Last weekend i dragged the whole setup to the flying field. After 10 meters the control became intermittent. How is this possible after the successful earlier tests? On the flying field there is no power available so i could not use the ground station i built. So i used the WiFi adapter from the FTU with a laptop and a "Micro" USB WiFi adapter. That didn't work.

Today the WiFi adapter i ordered came in the mail and i have been testing it.

Using wavemon i found the adapter was performing around the same as the built in adapter in my laptop. The transmit power reported was 100mW.

The reason i bought this specific adapter in china was because it had the following features:

• Small and light
• RP-SMA connector
• 1000mW tx power

So where are my 900mW?

So the maximum allowed transmit frequency is not the same in every country. This is controlled by the driver of your network card. To change this in most linux distributions use the following instructions.

First find the name of your card with ifcofig. Usually this is wlan0. Replace NAMEOFYOURCARD in the following commands with with the name of your card and run the following commands:

sudo ifconfig NAMEOFYOURCARD down

sudo iw reg set BO

sudo ifconfig NAMEOFYOURCARD up

When checking in wavemon again the tx power was 500mW. Much better. Power saving was still enabled and i think disabling that will let the full 1000mW out of the box. I wasn't willing to try this yet without first having a good power supply.

Bye!