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)
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I purchased this breakout board, looking to find a simple to use alternative to the the RF1100SE or more expensive NTX2B as an FSK transmitter. Big learning curve. Read the documentation. Do not expect the RM22 libraries to work out of the box. By default the power output 4h is set to higher than an Arduino UNO 3.3 volts can supply. I’ll be tweaking the library. I did get a successful RTTY transmission before it starts to reboot. Yes I’m taking the Technician level test soon! Google FCC Part 15 about low power unlicensed transmitters.
added 25Aug15 *****
Changing this to a 5 *****
I am using a Sparkfun level shifter between the board and an Arduino UNO
Functional RTTY test code can be found for the UK High Altitude Balloon Project.
REM: UK and Europe have different laws about generated radio transmissions and frequency use than the FCC USA.
Refer to Sparkfun’s data sheet but also the “Register” PDF from HopeRF the manufacturer of the board. Very handy when reverse engineering code (above). Register 6D’s last three bits sets the power level for transmitting.
I’m using an SDR (Software Defined Radio, 50 MHz to 1.3 GHz) dongle, Amazon/Ebay ~$20 USD to receive the signal using (free) SDR# software and decoding it using (free) Dl-figi software. Soooooooo sweet!
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.