[TangerineSDR] TangerineSDR Digest, Vol 31, Issue 3
Julius Madey
hillfox at fairpoint.net
Sun Oct 3 17:19:18 EDT 2021
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.
JM
On 10/3/2021 3:48 PM, tangerinesdr-request at lists.tapr.org wrote:
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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 <hillfox at fairpoint.net>
> To: Bill Owens <owens.bill at gmail.com>, TAPR TangerineSDR Modular
> Software Defined Radio <tangerinesdr at lists.tapr.org>
> Subject: Re: [TangerineSDR] TangerineSDR Digest, Vol 31, Issue 1
> Message-ID: <7f91e2b7-f618-4877-71e3-239d6e5d2744 at fairpoint.net>
> 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
>
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> On 10/2/2021 11:36 PM, Bill Owens wrote:
>> 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
>> <tangerinesdr at lists.tapr.org <mailto:tangerinesdr at lists.tapr.org>> 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, tangerinesdr-request at lists.tapr.org
>> <mailto:tangerinesdr-request at lists.tapr.org> wrote:
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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."
>>> <nathaniel.frissell at scranton.edu> <mailto:nathaniel.frissell at scranton.edu>
>>> To:"tangerinesdr at lists.tapr.org" <mailto:tangerinesdr at lists.tapr.org> <tangerinesdr at lists.tapr.org> <mailto:tangerinesdr at lists.tapr.org>
>>> Subject: [TangerineSDR] FW: [HamSCI] Two questions about the new TAPR
>>> magnetometer board
>>> Message-ID:
>>> <BLAPR03MB5540044997C2145BB6D46D2AF2AB9 at BLAPR03MB5540.namprd03.prod.outlook.com> <mailto:BLAPR03MB5540044997C2145BB6D46D2AF2AB9 at BLAPR03MB5540.namprd03.prod.outlook.com>
>>>
>>> Content-Type: text/plain; charset="us-ascii"
>>>
>>> Hi,
>>>
>>> I'm sending these questions from Bill N2RKL to the TangerineSDR list. They were originally posted on the HamSCI list.
>>>
>>> 73 Nathaniel
>>>
>>> From:hamsci at googlegroups.com <mailto:hamsci at googlegroups.com> <hamsci at googlegroups.com> <mailto:hamsci at googlegroups.com> On Behalf Of Bill Owens
>>> Sent: Thursday, September 30, 2021 9:22 AM
>>> To: HamSCI<hamsci at googlegroups.com> <mailto:hamsci at googlegroups.com>
>>> 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 <http://hamsci.org/hamsci-community-participation-guidelines><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=T
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