto:tangerinesdr@lists.tapr.org" target="_blank">tangerinesdr@lists.tapr.org</a>> wrote:<br>
<br>
> I have a TAPR magnetometer in the ground (sitting at 24? deep).<br>
><br>
><br>
><br>
> I have tested for RF exposure as follows:<br>
><br>
><br>
><br>
> 80 M dipole, about 20? away and 15? elevation, 1500 W on 80M<br>
><br>
> 30 M vertical, about 60? away 200W (legal limit) on 30M<br>
><br>
> 40 M double bazooka about 50? away and at 30? elevation, 1500 W on 40M<br>
><br>
> DX Engineering hexbeam, on 50? tower, base of which is 70? away, 1500 W on<br>
> 20M, 17M, 15M, 12M, 10M<br>
><br>
> 4-element 6 meter beam on 50? tower which is about 70? away, 500 W on 6 M<br>
><br>
><br>
><br>
> There was no discernable effect on magnetometer readings from any of these<br>
> tests, which were a carrier for 10 seconds at the noted power level.<br>
><br>
><br>
><br>
> If anyone has ideas for additional tests, please advise; based on the<br>
> above, my impression is that the current magnetometer should produce good<br>
> results when in the yard of typical ham installation.<br>
><br>
><br>
><br>
> -73- Bill, AB4EJ<br>
><br>
><br>
><br>
> Magnetometer installation:<br>
><br>
><br>
><br>
><br>
><br>
> --<br>
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