The TP-Link USB cable works fine with my 3220 router and E1820 stick. The signal strength increased from 77% to 87% and the bonus is that two heat sources are now seperatedI have the router connecting the 3G stick on demand and have had up to 3 wireless devices active simultaneously. No disconnects or throughput problems.
I also plugged the extension into my pc and it also worked fine. I wanted to see what 87% translated into in db and saw -55 in the Cell C tool diagnostics.
Thanks, will keep that in mind