The first off-topic post is mine reaction to Sebastian’s confirmation about difference in new batch hardware revision
https://forums.puri.sm/t/estimate-your-librem-5-shipping/11272/661?u=ppisa
As for the reaction, I have contacted Purism support with link to the referenced discussion and set of the questions
- confirm the problem and report actual best and average s/n percentage values observed in GPGSV records on samples from Evergreen production and even some discussion about results and modifications from previous models
- confirm, that warranty is not lost when phone is carefully disassembled (based on the official suggestion on the Purism web to disassemble phone and enhance earth contact)
- suggest what can be done on basis of your analysis
- provide vector/PDF version of components placement for the whole PCB board. You have used advertisement that even Xrays will be provided as antitamper protection. I understand that you do not want directly support cheap clones, I respect that your investment into design and software need reward. But you are canot cooperative with community when you complicate analysis of the problem a possible repairs.
- please document your intention in area of GNSS antenna circuitry. I have not disassembled phone, but schematics shows alternatives there. It seems that circuitry leading to TS3 SC-M1.4 (probably screw holding cover/frame) is clamped by two R 0 Ohms resistors. Is this main input of antenna, it seems that ANT3 ECT818000500 is not marked as NC. Is it assembled? Is there cable to USB-C board or elsewhere? I cannot locate corresponding connector on USB-C schematics a available photos of Evergreen are blurry. Side note again, why not to provide solid pictures and data to people who invested and get part of the adventure. My colleague from ESA points that even unconnected path to ANT3 connector can result in quarter wavelength reflection and degrade the signal. If signal goes through antenna then short circuit to TS3 can be a problem. So what is your level of RF knowledge about actual design.
No Purism response in the thread and response from support that they route request forward. No more response for longer time. My friend looked at photos and I have reported his finding in appropriate thread. Still no support response. I have opened phone and with help of hands of my company colleague I have managed to tune earth connection a little. I have reported results. After some time, response from the support with blurry screenshots from the PCB editor with some information that I can try to change some list of components. Without any technical background and problematic orientation because excerpt are quite small. No reply to any of my numbered questions. Then response of my colleague with deep GNSS knowledge what he thinks about reasons for changes and with doubts if that is the right things to do. No more response from support by e-mail or on the forum.
I am starting to consider this silence as intended officals answer more and more. It can be interpreted we are open only in the speech under advertisement articles but reality and value of the community is not valued for us.
Yes, I understand that you and Sebastian and many others are doing great job and that things are not black and white, but I have spent quite some time with attempts to be supportive and I think that others should know the results and consider if they should invest the time or not. And yes, I have quite lot of other things to do now… I can provide long list… So I have no economic or other problem to mark my time and money invested into Librem 5 as dead end for now on one hand… But I give it a chance for while still… or return when attitude changes…