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<azonenberg>
So i heard back from Sonnet support
<azonenberg>
no definite answers yet but i'm trying to track down the sources of my sim-hardware mismatches so i can do better modeling of connector launches in the future
<azonenberg>
we're probably going to have a call tomorrow to discuss in more depth
<azonenberg>
in the meantime, i managed to import the actual kicad geometry (with some simplification of vias down to big boxes) into sonnet and i'm trying to model the whole thing
<azonenberg>
the first attempt wanted to use 10 GB of RAM, my edition is only good for 128 MB. I managed to get it down to 111 MB with some finagling
<azonenberg>
So we'll see if this looks like my original model or if it's closer to what i saw in the VNA
<azonenberg>
Also continuing to make progress on the TCP code. I'm hopeful that within a day or so i will have "optimistic TCP" functional
<azonenberg>
i.e. it won't retransmit dropped packets, but will work fine as long as you never drop anything
<azonenberg>
not useful for production of course, but will be good enough for preliminary bringup testing
<bvernoux>
exactly the same but placement shall be simpler
<bvernoux>
and I suspect the price is the same when bought from Powell Inc
<bvernoux>
hmm 142-0771-821 version is 6USD min at Powell
<bvernoux>
So I will probably keep the other ;)
<bvernoux>
142-0771-831
<bvernoux>
I need to do more tests anyway
<bvernoux>
I have received the glue and I shall assemble my TRL Board v0.1 using OSHPark FR408HR 4Layers
<azonenberg>
I think i'm gonna try the amphenol one and see how i like it. yes, it looks like placement might be a bit tricky
<azonenberg>
But it depends on how snugly it fits
<azonenberg>
The samtec part will not move, at all, once you slide it on, it seems to be a slight interference fit
<azonenberg>
so i put it on, jiggle it a bit to make sure it's centered, then just push on
<lain>
wiggle wiggle
<bvernoux>
my issue is also OShPark PCB are too thin ;)
<bvernoux>
expected to be 1.6mm and they are 1.5mm ;)
<bvernoux>
1.56mm in fact ;)
<bvernoux>
OShPark specify 4 Layers to be 63mil (1.6mm) nominal
<bvernoux>
but they do not provide tolerance
<bvernoux>
and I see clearly 0.04mm less than 1.6mm
<bvernoux>
so 15mill less is not good for the thickness and to connector SMA as they are loose...
<Degi>
Hmh yeah, I think its like 0.05 mm tolerance? At least at jlc
<Degi>
Oh, its +- 10%
<Degi>
JLC says "min. BGA 0.3 mm" but 0.8 mm kinda pushes their limits?
<Degi>
Maybe for single layer
<Degi>
Nice @TCP
<Degi>
I think it should be possible to make the pos. and neg. rails with a two or three winding transformer instead of an inductor and a synchronous PWM buck converter