[TangerineSDR] (no subject)

John Gibbons jcg66 at case.edu
Sat Apr 18 14:59:26 EDT 2020

David KD0EAG,

I'm developing the low cost PSWS and the PNI RM3100 magnetometer is slated
to be on it.  I just purchased 10 of their dev modules and am now starting
the remote interface design.

Where are you in the design for this aspect of the project?  Scotty sent me
the XCVR chip (NXP PCA9615DPJ) he was looking at that would extend the I^2C
bus, but I was wondering if I'm re-inventing the wheel here.

My platform is a RasPi3B+, so I can talk to both SPI and I^2C.   Are you
also planning on using the MCP9808 temp sensor (and will it be remote with
the magnetometer?)?
Also, do you have a cable (like CAT5) picked for the cable and have you
picked a pinout yet?  Making these the same makes a lot of sense long term.
I've been looking at the standard CAT5 cable and it has some wire swaps on
pins 3-4-5-6 that would make them good for power runs and 1-2 / 7-8 would
be better for differential comm paths.

If you have any C (or python) code  talk to these units I'm very interested
if you are willing to share - if not, I understand..

I also have 40+ years of PCB layout experience, so I would be glad to help
with that (as I'm already doing it for the PSWS).

Let me know where I can help.

John N8OBJ

John C. Gibbons
Director - Sears Undergraduate Design Laboratory
Dept. of Electrical Engineering and Computer Science
Case Western Reserve University
10900 Euclid Ave, Glennan 314
Cleveland, Ohio  44106-7071
Phone (216) 368-2816 <216-368-2816> FAX (216) 368-6888 <216-368-6888>
E-mail: jcg66 at case.edu

On Sat, Apr 18, 2020 at 1:46 PM David Witten via TangerineSDR <
tangerinesdr at lists.tapr.org> wrote:

> I have already sent messages to David McGraw and John Gibbons offering to
> send Simple Magnetometer Support Boards (SMSB's) immediately if they wish.
> I do have a few of the full Magnetometer Support Boards with Extension
> (MSBx's)  unpopulated PCBs but they would take time to stuff and test.
> They are built in pairs, and contain more and more aggravating parts to
> solder.  The final layout of these boards remains significantly in flux,
> and out of my hands.
> Depending on the situation, I find the SMSBs much easier to work with for
> testing code, etc.  They are cheap, easy to populate, essentially
> disposable, and seem to work well.  They just do not test the lowest noise
> levels we hope to achieve.  To my knowledge, the significance of this
> difference has yet to be established.
> I'm happy to work with anyone within my personal limitations, and am eager
> to see as many of these devices in test as possible.
> Dave Witten, KD0EAG
> From: "Dr. Nathaniel A. Frissell Ph.D." <nathaniel.frissell at scranton.edu>
>> To: David McGaw <david.g.mcgaw at dartmouth.edu>, TangerineSDR Listserv <
>> tangerinesdr at lists.tapr.org>
>> Cc:
>> Bcc:
>> Date: Sat, 18 Apr 2020 11:30:25 +0000
>> Subject: Re: [TangerineSDR] Magnetometer Status 2020-02-13
>> Thank you, David. We will do that.
>> Dave Witten, Scotty, and Hyomin, I think we should make sure Dave McGaw
>> gets access to some of these to test, especially since he has access to
>> testing facilities and significant experience in this area.
>> 73 de Nathaniel W2NAF
> --
> TangerineSDR mailing list
> TangerineSDR at lists.tapr.org
> http://lists.tapr.org/mailman/listinfo/tangerinesdr_lists.tapr.org
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