00:00.46 | Joerg-Neo900 | I'm not sure, but it doesn't matter in the end. PCB house gets picked according to what PCB grade we need (precision, resolution, vias etc) |
00:02.14 | Joerg-Neo900 | you build the PCB as "low tech" as possible (don't use sophiosticated stuff like stacked microvias, microtraces etc if not necessary), then when the layout is clear you find a PCB house that can do what you need |
00:04.53 | houkime | ok I guess for material -dependent calculations i will need to deduce a material that doesn't break the work that is already done. |
00:07.29 | houkime | and this time i will make documentation so that stuff never happens again. |
00:10.02 | Joerg-Neo900 | sounds good. Actual impedance-matched lines are done by the PCB house afaik |
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01:35.16 | houkime | fun things about gemalto. https://theintercept.com/2015/02/19/great-sim-heist/ |
01:38.04 | houkime | (now I do really want open silicon. Ideally self-made. Gonna sleep) |
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01:41.53 | Joerg-Neo900 | February 19 2015 |
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01:43.21 | Joerg-Neo900 | iirc what been stolen were the hidden pubkeys used to answer a auth challenge during log in, aka the Ki |
01:44.25 | Joerg-Neo900 | leaving the SIM cards that were involved vulnerable to cloning |
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01:56.51 | houkime | Actually now that I'm thinking about it, the most realistic solution would be to place a baseband processor on an FPGA. |
01:57.54 | houkime | FPGA should really eliminate all realisitical possibilities of silicon exploits, because no man can predict what you put in there beforehand. |
02:01.22 | houkime | So all one needs is to help osmocomm guys to hack gsm and then reimplement it as a design to load into FPGA. |
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17:10.03 | houkime | Ok, I investigated situation with rf taps. |
17:10.47 | houkime | Am i right that v2 will use U.FL SMT HIROSE connectors as taps like in v1? |
17:12.47 | houkime | and that i can borrow the footprints for them from tested v1 design? |
17:15.56 | DocScrutinizer51 | yes, Hirose sounds good and U.FL mifgt be correct |
17:15.56 | DocScrutinizer51 | teay wre in V1 right |
17:15.56 | DocScrutinizer51 | they* |
17:16.14 | houkime | the thing is that on v2 schematic there are 2 signal pins (and 2 gnd) for a tap. |
17:17.17 | houkime | so schematics needs to be updated for Hirose usage (correct pin names and such)? |
17:18.23 | houkime | schematics indicate 2 unnamed pins (inout), but hirose uses only one (and 2 GND) |
17:18.47 | houkime | v1 schematics is correct in this regard. |
17:18.51 | DocScrutinizer51 | I guess that's the reason. We need jack with switch (in-out) |
17:19.56 | houkime | ok, there's another jack in v1 and it has in-out. |
17:19.58 | DocScrutinizer51 | prolly nobody found / searched a matching component |
17:20.01 | houkime | it is a murata one |
17:20.20 | houkime | but murata has 4 GND pins |
17:21.12 | houkime | MM8430-2600RA1 |
17:22.58 | houkime | in v1 there was no jacks with switches on GNSS line, just hirose's but in v2 they should be with switches? |
17:23.02 | DocScrutinizer51 | do you understand the purpose of the jack? either internal or attached 'antenna' |
17:23.02 | DocScrutinizer51 | please choose an appropriate component |
17:23.02 | DocScrutinizer51 | sorry Im on mobile so can't search right now |
17:23.14 | DocScrutinizer51 | yes |
17:23.20 | DocScrutinizer51 | some shall |
17:24.29 | houkime | can you please be more specific? on v2 schematics all taps are identical. |
17:24.31 | DocScrutinizer51 | or even all, cant tell right now |
17:24.31 | DocScrutinizer51 | sorry I suffer disconnects here |
17:24.54 | houkime | ok |
17:28.37 | DocScrutinizer51 | sorry not now, I don't have access to schematics now |
17:28.37 | DocScrutinizer51 | use switched everywhere, optimaze later ;) |
17:29.33 | houkime | ok, will try |
17:29.51 | DocScrutinizer51 | ta |
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18:02.23 | Joerg-Neo900 | yes, for v2 we decided to sue switched ones everywhere |
18:05.44 | Joerg-Neo900 | houkime: I can't find MM8430-2600RA1 |
18:06.03 | Joerg-Neo900 | http://www.murata.com/products/catalog/pdf/o33e.pdf |
18:07.30 | Joerg-Neo900 | found it, 3x3mm |
18:08.00 | Joerg-Neo900 | wiw, 500 mating cycles |
18:08.07 | Joerg-Neo900 | wow even |
18:08.14 | Joerg-Neo900 | but "huuge" |
18:09.57 | Joerg-Neo900 | how about MM8930-2600 1.7^2mm |
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18:19.59 | atk | 500 mating cycles, as in it's rated to only be used 500 times? |
18:20.09 | atk | that seems awfully low |
18:20.21 | Joerg-Neo900 | it's a test jack |
18:20.26 | atk | oh I see |
18:20.34 | Joerg-Neo900 | they are often rated at 50 only |
18:20.57 | atk | so they sell the things which don't pass QC for a lower price as "test" grade? |
18:21.19 | Joerg-Neo900 | it IS test, as in "factory calibration" |
18:21.40 | Joerg-Neo900 | typically gets used one single time in product lifespan |
18:23.21 | Joerg-Neo900 | it's a 1.7x1.6mm 6GHz SWR-ratio <1.2 jack, no surprise the electrical properties might wear out after a small number of mating cycles |
18:23.46 | atk | Oh I see |
18:23.48 | atk | I get it |
18:24.45 | Joerg-Neo900 | it's not a SMA jack |
18:24.48 | Joerg-Neo900 | ;-) |
18:25.33 | Joerg-Neo900 | you need a 150$ SMA adaper to connect to that thing |
18:29.05 | Joerg-Neo900 | umm cheaper, only 30 bucks |
18:30.01 | Joerg-Neo900 | actually no https://www.digikey.com/product-detail/en/murata-electronics-north-america/MXHQ87PA3000/MXHQ87PA3000-ND/7926544 |
18:32.17 | Joerg-Neo900 | jacks wear out after 50 to 500 mating cycles - which none of them will see during normal product use. Probe lasts "forever" ;-D |
18:33.14 | Joerg-Neo900 | jack: 0.37USD, probe 136.26USD |
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19:06.08 | houkime | if we choose this we need to update schematics with 4 ground pins and make a footprint (probably based on catalog pdf). ok |
19:07.23 | Joerg-Neo900 | well, ok. We might need to update schematics, or we simply ignore the different GND pin count ;-) |
19:07.42 | Joerg-Neo900 | in footprint you can have multiple pads for same pin afaik |
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