Just a few things I've not seen mentioned.
First of all in testing for this problem you may be helping to create it if you started out without any issue. The problem is the lugs that press against the antenna foil are not springs. If you depress them by testing, you will push the lug down, but it will not recover completely as a spring would, this causes a higher resistance connection.
I think HTCs design flaw is the lugs, they should have been springs to keep an even pressure applied and give or take with the back cover, but this would make assembly difficult with the way the front has to be partly slipped into place as springs would catch and might miss their target completely.
Two problems with the lugs I can see, the first is the polycarbonate case is giving slightly, and the lugs don't spring up to maintain the same contact pressure.
Second, anything depressing the back of the case (phone in pocket for example) is causing the lugs to bend down slightly, and as they are not springs they will not necessarily return back when the pressure is gone, hence testing for the problem could cause it. If the phone is kept in a pocket and the case is flexing even only slightly then the lug and contact pad might be moving against each other, even a tiny microscopic movement repeated for each step the owner takes would soon wear away the gold plating on the connections causing a less than stellar connection.
As we are talking about radio frequencies in the GHz range, it doesn't take much to make the contact appear as a high resistance if the pressure for the connection isn't maintain as designed.
The fix by soldering a wire to connect the two points for those brave enough to do it could cause the Wi-Fi transmitter to burn out prematurely. Connecting the wire is lengthening the antenna causing a mismatch between the antenna and the transmitter, this can cause some of the transmitted power to be reflected back to the Wi-Fi transmitter as a standing wave, which might cause longer term problems.
I suspect repairs that are working are simply the back removed, the antenna contact pins being bent back up and given a bit of a clean with Isopropyl alcohol for good measure before reassembly. This fix could be short lived if the conditions causing it haven't been addressed
tdnj wrote :dwang wrote:
HTC也懂天線門? 原XDA發文的都說這和IPHONE的天線門是不一樣的案例了. 原POST還請大家一定要搞清楚前因後果再在討論串發言, 不要用"SPEEDY READ"
擠壓是否會有影響? 對我兩隻是沒影響, 壓了也不會從2格變3格4格. 也不會讓我的3G WIFI sharing從下載3m變更快.
擠壓的科學根據是什麼? 至少xda原post要大家參考的philip發言有提到, 但同時我也可以質疑他經由人體手指的擠壓天線上方的面板,是否會助於wifi訊號的接收. 就像當你在聽手提收音機訊號不良時你只要去接觸天線就可以增強收訊一般, 相對的當有人從手提收音機前走過訊號就會被干擾, xda的post文只是告訴我有這種"現像", 除非經由更多測試才能確定這是不是"事實"
tdnj wrote :dwang wrote: