How to improve 2.4 Ghz sensitivity and output power (EIRP) on TP-Link TL-WDR4900v1 (N900)
This router is quite old but it is very powerful:
PowerPC CPU @ 800 Mhz, 16 Mbytes of flash, 128 Mbytes of ram, 2x2.0 USB ports, 1 Gigabit/s ethernet, OperWRT fully compatible.
This router has 6 MIMO antennas, three external (5 Ghz 5 dB) and three internal (2.4 Ghz about 2 dB)
Since I don't use 5 Ghz at the moment, but only 2.4 cause I use this router to connect to my internet provider with a Python script.
The actual signal is just -76 dBm (50%) and so the internet speed obtained is only 5 Mbit/s down/up, any dB gained will mean some more megabit/s gained
My plan is to exchange internal connections by desoldering the wires, exchange and solder them again to have the 3 external antenna connectors connected to the 2.4 Ghz module, then I want to use three 5 dB (or more) external antennas designed for 2.4 Ghz.
The right section is the 2.4 Ghz radio module (gray wires), the left one is the 5 Ghz module (black wires).