Ramsheed, on 04 January 2013 - 08:12 PM, said:
Thanks for your reply.
I have tried Battery Calibration apps - is there anything more that can be done? I guess not..
I have tried the DNS from my router and the ISP, I will go back to the ISP DNS if that is the best one to use.
Mine is 4.1.1 Nov 26 so I'm assuming there isnt anything more recent in terms of firmware
With regard to the wifi fix, can plastic back covers be readily sourced? What would the antennae be replaced with?
For battery calibration, no. Likely a driver issue that has to be fixed in the firmware. ie. up to Yuandao to fix it.
I did not see any firmware newer for N90S. Though I have seen people report WiFi issues with 4.1 & 4.2 on other devices, like cell phones. Yuandao firmware can be found here (use online translation):
Firmware upgrade is the easiest thing to do. 2nd is changing out the antenna. You can search for some other antenna designs (home made) or for some internal ones. 5-9 dbi would be ideal.
Pictures of internal WiFi antennae in tablets (notice they are a cylinder with metal rod sticking out of it):
Trying to find who sells them will be kinda hard but they are out there to be bought. Also, avoid the ceramic ones because they are bad.
It maybe possible to modify your current WiFi antenna to work better. Look online for tips for improving antenna.
Plastic back cover (or cut out) is more in theory. Ie. you should be able to take back from another similar tablet, like N90-II, and get it to fit on N90S. Trying to find or get plastic back covers will be hard if not impossible. Cutting area around WiFi out is possible but you will need some type of thick, hard plastic to fit and glue into that area. Or maybe some type of copper metal/wire mesh that can fit in the cut out and you can glue or attach to metal back. Then find someway to connect your antenna to it to help boost the signal.
Use WiFi analyzer to measure signal strength. SpeedTest.net for download speed.
PS, I would suggest swapping out WiFi antenna or improving the current one. Though I would have to see 2-3 pictures of it to see if that is the problem or not. ie. no idea how good or bad the antenna is without seeing and having it tested out (without metal back).
PPS, also, carefully testing the tablet with back cover removed should reveal whether it was causing signal interference and by how much. Careful not to touch the PCB if you try this out. Keep hands only on tablet side. Maybe good idea to use a cardboard cutout on the back to avoid touching anything electrical inside the tablet. That should give idea of the affect the metal back is having on the signal.