<div dir="ltr"><div dir="ltr">Thanks, Dave. I'm getting enough free time again that I could be a test site if that is useful. I can also edit or proofread, if need be. Thanks for the info on configuration!<br><br>Ward<br><br>FYI All of us that have been involved in the initial testing of the<br>Magnetometer boards are using cat6a shielded cables and shield<br>connectors. Dave Witten KD0EAG has created a draft install manual that is<br>being reviewed now and will be available on the <a href="http://tangerinesdr.com/" rel="noreferrer" target="_blank">tangerinesdr.com</a> website<br>once the reviews are done.<br><br>Dave KV0S<br><br>On Thu, Jun 3, 2021 at 9:23 AM Ward Silver via TangerineSDR <<br><a href="mailto:tangerinesdr@lists.tapr.org" target="_blank">tangerinesdr@lists.tapr.org</a>> wrote:<br><br>> (Changing the thread title to something more descriptive...)<br>><br>> > Jonathan,<br>> > If necessary, we could probably reduce the i2c bus speed and still<br>> > easily meet the 1 per second magnetometer polling rate currently in use.<br>> > Jules-K2KGJ<br>><br>> RFI from the digital data stream would be mostly generated by the edges of<br>> the I2C pulses and isn't really affected much by the bit rate. The edges<br>> have to remain sharp, so not a lot of relief there. I guess intermittent<br>> polling would result in bursts of RF which might be an improvement.<br>><br>> I want to mention that we probably don't have a serious RFI. As Bill<br>> noted, the receive antenna is quite close to the unit and it is not an<br>> enormous increase in the noise floor.<br>><br>> At this point, having noted a potential issue, I think the focus should be<br>> on proper metallic enclosures and shielding, including cable connectors,<br>> along with careful connections between the chassis and enclosure, in the<br>> configuration we expect to actually be deployed. Once that is available,<br>> more testing can be performed.<br>><br>> 73, Ward N0AX<br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Jun 3, 2021 at 12:42 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>
<a href="mailto:tangerinesdr@lists.tapr.org" target="_blank">tangerinesdr@lists.tapr.org</a><br>
<br>
To subscribe or unsubscribe via the World Wide Web, visit<br>
<a href="http://lists.tapr.org/mailman/listinfo/tangerinesdr_lists.tapr.org" rel="noreferrer" target="_blank">http://lists.tapr.org/mailman/listinfo/tangerinesdr_lists.tapr.org</a><br>
or, via email, send a message with subject or body 'help' to<br>
<a href="mailto:tangerinesdr-request@lists.tapr.org" target="_blank">tangerinesdr-request@lists.tapr.org</a><br>
<br>
You can reach the person managing the list at<br>
<a href="mailto:tangerinesdr-owner@lists.tapr.org" target="_blank">tangerinesdr-owner@lists.tapr.org</a><br>
<br>
When replying, please edit your Subject line so it is more specific<br>
than "Re: Contents of TangerineSDR digest..."<br>
<br>
<br>
Today's Topics:<br>
<br>
1. RFI and PSWS Magnetometer (Ward Silver)<br>
2. Re: RFI and PSWS Magnetometer (Dave Larsen)<br>
<br>
<br>
----------------------------------------------------------------------<br>
<br>
Message: 1<br>
Date: Thu, 3 Jun 2021 08:50:45 -0500<br>
From: Ward Silver <<a href="mailto:hwardsil@gmail.com" target="_blank">hwardsil@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: [TangerineSDR] RFI and PSWS Magnetometer<br>
Message-ID:<br>
<CAFr7d=qO7r2C=fU4pXU_bNz_QK05MOR1xNj=<a href="mailto:sp8VBoyTWVm%2BJA@mail.gmail.com" target="_blank">sp8VBoyTWVm+JA@mail.gmail.com</a>><br>
Content-Type: text/plain; charset="utf-8"<br>
<br>
(Changing the thread title to something more descriptive...)<br>
<br>
> Jonathan,<br>
> If necessary, we could probably reduce the i2c bus speed and still<br>
> easily meet the 1 per second magnetometer polling rate currently in use.<br>
> Jules-K2KGJ<br>
<br>
RFI from the digital data stream would be mostly generated by the edges of<br>
the I2C pulses and isn't really affected much by the bit rate. The edges<br>
have to remain sharp, so not a lot of relief there. I guess intermittent<br>
polling would result in bursts of RF which might be an improvement.<br>
<br>
I want to mention that we probably don't have a serious RFI. As Bill<br>
noted, the receive antenna is quite close to the unit and it is not an<br>
enormous increase in the noise floor.<br>
<br>
At this point, having noted a potential issue, I think the focus should be<br>
on proper metallic enclosures and shielding, including cable connectors,<br>
along with careful connections between the chassis and enclosure, in the<br>
configuration we expect to actually be deployed. Once that is available,<br>
more testing can be performed.<br>
<br>
73, Ward N0AX<br>
-------------- next part --------------<br>
An HTML attachment was scrubbed...<br>
URL: <<a href="http://lists.tapr.org/pipermail/tangerinesdr_lists.tapr.org/attachments/20210603/b002feeb/attachment-0001.html" rel="noreferrer" target="_blank">http://lists.tapr.org/pipermail/tangerinesdr_lists.tapr.org/attachments/20210603/b002feeb/attachment-0001.html</a>><br>
<br>
------------------------------<br>
<br>
Message: 2<br>
Date: Thu, 3 Jun 2021 09:52:29 -0500<br>
From: Dave Larsen <<a href="mailto:kv0s.dave@gmail.com" target="_blank">kv0s.dave@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] RFI and PSWS Magnetometer<br>
Message-ID:<br>
<<a href="mailto:CALuQ3%2BzAuR%2Bz_6ZTNEfmrE4VPZT8eXyLWkDO3wEFeJ0yws8CvA@mail.gmail.com" target="_blank">CALuQ3+zAuR+z_6ZTNEfmrE4VPZT8eXyLWkDO3wEFeJ0yws8CvA@mail.gmail.com</a>><br>
Content-Type: text/plain; charset="utf-8"<br>
<br>
Ward<br>
<br>
FYI All of us that have been involved in the initial testing of the<br>
Magnetometer boards are using cat6a shielded cables and shield<br>
connectors. Dave Witten KD0EAG has created a draft install manual that is<br>
being reviewed now and will be available on the <a href="http://tangerinesdr.com" rel="noreferrer" target="_blank">tangerinesdr.com</a> website<br>
once the reviews are done.<br>
<br>
Dave KV0S<br>
<br>
On Thu, Jun 3, 2021 at 9:23 AM Ward Silver via TangerineSDR <<br>
<a href="mailto:tangerinesdr@lists.tapr.org" target="_blank">tangerinesdr@lists.tapr.org</a>> wrote:<br>
<br>
> (Changing the thread title to something more descriptive...)<br>
><br>
> > Jonathan,<br>
> > If necessary, we could probably reduce the i2c bus speed and still<br>
> > easily meet the 1 per second magnetometer polling rate currently in use.<br>
> > Jules-K2KGJ<br>
><br>
> RFI from the digital data stream would be mostly generated by the edges of<br>
> the I2C pulses and isn't really affected much by the bit rate. The edges<br>
> have to remain sharp, so not a lot of relief there. I guess intermittent<br>
> polling would result in bursts of RF which might be an improvement.<br>
><br>
> I want to mention that we probably don't have a serious RFI. As Bill<br>
> noted, the receive antenna is quite close to the unit and it is not an<br>
> enormous increase in the noise floor.<br>
><br>
> At this point, having noted a potential issue, I think the focus should be<br>
> on proper metallic enclosures and shielding, including cable connectors,<br>
> along with careful connections between the chassis and enclosure, in the<br>
> configuration we expect to actually be deployed. Once that is available,<br>
> more testing can be performed.<br>
><br>
> 73, Ward N0AX<br>
> --<br>
> TangerineSDR mailing list<br>
> <a href="mailto:TangerineSDR@lists.tapr.org" target="_blank">TangerineSDR@lists.tapr.org</a><br>
> <a href="http://lists.tapr.org/mailman/listinfo/tangerinesdr_lists.tapr.org" rel="noreferrer" target="_blank">http://lists.tapr.org/mailman/listinfo/tangerinesdr_lists.tapr.org</a><br>
><br>
<br>
<br>
-- <br>
KV0S - Dave Larsen<br>
Columbia, MO, USA<br>
-------------- next part --------------<br>
An HTML attachment was scrubbed...<br>
URL: <<a href="http://lists.tapr.org/pipermail/tangerinesdr_lists.tapr.org/attachments/20210603/4f8b9a85/attachment-0001.html" rel="noreferrer" target="_blank">http://lists.tapr.org/pipermail/tangerinesdr_lists.tapr.org/attachments/20210603/4f8b9a85/attachment-0001.html</a>><br>
<br>
------------------------------<br>
<br>
Subject: Digest Footer<br>
<br>
TangerineSDR mailing list<br>
<a href="mailto:TangerineSDR@lists.tapr.org" target="_blank">TangerineSDR@lists.tapr.org</a><br>
<a href="http://lists.tapr.org/mailman/listinfo/tangerinesdr_lists.tapr.org" rel="noreferrer" target="_blank">http://lists.tapr.org/mailman/listinfo/tangerinesdr_lists.tapr.org</a><br>
<br>
<br>
------------------------------<br>
<br>
End of TangerineSDR Digest, Vol 27, Issue 16<br>
********************************************<br>
</blockquote></div></div>