Description: Here is the breakout board for the RFM22B which gives you access to the pins. The RFM22B is a low-cost ISM (industrial, scientific, and medical) FSK (frequency-shift keying) transceiver module which offers communication at 434MHz and adjustable output power of up to +17 dBm. The wide operating voltage range of 1.8–3.6 V and low current consumption makes the RFM22 an ideal solution for battery powered applications.
Communication with the RFM22B is achieved via a standard 4-wire SPI interface. Three configurable general purpose I/Os are also available, the use of which can be tailored towards the needs of your project. A host of other features are also available including an 8-bit ADC, temperature sensor, RX and TX FIFOs, and low-battery detection. See the datasheet below for a complete description of every register and command.
In our testing, a 17cm wire attached to the ‘ANT’ pin worked just fine. A hole is drilled next to the ‘ANT’ pin for strain relief.
Dimensions: 0.63x0.63in (16x16mm)
Based on 1 ratings:
Frequency is within 2 KHz of nominal. Sounds good. We were able to hear it on My FT-817 and similar rigs up to 23 miles away, ONLY if there is a clear line of sight (no trees etc in the way). We placed transmitter on top of Mt Greylock in Western MA. This product is being used by FCC Licensed amateur radio operators. I believe you need to have a license to use this product. You may want to contact the American Radio Relay League http://arrl.org for more information.