The Chinese market TP-Link703n 150n USB router is a robust, small, low power and reliable router with many applications.
It is well loved around the world. It is truly diminutive in size and power needs.
It may be flashed from its TP-LINK Chinese firmware to TP-Links 3020 English firmware or DD-WRT or OpenWRT or OpenWRT based firmwares like Gargoyle and ROOter etc.
It is powered by 5 volts and supports a single 100Mb LAN/WAN port, a USB 2.0 port and a micro USB port for power connection.
The 703n has an internal inverted F ¼ wave length PCB etched antenna. There is no external antenna connection.
This tutorial documents the necessary modifications to add a standard RP-SMA antenna socket to the 703n.
This modification increases it's application and versatility considerably
The inspiration for this modification largely comes from these two blog articles:
See comments by luno
See comments by Diarmaid Ó Cualain
Tutorial (pdf) https://app.box.com/s/cispknq8b9zgog8k5vxn
Caution: It is very tiny inside and prior soldering skill on micro circuits is advisable; however these little things are tuff and can cope with a fair amount of wilful abuse.
Note: WIKI updated with this mod.