[TangerineSDR] TangerineSDR Digest, Vol 6, Issue 25

[Ward Silver]

I am on the road in New Mexico and will miss tonight and next week's
conference.  I hope to jump back in on the magnetometer discussion when we
get back in early October.

73, Ward N0AX

On Mon, Sep 23, 2019 at 7:57 AM <tangerinesdr-request at lists.tapr.org> wrote:

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> Today's Topics:
>
>    1. Re: TangerineSDR Board Sizes and Mock-up (John Ackermann.  N8UR)
>    2. Teamspeak Tonight (Nathaniel A. Frissell Ph.D.)
>    3. Re: Teamspeak Tonight (Phil Erickson)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sun, 22 Sep 2019 12:16:39 -0400
> From: "John Ackermann.  N8UR" <jra at febo.com>
> To: Rick - W2GPS <w2gps at cnssys.com>
> Cc: "Nathaniel A. Frissell Ph.D. via TangerineSDR"
>         <tangerinesdr at lists.tapr.org>
> Subject: Re: [TangerineSDR] TangerineSDR Board Sizes and Mock-up
> Message-ID: <061b13f1-e6e1-49ad-86a5-7aac4ca29786 at febo.com>
> Content-Type: text/plain; charset="utf-8"
>
> There may be multiple ways to get there and? I have a lot of experiments
> to do before I'l know if this ideawill work with the uBlox modules.? The
> complication is that none of the modules accept an external clock input so
> creativity will be required.? Sometime in the next few days I'll put
> together an initial description of the options.
>
> On Sep 22, 2019, 11:46 AM, at 11:46 AM, Rick - W2GPS <w2gps at cnssys.com>
> wrote:
> >John,
> >
> >I think we can make this work without "magic" by picking the right
> >OCXO, carefully adjusting the setup parameters in the M8F and possibly
> >adding a processor in series with the D/A to do additional filtering.
> >Nevertheless, your "magic" is interesting, too.
> >
> >Rick
> >W2GPS
> >
> >
> >-----Original Message-----
> >From: John Ackermann N8UR <jra at febo.com>
> >Sent: September 21, 2019 5:36 PM
> >To: Rick - W2GPS <w2gps at cnssys.com>; 'TAPR TangerineSDR Modular
> >Software Defined Radio' <tangerinesdr at lists.tapr.org>
> >Subject: Re: [TangerineSDR] TangerineSDR Board Sizes and Mock-up
> >
> >The "magic" I'm working on is whether we can use real time corrections
> >via internet or another mechanism to reduce the GPS noise.  It appears
> >we may be able to reduce the ADEV by an order of magnitude.  If we do
> >that, the loop time constant can be shorter which would allow for a
> >cheaper oscillator.  But there's still a bunch of testing to do to
> >confirm that and figure out a final design.
> >
> >On 9/21/19 5:00 PM, Rick - W2GPS wrote:
> >> John,
> >>
> >> I noticed the various layout examples in the SiLabs 53xx
> >documentation
> >> but I did not notice the 6-layer requirement. At present, the board
> >> stack is 4-layer, 80mm (0.31") thick to match the M.2 specification.
> >
> >> It is set up to match the stack-up requirements for standard
> >> configuration from low cost board houses like 4pcb.com. I just
> >checked
> >> and it will be easy to change this to 6-layer, 80mm (0.31") thick
> >> board while staying within their low cost board structure.
> >>
> >> I will need to find a low cost TCXO for the base configuration. The
> >> OCXO I show is well over $100 in 50-piece quantity. It can get to
> >> twice that if over specified.  I hope the footprints can be overlaid
> >to save room.
> >>
> >> The board size will be a challenge, I'm sure.
> >>
> >> Rick
> >> W2GPS
> >>
> >>
> >> -----Original Message-----
> >> From: TangerineSDR <tangerinesdr-bounces at lists.tapr.org> On Behalf Of
> >
> >> John Ackermann N8UR via TangerineSDR
> >> Sent: September 21, 2019 4:43 PM
> >> To: tangerinesdr at lists.tapr.org
> >> Cc: John Ackermann N8UR <jra at febo.com>
> >> Subject: Re: [TangerineSDR] TangerineSDR Board Sizes and Mock-up
> >>
> >> Thanks, Rick.  I've finally started paying attention and have been
> >> thinking about some unique GPSDO ideas.  They may change the physical
> >
> >> parts a bit but we're a long way from having anything finalized.
> >>
> >> I think we've concluded that the RF output from the M8F module is not
> >
> >> acceptable for RF use -- it has a very ugly dither pattern so we will
> >
> >> likely need a external (TC)(OC)XO and DAC no matter what architecture
> >
> >> we end up with.
> >>
> >> One thing to note: the SiLabs 53xx chip wants a 6 layer board and
> >also
> >> has some fairly funky layout requirements; a bunch of this is due to
> >> crosstalk reduction, and the 48 MHz crystal used as the cleanup
> >> oscillator.  The chip is physically small, but pretty complex to lay
> >out.
> >>
> >> 73,
> >> John
> >>
> >> On 9/21/19 4:24 PM, Rick - W2GPS via TangerineSDR wrote:
> >>> All,
> >>>
> >>> I have been working on the clock module to see if the proposed size
> >>> for
> >> the clock module is reasonable. Attached is a 3D top view showing
> >> major components. Not shown is the D/A to drive the OCXO and various
> >> minor components. These may wind up on the bottom of the board.
> >>>
> >>> Rick
> >>> W2GPS
> >>>
> >>> -----Original Message-----
> >>> From: TangerineSDR <tangerinesdr-bounces at lists.tapr.org> On Behalf
> >Of
> >>> Scotty Cowling via TangerineSDR
> >>> Sent: September 17, 2019 11:50 AM
> >>> To: TAPR TangerineSDR Modular Software Defined Radio
> >>> <tangerinesdr at lists.tapr.org>
> >>> Cc: Scotty Cowling <scotty at tonks.com>
> >>> Subject: [TangerineSDR] TangerineSDR Board Sizes and Mock-up
> >>>
> >>> Here is a sneak preview of part of the TangerineSDR talk I will be
> >>> giving
> >> at DCC on Saturday.
> >>>
> >>> Rick, this should be enough information on the PCB sizes to figure
> >>> out if
> >> we have enough room or not.
> >>>
> >>> The CKM can be extended downward and/or to the right (when looking
> >at
> >>> the
> >> assembly with the RPi I/O connector on top). We may have to make the
> >> DE board larger anyway, if our CAD guy needs more routing room.
> >>>
> >>> 73,
> >>> Scotty WA2DFI
> >>>
> >>>
> >>
> >>
> >> --
> >> TangerineSDR mailing list
> >> TangerineSDR at lists.tapr.org
> >> http://lists.tapr.org/mailman/listinfo/tangerinesdr_lists.tapr.org
> >>
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> ------------------------------
>
> Message: 2
> Date: Mon, 23 Sep 2019 12:18:00 +0000
> From: "Nathaniel A. Frissell Ph.D." <nathaniel.frissell at scranton.edu>
> To: TAPR TangerineSDR Modular Software Defined Radio
>         <tangerinesdr at lists.tapr.org>
> Subject: [TangerineSDR] Teamspeak Tonight
> Message-ID:
>         <
> BN8PR03MB472142E741110EBF5D3C33BAF2850 at BN8PR03MB4721.namprd03.prod.outlook.com
> >
>
> Content-Type: text/plain; charset="us-ascii"
>
> Hi all,
>
> It was nice seeing everyone at TAPR this weekend. I really enjoyed it, and
> I thought it was very productive.
>
> I'm not going to be on the Teamspeak tonight. I need to catch up on school
> work and spend some time with my family. I plan on being back next week.
>
> Enjoy your day and 73,
> Nathaniel W2NAF
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> ------------------------------
>
> Message: 3
> Date: Mon, 23 Sep 2019 08:56:58 -0400
> From: Phil Erickson <phil.erickson at gmail.com>
> To: TAPR TangerineSDR Modular Software Defined Radio
>         <tangerinesdr at lists.tapr.org>
> Subject: Re: [TangerineSDR] Teamspeak Tonight
> Message-ID:
>         <CAAZaqEtYr6ypGwNLHZQu5DqSG5TNOqLTNDDj2CSxFyYN1=
> JX4Q at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> Hi all,
>
> I was scheduled to show up and I will do my best to make it.
>
> Cheers
> Phil
>
> On Mon, Sep 23, 2019 at 08:18 Nathaniel A. Frissell Ph.D. via TangerineSDR
> <
> tangerinesdr at lists.tapr.org> wrote:
>
> > Hi all,
> >
> >
> >
> > It was nice seeing everyone at TAPR this weekend. I really enjoyed it,
> and
> > I thought it was very productive.
> >
> >
> >
> > I?m not going to be on the Teamspeak tonight. I need to catch up on
> school
> > work and spend some time with my family. I plan on being back next week.
> >
> >
> >
> > Enjoy your day and 73,
> >
> > Nathaniel W2NAF
> >
> > --
> > TangerineSDR mailing list
> > TangerineSDR at lists.tapr.org
> > http://lists.tapr.org/mailman/listinfo/tangerinesdr_lists.tapr.org
> >
> --
> ----
> Phil Erickson
> phil.erickson at gmail.com
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> Subject: Digest Footer
>
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> ------------------------------
>
> End of TangerineSDR Digest, Vol 6, Issue 25
> *******************************************
>
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