frank26080115:
the new XTend modemhttp://www.sparkfun.com/commerce/produc … ts_id=9411
it has 40 miles line of sight, which is plenty for a high altitude balloon tracker, but it also costs almost $200 each, are there any matching receivers at a lower price? since I am only interested in having it transmit and not receive, I’d rather just pay more for a long range transmitter and a low cost receiver.
maybe http://www.sparkfun.com/commerce/produc … ts_id=9099 ?
I’m not sure what to look for when searching for the matching receiver, only that it needs to use Zigbee and 900mhz
All it needs to do is transmit GPS data
it’s all about choice of frequency, transmitter power, bandwidth, and antennas. High gain on the ground is of course more practical. We can do the math with some alternatives and get a high probability of what will work and what won’t.