gsm modem

[Gina Mckee]

i have 2 siemens t35 gsm modems.i have managed to get them to send gps data from one to the other.my question is if anyone can help is how would one perform if fitted to an model aircraft sending its gps position back to the ground station.my main concern was interference with the 72 mhz pcm receiver......g

[george]

Have anymore info on the modems? Where'd you buy them?

[Tom]

I think you can find these on Ebay, but I don't think they work on U.S. GSM frequencies.

[Gina Mckee]

thank you guy's i have decided to ditch the gsm modems and send the data back from the aircraft on the video stream..thanks for your reply

[Aarij Rasheed]

It's really nice to see that you have decided to use live-streaming option to communicate with your drone ...But can u tell me which kind of camera you used for live-streaming ?? Is the weight of camera matters here ?? and i also want to find out the model number of GSM kit, so that i can communicate to my drone via that kit and can change its co-ordinate through that...

[Kim Skatun]

use bluetooth and a normal phone........

[Gina Mckee]

Hi,well the camera is just a small pal or ntsc micro camera, the video is then added to a COFDM down link which can also carry the GPS data and audio from the aircraft. I equired about the gsm modems which work fine on the ground but i belive they could be unreliable at altitude because gsm base antennas are set for ground use.I have opted for a standard futaba r/c system and added a 30 watt pa stage to increase the transmitters range.I opted for 72 mhz because it is almost within the radio amateur 6 meter band .The pa cost 80 UK pounds sterling as a kit and the antenna is a standard radio amateur 6 meter band antenna .Range testing is about to commence when i get back to the UK ...Thank you all to the replies Gina