If you are looking at options for using an cheap/low cost, long range RF module for purchase in India, then here is one RF transciever with incredible 4000ft/1.2km/1200m line of sight range. The module operates on +3.3V DC power supply and provides a robust RF link between the transmitter and the receiver.
The module is available for purchase in India at a price as low as Rs.900 /-. I am talking about the MRF24J40 zigbee transceiver based MRF24J40MB 2.4GHz long range RF module with onboard antenna, power amplifier and a SPI interface for communication with the microcontroller. The details of the module are given below,
The MRF24J40MB Zigbee module comes with an SPI interface, In order to use the module the user must initialise the device registers using SPI interface.
- Operating voltage: 3.3V (5V will damage the device)
- Range: 1020 meters/ 4000 ft
- Interface to microcontroller : SPI protocol
MRF24J40MB zigbee module is available for purchase in India
at Rs. 900 /- @ Mouser.com (To order from mouser.com check this link Where to buy electronics components in India?)