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The magnetometer boards use linear regulators. The magnetometer
itself has a switching component. I have been meaning to test it
for radiation and develop appropriate shielding if necessary.<br>
<br>
David N1HAC<br>
<br>
<div class="moz-cite-prefix">On 6/2/21 10:40 AM, Jonathan via
TangerineSDR wrote:<br>
</div>
<blockquote type="cite" cite="mid:FA88D37C-475D-4AC2-916E-E756668570BB@gmail.com">
<div dir="ltr">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. </div>
<div dir="ltr"><br>
</div>
<div dir="ltr">Jonathan</div>
<div dir="ltr">KC3EEY</div>
<div dir="ltr"><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:<br>
<br>
</div>
<blockquote type="cite">
<div dir="ltr">
<div dir="ltr">Was the test unit powered by a switching power
supply module? If so, replacing it with a linear supply
might help.
<div><br>
</div>
<div>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.</div>
<div><br>
</div>
<div>If the noise is being radiated directly from the
electronics, we'll have to tackle that separately.</div>
<div><br>
</div>
<div>73, Ward N0AX</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">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:<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 style="overflow-wrap: break-word;">
Hi Bill,
<div><br>
</div>
<div>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.</div>
<div><br>
</div>
<div>73 Nathaniel W2NAF</div>
<div><br>
<div>
<div>— <br>
Dr. Nathaniel A. Frissell, Ph.D., W2NAF</div>
<div>HamSCI Lead<br>
Assistant Professor<br>
Department of Physics and Electrical Engineering<br>
University of Scranton<br>
(973) 787-4506</div>
</div>
<div><br>
<blockquote type="cite">
<div>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:</div>
<br>
<div>
<div dir="ltr">Glad to hear of the insensitivity
to ambient RF at a variety of frequencies,
Bill!
<div><br>
</div>
<div>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.</div>
<div><br>
</div>
<div>73, Ward N0AX</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">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:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
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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" 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; 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 moz-do-not-send="true">cid:image004.png@01D756D6.2EB4CD30</a>]<br>
<br>
Vertical configuration:<br>
<br>
[<a moz-do-not-send="true">cid:image005.png@01D756D7.049AA500</a>]<br>
<br>
Straight-on configuration<br>
<br>
[<a 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 moz-do-not-send="true">cid:image001.png@01D756D4.9FD34E80</a>]<br>
<br>
Screenshot of 80 M on multiband vertical<br>
<br>
[<a moz-do-not-send="true">cid:image002.png@01D756D5.12202BC0</a>]<br>
<br>
Screenshot of 160 M, multiband vertical<br>
<br>
[<a 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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