RFM12B 868 MHz
The RFM12B radio module by HopeRF is a compact wireless radio module for sending and receiving packets on the 868 MHz ISM band using FSK. There are two variants, the -S1 series with a metal can crystal and the more expensive -S2 type using a low profile, SMD crystal. We supply the height-saving SMD crystal type.
This module is used as standard by all JeeNodes and JeeLinks. It is controlled via the SPI bus, and works with a power supply level of up to 3.8 V.
An antenna must be connected to the module – for 868 MHz, an 82-mm piece of wire can be used (quarter wavelength).
For a breakout board for this module with a 5V option, see the RFM12B Board.
The Modern Device shop has 915 MHz modules at US$ prices.