2 Replies Latest reply on May 4, 2015 2:09 PM by Oliverleure

    WiFi range with N135 card on Galileo Gen1/2 <10m ?


      Hi Everyone,


      I'm trying to establish a communication between a Galileo board gen 1 or 2 (I have both) and a tablet through WIFI on a 20m distance using a N135 card. I have fine tuned the wifi channel (1-12) to prevent any interference with other WIFI signals. I have tried to use two different antennas with high gains (12dB). I also tried to adjust the transmit power: ie: iwconfig wlan0 txpower 30mW.(But it doesn't look like the WIFI card can handle multiple transmit powers...) So far I can connect my tablet but not further than 10m maximum, in outdoor.


      Did someone succeed to use WIFI over 10m using a gen 1 or 2 Galileo Board ? Am I limited by the WIFI card or the power delivered by the Galileo ?


      Thanks for any input,



        • 1. Re: WiFi range with N135 card on Galileo Gen1/2 <10m ?



          I tried to reproduce your issue. I am able to establish a connection between two gen 2 boards. They are approximately 15 meters away and the time of response increases as the boards get further away from each other as expected. However I am only able to test this in a lab so I’m not really sure how this would behave on an outdoor environment. I also tried to increase the tx power of the antenna using the same command as you did. Trying to increase the txpower gave no results because the value didn’t change when typing iwconfig wlan0, but when trying to decrease that value with iwconfig wlan0 txpower 10 I am able to change the Tx-Power to 10. So it seems that the Tx-Power is by default at its max. I guess this is because of security reasons and that this “Tx-Power=15 dBm” is the max tx power that should be used with this board to avoid malfunctioning. Some of the issues that might occur when increasing the tx above the default are overheating, more data errors and voltage drops that might lead to reboots.



          • 2. Re: WiFi range with N135 card on Galileo Gen1/2 <10m ?

            Hi Sergio,


            Thank you for your tests. I indeed think that the transmit power is limited by the WIFI card, especially for power saving purposes, on mobile devices. I will probably need to connect my board to a WIFI router (plugged on 220V) to increase the range of my signal.