Sending data over 300-400 m?

I want to make a PIC based wireless network where microcontrollers communicate with eachother. How to deal with interference? Which ready-for-use OEM modules can I buy? Any suggestions, tips of links?

Hi psmeets

Note that Microchip has a range MPUs call RF-PIC very nice for such
applications.

My regards

Hi,

Reaching 300 to 400 meters particularly with no line of sight will almost surely force you to transmit more power than is allowed without license, to get a reasonable data rate.
If you can accept a low data rate then you may try something like TR1000 from RFM or TRF6901 from TI.

Hi
I dont know if it will be of any use to you , but i made it with LPD device.
Unfortunately i didnt use any MCU cause i cant program. Instead i used
Motorola`s MC145026 and MC145027.
I think that this is perfect solution because it can work up to 1km , but if you need more you can allso use PMR device which has 500mW (2~3km) output power and it is very cheap.
Hope that helped you.

you can use a LPD transciever with fsk modem chip. You can take suggest from
hxxp://www.lorix.com/cat055_l2.php?n=1