Custom calypso board

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Harald Welte laforge at
Wed Jul 11 23:03:32 UTC 2012

Hi Mathias,

On Wed, Jul 11, 2012 at 10:00:10PM +0200, Mathias K. wrote:

> Your plan to use a 1.00mm thickness instead of the default 1.55mm
> increase the price by around 50% on, as example, WEdirekt. Why you
> need this thickness? Most time this is really useless and only
> increase the board costs. You should also think about bending, bga
> and small thickness.

I want to use a known 6 layer PCB stacking of materials / thickness that
we know works with the Calypso/Iota/Rita.  Particularly on the RF side,
I don't want to spend time re-calculating all the impedance matched /
controlled parts.  That's the part that is hard to measure if we get it
wrong.  So just do the safe thing and stay with the "known working"


- Harald Welte <laforge at> 
"Privacy in residential applications is a desirable marketing option."
                                                  (ETSI EN 300 175-7 Ch. A6)

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