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The regulators on the magnetometer boards are very good filters of
any noise on the Raspberry Pi power supply. Any noise coming from
the host system would be general system noise conducted on the
cable.<br>
<br>
David N1HAC<br>
<br>
<div class="moz-cite-prefix">On 6/2/21 10:51 AM, Bill Engelke via
TangerineSDR wrote:<br>
</div>
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<div class="WordSection1">
<p class="MsoNormal">Hello all:<o:p></o:p></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.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">So the magnetometer gets its power feed
from the Raspberry Pi.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></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?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></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<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<div style="border:none;border-top:solid #E1E1E1
1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b>From:</b> TangerineSDR
<a class="moz-txt-link-rfc2396E" href="mailto:tangerinesdr-bounces@lists.tapr.org"><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 class="moz-txt-link-rfc2396E" href="mailto:tangerinesdr@lists.tapr.org"><tangerinesdr@lists.tapr.org></a><br>
<b>Cc:</b> Jonathan <a class="moz-txt-link-rfc2396E" href="mailto:emuman100@gmail.com"><emuman100@gmail.com></a>; Ward
Silver <a class="moz-txt-link-rfc2396E" href="mailto:hwardsil@gmail.com"><hwardsil@gmail.com></a><br>
<b>Subject:</b> [EXTERNAL] Re: [TangerineSDR] TangerineSDR
Digest, Vol 27, Issue 3<o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></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. <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Jonathan<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">KC3EEY<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-bottom:12.0pt"><br>
On Jun 2, 2021, at 9:50 AM, Ward Silver via TangerineSDR
<<a href="mailto:tangerinesdr@lists.tapr.org" moz-do-not-send="true">tangerinesdr@lists.tapr.org</a>>
wrote:<o:p></o:p></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<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.<o:p></o:p></p>
<div>
<p class="MsoNormal"><o:p> </o:p></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.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">If the noise is being radiated
directly from the electronics, we'll have to tackle
that separately.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">73, Ward N0AX<o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></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" moz-do-not-send="true">nathaniel.frissell@scranton.edu</a>>
wrote:<o:p></o:p></p>
</div>
<blockquote style="border:none;border-left:solid #CCCCCC
1.0pt;padding:0in 0in 0in
6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt">
<div>
<p class="MsoNormal">Hi Bill, <o:p></o:p></p>
<div>
<p class="MsoNormal"><o:p> </o:p></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.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">73 Nathaniel W2NAF<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<div>
<p class="MsoNormal">— <br>
Dr. Nathaniel A. Frissell, Ph.D., W2NAF<o:p></o:p></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<o:p></o:p></p>
</div>
</div>
<div>
<p class="MsoNormal"><br>
<br>
<o:p></o:p></p>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<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" moz-do-not-send="true">tangerinesdr@lists.tapr.org</a>>
wrote:<o:p></o:p></p>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<div>
<p class="MsoNormal">Glad to hear of the
insensitivity to ambient RF at a variety
of frequencies, Bill!
<o:p></o:p></p>
<div>
<p class="MsoNormal"><o:p> </o:p></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.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">73, Ward N0AX<o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></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" moz-do-not-send="true">tangerinesdr-request@lists.tapr.org</a>>
wrote:<o:p></o:p></p>
</div>
<blockquote style="border:none;border-left:solid
#CCCCCC 1.0pt;padding:0in 0in 0in
6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt">
<p class="MsoNormal">Send TangerineSDR
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<br>
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" moz-do-not-send="true">bill.engelke@ua.edu</a>><br>
To: TAPR TangerineSDR Modular Software
Defined Radio<br>
<<a href="mailto:tangerinesdr@lists.tapr.org" target="_blank" moz-do-not-send="true">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" moz-do-not-send="true">BN8PR15MB31855B741907BD4C37902902FA3E9@BN8PR15MB3185.namprd15.prod.outlook.com</a>><br>
<br>
Content-Type: text/plain;
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<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 href="cid:image004.png@01D756D6.2EB4CD30" moz-do-not-send="true">cid:image004.png@01D756D6.2EB4CD30</a>]<br>
<br>
Vertical configuration:<br>
<br>
[<a href="cid:image005.png@01D756D7.049AA500" moz-do-not-send="true">cid:image005.png@01D756D7.049AA500</a>]<br>
<br>
Straight-on configuration<br>
<br>
[<a href="cid:image006.png@01D756D7.049AA500" moz-do-not-send="true">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 href="cid:image001.png@01D756D4.9FD34E80" moz-do-not-send="true">cid:image001.png@01D756D4.9FD34E80</a>]<br>
<br>
Screenshot of 80 M on multiband vertical<br>
<br>
[<a href="cid:image002.png@01D756D5.12202BC0" moz-do-not-send="true">cid:image002.png@01D756D5.12202BC0</a>]<br>
<br>
Screenshot of 160 M, multiband vertical<br>
<br>
[<a href="cid:image003.png@01D756D5.6F866360" moz-do-not-send="true">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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End of TangerineSDR Digest, Vol 27,
Issue 3<br>
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