[TangerineSDR] TangerineSDR Digest, Vol 17, Issue 15_PCboard comments

Fri Aug 7 10:36:49 EDT 2020

Regarding the en pin of the 9615, Spark Fun's board just lets this float 
... line goes to an EN pad on the edge connector.  Internal 300Kohm 
pullup on EN pin in the 9615.  In hundreds of power up cycles, I've 
never seen a problem with the SparkFun board.  Could be enough stray 
capacitance to satisfy the delay requirement.

Also, the data sheet discusses the 11ms in the context of both hot swap 
and power on.  In hot swap, most of that time is for debounce which is 
not the case in power on so it's somewhat confusing.

Dave's 0.0.10 2020-02-03 board has a 0.1uf cap to ground on the EN pin 
with a diode to the VddA pin to discharge the cap on power off to insure 
proper sequencing re the data sheet requirements. The 0.1uf cap gives an 
RC time constant of 30ms.
Jules-K2KGJ

On 8/7/2020 9:00 AM, tangerinesdr-request at lists.tapr.org wrote:
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> Today's Topics:
>
>     1. Re: Tangerine SDR uploading to PSK Reporter is working
>        (Dr. Nathaniel A. Frissell Ph.D.)
>     2. Re: MagnetoPi Hat schematic posted to TangerineSDR Documents
>        folder (Tom McDermott)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 6 Aug 2020 18:52:02 +0000
> From: "Dr. Nathaniel A. Frissell Ph.D."
> 	<nathaniel.frissell at scranton.edu>
> To: TAPR TangerineSDR Modular Software Defined Radio
> 	<tangerinesdr at lists.tapr.org>
> Cc: Gerry Creager - NOAA Affiliate <gerry.creager at noaa.gov>, "Engelke,
> 	Bill" <bill.engelke at ua.edu>
> Subject: Re: [TangerineSDR] Tangerine SDR uploading to PSK Reporter is
> 	working
> Message-ID:
> 	<MN2PR03MB5166F4D306EC4CD3E4D60BA6F2480 at MN2PR03MB5166.namprd03.prod.outlook.com>
> 	
> Content-Type: text/plain; charset="utf-8"
>
> That?s awesome!
>
> 73 de Nathaniel
>
> From: TangerineSDR <tangerinesdr-bounces at lists.tapr.org> On Behalf Of Gerry Creager - NOAA Affiliate via TangerineSDR
> Sent: Wednesday, August 5, 2020 4:35 PM
> To: TAPR TangerineSDR Modular Software Defined Radio <tangerinesdr at lists.tapr.org>
> Cc: Gerry Creager - NOAA Affiliate <gerry.creager at noaa.gov>; Engelke, Bill <bill.engelke at ua.edu>
> Subject: Re: [TangerineSDR] Tangerine SDR uploading to PSK Reporter is working
>
> Woot!
>
> Gerry N5JXS
>
> On Wed, Aug 5, 2020 at 15:33 Bill Liles via TangerineSDR <tangerinesdr at lists.tapr.org<mailto:tangerinesdr at lists.tapr.org>> wrote:
>
> Congratulations.  Nice.
> Bill, NQ6Z
>
> On Wed, Aug 5, 2020 at 4:06 PM Aidan Montare via TangerineSDR <tangerinesdr at lists.tapr.org<mailto:tangerinesdr at lists.tapr.org>> wrote:
> Very nice!
> ?
> Aidan Montare
>
>
> On Aug 5, 2020, at 3:43 PM, Engelke, Bill via TangerineSDR <tangerinesdr at lists.tapr.org<mailto:tangerinesdr at lists.tapr.org>> wrote:
> ?
> Gotta tell somebody about this.  Using IQ data from FlexRadio and the TangerineSDR simulator and local host,  I can now send spots to PSK Reporter.
>
> <image001.png>
>
> -73- Bill, AB4EJ
>
> PS. I know your question now, is ?what about WSPR??  -  arrrgh, I?ll get to it eventually
> --
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> Gerry Creager
> NSSL/CIMMS
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> The way to get started is to quit talking and begin doing.
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> Message: 2
> Date: Fri, 7 Aug 2020 05:59:28 -0700
> From: Tom McDermott <tom.n5eg at gmail.com>
> To: TAPR TangerineSDR Modular Software Defined Radio
> 	<tangerinesdr at lists.tapr.org>
> Subject: Re: [TangerineSDR] MagnetoPi Hat schematic posted to
> 	TangerineSDR Documents folder
> Message-ID:
> 	<CACO3nRT0G1PCao+KpVO9mFScPd=pq-jgHrqAMbkwQA7XAZpHiQ at mail.gmail.com>
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>
> Hi Scotty - I find the schematic difficult to understand because there are
> so many placeholders for things that are not implemented, but might be
> implemented in the future.
> Without knowing what the future is, why the further things are the way they
> are, what the various connectors might or might not do, it is nigh
> impossible to know what is done and why.
>
> So, ignoring all that, here are comments:
>
> 1. AVDD and DVDD are tied together on the PNI sensor board. Do these need
> to be separately decoupled?  Will noise on
> the DVDD mess up the AVDD signal?
>
> 2. I'm confused about Pin 6 (GND) of the RPI connector, pullup R10 and
> strap JMP4.
> The notes on the schematic aren't enough for me to sort all this out and
> what is going on here.
> Maybe a table would help.
>
> 3. Dave had an initial problem with the I2C differential driver/receiver
> where there was an RC delay needed. Assuming you are
> using the same component, I think this may have this problem.  U7, pin 2
> should not be tied to VCC but to an RC delay network.
>
> Here is my comment to Dave on January 27th:
>> The power supplies need to sequence up cleanly for the internal
> Power-on-Reset of the extender chip to initialize
>> properly.  The EN pin must be low during power stabilization then
> transition to high more than 11 milliseconds after power is applied.
>> The datasheet says that it is not allowed to transition high sooner than
> 11 ms after application of power. [Figure 6 of
>> the datasheet, section 7.4]. Since you have it hard-wired to +3.3V, I
> suspect this could be one problem. If you do
>> not have logic tied to this pin, then an RC delay circuit may be needed.
> I'd look at the Sparkfun circuit and see
>> how they do it.
> My recollection is Sparkfun did it wrong also...   When Dave fixed this it
> started working.
>
> -- Tom, N5EG
>
>
>
>
> On Tue, Aug 4, 2020 at 3:10 PM Scott Cowling via TangerineSDR <
> tangerinesdr at lists.tapr.org> wrote:
>
>> The final schematic of the Raspberry Pi Magnetometer Hat board is up in
>> the TangerineSDR documents folder.
>>
>> Before we pull the trigger on a proto build please take a minute to
>> review it and comment.
>>
>> This board is complete including layout and BOM, so hold any changes in
>> functionality for rev 2. We just need to make sure there are no errors.
>>
>> Several of you have seen this before and commented. I tried to include
>> all of your suggestions in this final version.
>>
>> So let's see how I did! :-)
>>
>> Here is the link:
>>
>> https://tangerinesdr.com/TangerineSDR_documents/MAGNETOPIHAT_SCHEMATIC_XA9.pdf
>>
>>
>>
>> 73,
>> Scotty WA2DFI
>>
>>
>>
>> --
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> End of TangerineSDR Digest, Vol 17, Issue 15
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