Here is a simple and low cost design for the popular RF module of Maxstream X-Bee and X-Bee Pro
I have tested and work very well, I use it for transmit data from any rs232 DCT device, (such a GPS, GSM modems, data loggers etc.,)
to my computer up to 400 meter of distance!, the design translate the low levels voltajes
from/to 3v (Xbee) to emulated & well recognized PC levels,
in this zip I put all U need for build one ! even Gerber files !!
Enjoy !!Download the zip file 130k