long range data transfer

Depends on local infrastructure, application and budget. GPRS. GSM. WiFi. Argos. VSAT to a variety of birds.

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Hi All I found this:

Mine has wheels .... Rail gun would probably kill the electronics. Pneumatic hard drive launcher? Trebuchet works well but that's a long distance to travel. Safe and intact landings are another problem.

I used one of their short range radio modems. It worked pretty well, but I only used it for a few hundred feet tops. With 900mhz and especially 2.4ghz the range depends a lot on good antennas and line-of-sight. With properly aligned high-gain antennas that can see each other 10km should be easy. With omni antennas and obstructions, I doubt you'd get more than a few kilometers even with their high-power stuff.

-chris

Use a pair of cheap cell phones. World wide range. There is a bandwidth limit but hey...

Cheers!

Sir Charles W. Shults III, K.B.B. Xenotech Research