[TangerineSDR] TangerineSDR Board Sizes and Mock-up

[John Ackermann N8UR]

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
> 
>