Member Since: October 25, 2010

Country: United States

  • As Dan said, your milage WILL vary, but for anecdotal reference:
    I used these in a project transmitting a small data packet twice a second. The basics were:
    434 MHz, with 2.4 kbps data rate, GFSK modulation, 45 kHz frequency deviation, +20 dBm output power and these antennae:
    With the transmitters sitting on my desk, I got the receiver out the door of the office and about 200 m up the road before the signal dropped out (industrial area). That was more than sufficient for the project so I didn’t experiment much further. You’d probably do 50 to 100 % better with a 14 cm piece of wire on both ends for antennae, but my project was space-constrained.
    Higher over-the-air data rates will reduce power consumption but would probably reduce the range - by how much I couldn’t guess.
    SI Labs has an Excel spreadsheet that helps you work out a lot of the register settings. See the EZRadioPro Register Calculator under Design Tools:
    The radios I got were revision B1, but I got them direct from Hope RF before SparkFun started carrying them. I’m 90% sure SparkFun has revision B1 units. You can figure it out by reading register 0x01, which will return 0x06 in revision B1 units.

  • The transceiver chip the unit is based on (the SI4432) will do the full frequency range, but I’m pretty sure the other components on the board (antenna matching components) are tuned for the 433 MHz band.

  • Given the speed at which these went, maybe there’s a market for SparkFun to sell collections of common surface mounts parts. $10 bag of common 0805 resistors, $10 bag of common 0805 capacitors, $30 bag of common surface mount semiconductors etc.

  • Pretty sure they’re V2. Register 0x01 returns 2 on the units I have.

  • I’d love to know what settings / code you used to get this sort of range. With the SparkFun example code above I get ~30m. I can extend it a little by lowing the data rate right down but it’s still nowhere near 800m.

No public wish lists :(