RF22

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SDRSharp_20130304_095231Z_433999kHz_AF.wav

This is an audio .wav file of a typical transmission from an RF22, driven by the RF22 library. The RF22 was configured for the default: 434.0MHz, FSK_Rb2_4Fd36 (ie FM, 36kHz deviation, 2.4kbps) It was captured with a Funcube Pro+ dongle, using SDR# software. SDR# was configured for a centre frequency of 434.000MHZ, WFM mode with a filter bandwidth of 100kHz (wider than necessary to capture the 36+36 = 72kHz deviation of the signal) With a wav file viewer such as audacity, the modulation can clearly be seen, consisting of:

- Preamble of 8 nibbles (16 cycles)
- 2 Sync words 0x2d, 0xd4
- 4 bytes TX header (all 0s, this was a broadcast)
- 1 byte packet length
- payload
- 2 bytes CRC (IBM format)