Low cost RF solution for midrange communication

Hi all,

I am new to working with RF communication, i am looking for a low cost RF solution that has a range of about 200 meters. Preferably a multipoint network.I am not looking for something with high data rates.

I have looked at the ZigBee modules 900Mhz series, but they are a bit on the expensive side. Does anyone have a suggestion or experience with such designs?

Thanks,
snadbox

To extend the range of typical Wifi, Zigbee or Bluetooth , directional antennas can help. For your case, I saw companies offering modified cell phones with SIM cards for their use as sensor network nodes. Google "sensor networks" , this field has recently developed quite rapidly.

I looked around for the sim card based sensor networks but could not find any, can you please post a link?

Try GENTAG.COM, or google "cell phone sensor network"