I MIGRATED THIS DISCUSSION FROM WIRELESS - THIS EXPLAINS THE FOCUS OF THE FIRST PAGE
THIS IS the BEST (imo) Telemetry module out there currently !!!
This is a radio module that's small, fast, inexpensive, powerful, US legal 900mhz (and others). It has adjustable power output, spread spectrum frequency hopping, encryption, and TONNNNSS of other features. Also, at only $70 a pop (from digikey.com), they are Very easy on the wallet! especially compared to the digi xtend radio that is near $200 per. ouch!
I have three of RFM's DNT900 radios, and am working on Arduino programming to set-up and control them. I am working with the friendly tech at RFM who supports their products, and we are discussing a few more details about the needs of the radio. I intend to post more as I get farther along, and create a code block that people can copy-paste into their program to utilize this fantastic radio.
It has been a month, and I have just recently set up the architecture and got communication between two radios. I have them set to 200kb/s RF over air, allowing for up to 1watt of transmission power.
Still to go - i need to set up radio access lists, add 128 bit encryption, and adjust baud rate.
oh, and clean up the code! messy