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<font face="Arial">The address table included in the recent email
did not transfer to the tangerine posting but should have made it
to Bill's personal email.<br>
JM<br>
</font><br>
<div class="moz-cite-prefix">On 10/3/2021 3:48 PM,
<a class="moz-txt-link-abbreviated" href="mailto:tangerinesdr-request@lists.tapr.org">tangerinesdr-request@lists.tapr.org</a> wrote:<br>
</div>
<blockquote type="cite"
cite="mid:mailman.221.1633290484.25593.tangerinesdr_lists.tapr.org@lists.tapr.org">
<pre class="moz-quote-pre" wrap="">Send TangerineSDR mailing list submissions to
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or, via email, send a message with subject or body 'help' to
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Today's Topics:
1. Re: TangerineSDR Digest, Vol 31, Issue 1 (Julius Madey)
----------------------------------------------------------------------
Message: 1
Date: Sun, 3 Oct 2021 15:47:06 -0400
From: Julius Madey <a class="moz-txt-link-rfc2396E" href="mailto:hillfox@fairpoint.net"><hillfox@fairpoint.net></a>
To: Bill Owens <a class="moz-txt-link-rfc2396E" href="mailto:owens.bill@gmail.com"><owens.bill@gmail.com></a>, TAPR TangerineSDR Modular
Software Defined Radio <a class="moz-txt-link-rfc2396E" href="mailto:tangerinesdr@lists.tapr.org"><tangerinesdr@lists.tapr.org></a>
Subject: Re: [TangerineSDR] TangerineSDR Digest, Vol 31, Issue 1
Message-ID: <a class="moz-txt-link-rfc2396E" href="mailto:7f91e2b7-f618-4877-71e3-239d6e5d2744@fairpoint.net"><7f91e2b7-f618-4877-71e3-239d6e5d2744@fairpoint.net></a>
Content-Type: text/plain; charset="utf-8"; Format="flowed"
Bill,
This is the i2c address space of the 9808 and RM3100 per the data
sheets......0 is ground and 1 is Vdd
I think you meant that JMP4 in the second column should be JMP1 rather
than the other way round.? JMP4 is the shield ground.
When the local board is plugged on the Pi 40 pin header as a PiHAT, A0
is pulled low, which limits the possible address space for the RM3100 on
the local board to 0x20 and 0x22, and the local 9808 to 0x18, 0x1A, 0x1C
and 0x1E.
For the remote board, all addresses in the above table are
available......except that used for the 9808 on the local board. If no
address jumpers are installed on the local board, then 9808 addresses
0x19 through 0x1F are available at the remote.
Note that no more than four RM3100s can be used on the same i2c bus ...
expansion beyond that requires an i2c multiplexer like the TCA9548a
which Dave Witten and I were considering for a test board for the RM3100
that would service some 32 RM3100s.
CAUTION regarding the note under extended mode in the address tables and
the use of multiple 9615 differential i2c drops on the CAT5 or CAT6
cable.? Read the 9615 data sheet carefully on the subject of multiple
drops .... intended for short (~ 3meter cable runs) at a 1MHz bus
speed.? My testing to 400+ feet was with only a local and remote board
at 100KHz bus speed which demonstrated well behaved transmission line
behavior for the ~100ohm twisted pair lines in the cable with no
reflections and no transient spikes.
The 9615 data sheet example for multiple drops on the differential lines
show NO termination resistances on the intermediate drops and only line
terminations at the beginning and end 9615s.?? I'm going to hazard a
guess that you might be able to use 100 feet or so of cable with a
couple of intermediate drops within 3 or 4 feet of the remote end and NO
terminations on the 9615s on those boards but would have to actually
scope test that to verify.
The only multiple mag install on a single CAT cable I am aware of is the
one I'm using here with two RM3100 remote boards within about 3 inches
of one another connected only by ground, +3.3V, SDA and SCL? (eg i2c bus
connections only).
Regards,
Jules-K2KGJ
On 10/2/2021 11:36 PM, Bill Owens wrote:
</pre>
<blockquote type="cite">
<pre class="moz-quote-pre" wrap="">I did get the email - thank you! I looked through the info on the
second page of the PDF and I have some questions, but it does confirm
that there are options for as many as four sensor boards, which fits
with what I was considering.
I think the box below the I2C table is wrong for the MCP9808; the
addresses should be 0x1E and 0x1F per the table, and the callout in
the schematic. It also mentions JMP1 in the second column, I think
that should be JMP4.
I also noted that JMP4 is described as being set only on the local
board in most locations, but shown as "Placed" on the remote board in
the NORMAL MODE and EXTENDED MODE boxes.
I'm curious about whether there's a plan for deploying multiple
sensors; one of the notes implies that, without giving any other
details. Would it be a star configuration with the Pi at the center,
or a daisy-chain using both the RJ45 and J10 for the boards in the middle?
Thanks,
Bill N2RKL
On Sat, Oct 2, 2021 at 1:54 PM Julius Madey via TangerineSDR
<<a class="moz-txt-link-abbreviated" href="mailto:tangerinesdr@lists.tapr.org">tangerinesdr@lists.tapr.org</a> <a class="moz-txt-link-rfc2396E" href="mailto:tangerinesdr@lists.tapr.org"><mailto:tangerinesdr@lists.tapr.org></a>> wrote:
I answered Bill a few days ago....perhaps he didn't receive the
email.?? I forwarded the latest schematic and layout for the board
which has a section on setting i2c addresses.? Perhaps Scotty can
update that further.
Jules-K2KGJ
On 10/2/2021 12:00 PM, <a class="moz-txt-link-abbreviated" href="mailto:tangerinesdr-request@lists.tapr.org">tangerinesdr-request@lists.tapr.org</a>
<a class="moz-txt-link-rfc2396E" href="mailto:tangerinesdr-request@lists.tapr.org"><mailto:tangerinesdr-request@lists.tapr.org></a> wrote:
</pre>
<blockquote type="cite">
<pre class="moz-quote-pre" wrap=""> Send TangerineSDR mailing list submissions to
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To subscribe or unsubscribe via the World Wide Web, visit
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or, via email, send a message with subject or body 'help' to
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When replying, please edit your Subject line so it is more specific
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Today's Topics:
1. FW: [HamSCI] Two questions about the new TAPR magnetometer
board (Dr. Nathaniel A. Frissell Ph.D.)
----------------------------------------------------------------------
Message: 1
Date: Fri, 1 Oct 2021 16:22:25 +0000
From: "Dr. Nathaniel A. Frissell Ph.D."
<a class="moz-txt-link-rfc2396E" href="mailto:nathaniel.frissell@scranton.edu"><nathaniel.frissell@scranton.edu></a> <a class="moz-txt-link-rfc2396E" href="mailto:nathaniel.frissell@scranton.edu"><mailto:nathaniel.frissell@scranton.edu></a>
To:<a class="moz-txt-link-rfc2396E" href="mailto:tangerinesdr@lists.tapr.org">"tangerinesdr@lists.tapr.org"</a> <a class="moz-txt-link-rfc2396E" href="mailto:tangerinesdr@lists.tapr.org"><mailto:tangerinesdr@lists.tapr.org></a> <a class="moz-txt-link-rfc2396E" href="mailto:tangerinesdr@lists.tapr.org"><tangerinesdr@lists.tapr.org></a> <a class="moz-txt-link-rfc2396E" href="mailto:tangerinesdr@lists.tapr.org"><mailto:tangerinesdr@lists.tapr.org></a>
Subject: [TangerineSDR] FW: [HamSCI] Two questions about the new TAPR
magnetometer board
Message-ID:
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Hi,
I'm sending these questions from Bill N2RKL to the TangerineSDR list. They were originally posted on the HamSCI list.
73 Nathaniel
<a class="moz-txt-link-abbreviated" href="mailto:From:hamsci@googlegroups.com">From:hamsci@googlegroups.com</a> <a class="moz-txt-link-rfc2396E" href="mailto:hamsci@googlegroups.com"><mailto:hamsci@googlegroups.com></a> <a class="moz-txt-link-rfc2396E" href="mailto:hamsci@googlegroups.com"><hamsci@googlegroups.com></a> <a class="moz-txt-link-rfc2396E" href="mailto:hamsci@googlegroups.com"><mailto:hamsci@googlegroups.com></a> On Behalf Of Bill Owens
Sent: Thursday, September 30, 2021 9:22 AM
To: HamSCI<a class="moz-txt-link-rfc2396E" href="mailto:hamsci@googlegroups.com"><hamsci@googlegroups.com></a> <a class="moz-txt-link-rfc2396E" href="mailto:hamsci@googlegroups.com"><mailto:hamsci@googlegroups.com></a>
Subject: [HamSCI] Two questions about the new TAPR magnetometer board
I've listened to the last couple Zoom sessions and also found the layout pictures that Scotty showed a few weeks ago, but I haven't been able to work out answers for two questions:
- How many I2C addresses can be set for the magnetometer and the temperature sensor on each board?
- Are the RM3100 components soldered on the boards, or perhaps on half of them? It looks like there are options for SMT header sockets, and for the components themselves.
Thanks,
Bill N2RKL
--
Please follow the HamSCI Community Participation Guidelines athttp://hamsci.org/hamsci-community-participation-guidelines <a class="moz-txt-link-rfc2396E" href="http://hamsci.org/hamsci-community-participation-guidelines"><http://hamsci.org/hamsci-community-participation-guidelines></a><a class="moz-txt-link-rfc2396E" href="https://nam10.safelinks.protection.outlook.com/?url=http%3A%2F%2Fhamsci.org%2Fhamsci-community-participation-guidelines&data=04%7C01%7Cnathaniel.frissell%40scranton.edu%7Cb1641a76631b43daaadf08d9841553f1%7Ca8edc49a41f14c699768a7f6d7c3b8c3%7C0%7C0%7C637686049874237358%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=TPhDGbKvqiaOqA6FWYIaFntFkhAhTXHTzabPU8gzYMk%3D&reserved=0"><https://nam10.safelinks.protection.outlook.com/?url=http%3A%2F%2Fhamsci.org%2Fhamsci-community-participation-guidelines&data=04%7C01%7Cnathaniel.frissell%40scranton.edu%7Cb1641a76631b43daaadf08d9841553f1%7Ca8edc49a41f14c699768a7f6d7c3b8c3%7C0%7C0%7C637686049874237358%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=TPhDGbKvqiaOqA6FWYIaFntFkhAhTXHTzabPU8gzYMk%3D&reserved=0></a> <<a class="moz-txt-link-freetext" href="https://nam10.safelinks.protection.outlook.com/?url=http%3A%2F%2Fhamsci.org%2Fhamsci-community-participation-guidelines&data=04%7C01%7Cnathaniel.frissell%40scranton.edu%7Cb1641a76631b43daaadf08d9841553f1%7Ca8edc49a41f14c699768a7f6d7c3b8c3%7C0%7C0%7C637686049874237358%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=T">https://nam10.safelinks.protection.outlook.com/?url=http%3A%2F%2Fhamsci.org%2Fhamsci-community-participation-guidelines&data=04%7C01%7Cnathaniel.frissell%40scranton.edu%7Cb1641a76631b43daaadf08d9841553f1%7Ca8edc49a41f14c699768a7f6d7c3b8c3%7C0%7C0%7C637686049874237358%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=T</a>
</pre>
</blockquote>
</blockquote>
<pre class="moz-quote-pre" wrap=""> PhDGbKvqiaOqA6FWYIaFntFkhAhTXHTzabPU8gzYMk%3D&reserved=0>.
</pre>
<blockquote type="cite">
<blockquote type="cite">
<pre class="moz-quote-pre" wrap=""> ---
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</pre>
</blockquote>
</blockquote>
<pre class="moz-quote-pre" wrap=""> aniel.frissell%40scranton.edu%7Cb1641a76631b43daaadf08d9841553f1%7Ca8edc49a41f14c699768a7f6d7c3b8c3%7C0%7C0%7C637686049874247307%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=xxd2yhh%2FJMcfbszeF0tqqlhO29Ff2wu360iaFlx8UcE%3D&reserved=0>.
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