<div dir="ltr">The easiest thing would be to power the RPi from a linear supply (if that's not already the case). Noise can be coupled to radiating cables in a lot of ways. Shielding the RPi with a proper bond from the CAT shield to the enclosure will be necessary "in production." An E-field shield around the magnetometer (Faraday cage of thin foil, perhaps) would also be required. I am not anticipating any electronics or programming changes to the boards themselves.<div><br></div><div>Assuming a linear supply and some ferrite beads on the CAT cable don't knock the noise down, there will probably have to be some sniffing with a small E or H probe and a spectrum analyzer. I have a quiet site at my rural station and a spectrum analyzer so I could do some testing there.<div><br></div><div>73, Ward N0AX</div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Jun 2, 2021 at 9:51 AM Bill Engelke <<a href="mailto:bill.engelke@ua.edu">bill.engelke@ua.edu</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">
<div lang="EN-US">
<div class="gmail-m_1348598314388615602WordSection1">
<p class="MsoNormal">Hello all:<u></u><u></u></p>
<p class="MsoNormal">The magnetometer is in 2 parts: an adapter that plugs in as a daughter board (“hat”) to the Raspberry Pi, and (at the other end of the cable) the matching board that contains the magnetometer itself.<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">So the magnetometer gets its power feed from the Raspberry Pi.<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">So, what I wonder is: does the power supply of the R-Pi have a noise component that is getting superimposed on to the power supply going to the magnetometer unit?<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">BTW: when I did my testing, I used shielded CAT-6 cable. With some effort, I could add the recommended ferrite beads. Take me a few weeks…. -73- Bill<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<div>
<div style="border-right:none;border-bottom:none;border-left:none;border-top:1pt solid rgb(225,225,225);padding:3pt 0in 0in">
<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>Jonathan via TangerineSDR<br>
<b>Sent:</b> Wednesday, June 2, 2021 9:40 AM<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> Jonathan <<a href="mailto:emuman100@gmail.com" target="_blank">emuman100@gmail.com</a>>; Ward Silver <<a href="mailto:hwardsil@gmail.com" target="_blank">hwardsil@gmail.com</a>><br>
<b>Subject:</b> [EXTERNAL] Re: [TangerineSDR] TangerineSDR Digest, Vol 27, Issue 3<u></u><u></u></p>
</div>
</div>
<p class="MsoNormal"><u></u> <u></u></p>
<div>
<p class="MsoNormal">I’ll have to double check the schematic, but I don’t think there are any switching regulators on the magnetometer board. The noise could be coming from the i2c clock or possibly the internal clock of the magnetometer IC. <u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal">Jonathan<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal">KC3EEY<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal" style="margin-bottom:12pt"><br>
On Jun 2, 2021, at 9:50 AM, Ward Silver via TangerineSDR <<a href="mailto:tangerinesdr@lists.tapr.org" target="_blank">tangerinesdr@lists.tapr.org</a>> wrote:<u></u><u></u></p>
</div>
<blockquote style="margin-top:5pt;margin-bottom:5pt">
<div>
<div>
<p class="MsoNormal">Was the test unit powered by a switching power supply module? If so, replacing it with a linear supply might help.<u></u><u></u></p>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal">In a "production configuration" we should recommend shielded CAT5 or CAT6 cable with type 31 ferrite beads or cores on each end of the Ethernet cable. If practical, a linear power supply should be used for both the magnetometer module
and the host SDR. There are clean switchmode supplies, as well, but they would have to be tested.<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal">If the noise is being radiated directly from the electronics, we'll have to tackle that separately.<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal">73, Ward N0AX<u></u><u></u></p>
</div>
</div>
<p class="MsoNormal"><u></u> <u></u></p>
<div>
<div>
<p class="MsoNormal">On Wed, Jun 2, 2021 at 8:39 AM Dr. Nathaniel A. Frissell Ph.D. <<a href="mailto:nathaniel.frissell@scranton.edu" target="_blank">nathaniel.frissell@scranton.edu</a>> wrote:<u></u><u></u></p>
</div>
<blockquote style="border-top:none;border-right:none;border-bottom:none;border-left:1pt solid rgb(204,204,204);padding:0in 0in 0in 6pt;margin:5pt 0in 5pt 4.8pt">
<div>
<p class="MsoNormal">Hi Bill, <u></u><u></u></p>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal">Thank you for that evaluation, and like Ward, I am glad to hear the magnetometer does not appear to be sensitive to RF. I’m sorry to hear about its effects on 80 and 160 m, and I guess that will need to be discussed some more.<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal">73 Nathaniel W2NAF<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
<div>
<div>
<p class="MsoNormal">— <br>
Dr. Nathaniel A. Frissell, Ph.D., W2NAF<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal">HamSCI Lead<br>
Assistant Professor<br>
Department of Physics and Electrical Engineering<br>
University of Scranton<br>
(973) 787-4506<u></u><u></u></p>
</div>
</div>
<div>
<p class="MsoNormal"><br>
<br>
<u></u><u></u></p>
<blockquote style="margin-top:5pt;margin-bottom:5pt">
<div>
<p class="MsoNormal">On Jun 1, 2021, at 10:09 PM, Ward Silver via TangerineSDR <<a href="mailto:tangerinesdr@lists.tapr.org" target="_blank">tangerinesdr@lists.tapr.org</a>> wrote:<u></u><u></u></p>
</div>
<p class="MsoNormal"><u></u> <u></u></p>
<div>
<div>
<p class="MsoNormal">Glad to hear of the insensitivity to ambient RF at a variety of frequencies, Bill!
<u></u><u></u></p>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal">This brings up the system-level issue of RFI created by the PSWS as conducted emissions, most likely. It would be a problem if the PSWS interferes with its own local receiver! So we (meaning the design team) will need to carefully evaluate
the I/O and power lines to be sure they are RF-quiet. I can probably help with that as I am winding down a series of back-to-back-to-back book projects and have some time coming up.<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal">73, Ward N0AX<u></u><u></u></p>
</div>
</div>
<p class="MsoNormal"><u></u> <u></u></p>
<div>
<div>
<p class="MsoNormal">On Tue, Jun 1, 2021 at 9:00 PM <<a href="mailto:tangerinesdr-request@lists.tapr.org" target="_blank">tangerinesdr-request@lists.tapr.org</a>> wrote:<u></u><u></u></p>
</div>
<blockquote style="border-top:none;border-right:none;border-bottom:none;border-left:1pt solid rgb(204,204,204);padding:0in 0in 0in 6pt;margin:5pt 0in 5pt 4.8pt">
<p class="MsoNormal">Send TangerineSDR mailing list submissions to<br>
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Today's Topics:<br>
<br>
1. Magnetometer RF testing, additional results (Bill Engelke)<br>
<br>
<br>
----------------------------------------------------------------------<br>
<br>
Message: 1<br>
Date: Tue, 1 Jun 2021 16:15:00 +0000<br>
From: Bill Engelke <<a href="mailto:bill.engelke@ua.edu" target="_blank">bill.engelke@ua.edu</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: [TangerineSDR] Magnetometer RF testing, additional results<br>
Message-ID:<br>
<<a href="mailto:BN8PR15MB31855B741907BD4C37902902FA3E9@BN8PR15MB3185.namprd15.prod.outlook.com" target="_blank">BN8PR15MB31855B741907BD4C37902902FA3E9@BN8PR15MB3185.namprd15.prod.outlook.com</a>><br>
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Content-Type: text/plain; charset="us-ascii"<br>
<br>
Here is a follow-up to my last email regarding possible RF interactions with the magnetometer. A couple of suggestions came in from the community:<br>
<br>
<br>
1. Ward Silver, N0AX, recommended to test by transmitting with a dipole near the magnetometer in several configurations, on 2 meters with 50 w.<br>
2. Tom McDermott, N5EG, recommended to look for RF noise being generated by the magnetometer that might get into your station receiver.<br>
<br>
Here are results of doing such tests:<br>
<br>
<br>
1. I built a 2-m dipole specifically for this so that I could test with the antenna (a)broadside to the magnetometer, (b)vertical to it, and (c) pointed towards it. (photos) The antenna was located about 10 feet from the magnetometer, which is buried at
2 feet in the soil (its standard installation as tested by Jules and others), and connected to the station with shielded CAT-6.<br>
<br>
Broadside configuration<br>
<br>
[<a>cid:image004.png@01D756D6.2EB4CD30</a>]<br>
<br>
Vertical configuration:<br>
<br>
[<a>cid:image005.png@01D756D7.049AA500</a>]<br>
<br>
Straight-on configuration<br>
<br>
[<a>cid:image006.png@01D756D7.049AA500</a>]<br>
<br>
The antenna was connected via a new 50 foot RG-8 cable to an Icom IC-706MKIIG, set to high output (50 watts), 145 MHz. I did my best to do what Ward suggested.<br>
<br>
Results: I never saw the magnetometer readings change when I keyed the rig; this was the same for the 3 different antenna angles. I have to conclude that the magnetometer is not sensitive to 2 meters.<br>
<br>
<br>
1. Using the FlexRadio 6600, I looked for noise being generated by the magnetometer on all ham bands from 160 m to 10 meters. I looked for wide band noise by watching the waterfall and turning the magnetometer on and off. If I saw noise appear, I tried turning
the magnetometer off and on to see if the noise would come and go with being connected to the magnetometer base card on the Raspberry Pi. I used the appropriate antenna for each band (i.e., the one I use for my station), as follows: (160 M) - multiband vertical,
(80M) halfwave dipole at 15 ' (20 feet away) and also multiband vertical about 50' away, (60M) multiband vertical, (40 M) double bazooka inverted vee, (20M through 10 M) DX Engineering Hexbeam on 50' tower.<br>
<br>
Results: First the good news: I never saw wideband noise attributable to the magnetometer on the bands 60 meters and higher in frequency. I did see noise on 80M and on 160M. The magnetometer does generate noise of about 0.4 db as shown on the FlexRadio s-meter
on 80M. (Note that this is a severe case, as the 80 M dipole is only up 15' and about 20' away from the magnetometer - but this is probably a typical situation). On 160 M, the magnetometer generated 1 db of noise.<br>
<br>
Screenshot of 80 M result using dipole<br>
<br>
[<a>cid:image001.png@01D756D4.9FD34E80</a>]<br>
<br>
Screenshot of 80 M on multiband vertical<br>
<br>
[<a>cid:image002.png@01D756D5.12202BC0</a>]<br>
<br>
Screenshot of 160 M, multiband vertical<br>
<br>
[<a>cid:image003.png@01D756D5.6F866360</a>]<br>
<br>
I suppose that we would recommend turning off the magnetometer if you are working DX on 80 Meters; possibly separating the magnetometer from the antenna might also help, but I was not able to test that.<br>
<br>
-73- Bill, AB4EJ<br>
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<a href="mailto:TangerineSDR@lists.tapr.org" target="_blank">TangerineSDR@lists.tapr.org</a><br>
<a href="https://nam11.safelinks.protection.outlook.com/?url=http%3A%2F%2Flists.tapr.org%2Fmailman%2Flistinfo%2Ftangerinesdr_lists.tapr.org&data=04%7C01%7Cbill.engelke%40ua.edu%7C2d9d3b6143a84f830f3108d925d47901%7C2a00728ef0d040b4a4e8ce433f3fbca7%7C0%7C0%7C637582416775791831%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=f7hDcZP0uI27mZN9UF%2F4T9%2FEinudiKdr2bKhh74tohE%3D&reserved=0" target="_blank">http://lists.tapr.org/mailman/listinfo/tangerinesdr_lists.tapr.org</a><u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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</blockquote>
<blockquote style="margin-top:5pt;margin-bottom:5pt">
<div>
<p class="MsoNormal">-- <br>
TangerineSDR mailing list<br>
<a href="mailto:TangerineSDR@lists.tapr.org" target="_blank">TangerineSDR@lists.tapr.org</a><br>
<a href="https://nam11.safelinks.protection.outlook.com/?url=http%3A%2F%2Flists.tapr.org%2Fmailman%2Flistinfo%2Ftangerinesdr_lists.tapr.org&data=04%7C01%7Cbill.engelke%40ua.edu%7C2d9d3b6143a84f830f3108d925d47901%7C2a00728ef0d040b4a4e8ce433f3fbca7%7C0%7C0%7C637582416775801823%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=G9uVXmLSxFYayONNqPhn9VgTHUQzdRJmKB02bi%2FCbbU%3D&reserved=0" target="_blank">http://lists.tapr.org/mailman/listinfo/tangerinesdr_lists.tapr.org</a><u></u><u></u></p>
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