Sometimes the 3G signal are week, we can make something very easy to improve the signal.
We can build a parabolic around the pen 3G.
I used a ring of copper and connected to the center with 4 copper wires, revested with aluminum foil to put.
Wireframe and positioning of the antena (left) and Parabolic antena for pen 3G (right)
Using this antena I could get a gain around 2dB.
I had used the command AT+CSQ to determine the signal power.
3G connection properties
3G power signal
+CSQ: <rssi>,<ber>
where
<rssi> - received signal strength indication
0 - (-113) dBm or less
1 - (-111) dBm
2..30 - (-109)dBm..(-53)dBm / 2 dBm per step
31 - (-51)dBm or greater
99 - not known or not detectable
<ber> - bit error rate (in percent)
0 - less than 0.2%
1 - 0.2% to 0.4%
2 - 0.4% to 0.8%
3 - 0.8% to 1.6%
4 - 1.6% to 3.2%
5 - 3.2% to 6.4%
6 - 6.4% to 12.8%
7 - more than 12.8%
99 - not known or not detectable
DisclaimerI am not associated to any kind of brand.
I claim no responsibility if you damage your gear, electrocute yourself, inflict or receive any harm or misfortune.
By undertaking this guide you do so at your own risk.
Whilst I have made every best effort to insure that these instructions are accurate, given the fact I am not a professional there may be errors. If you find any please let me know.
Let's get onto the building :)
Have fun
