Ron K. Jeffries wrote: > ATBEN/ATUSB are not IMO "slow." that (cute) > term makes better sense applied to the radio technology > such as HopeRF that works in the lower freqiency > bands such as 800/900 MHz and indeed have low > throughput, maybe 50-100 Kbps while Werner's > radios can deliver a megabit or better per second.
IEEE 802.15.4-2006 specifies a data rate of 250 kbps for the 2450 MHz PHY, which is the PHY the AT86RF231 implements. (IEEE 802.15.4-2006 specifies a number of others PHYs, with characteristics less interesting for our purposes, there are companion documents with further PHYs, and they're still adding more.) Atmel's AT86RF231 implements non-standard high data rates of 500 kbps, 1 Mbps, or even 2 Mbps, which trades receiver sensitivity for speed. Each doubling of the data rate costs about 4 dB. (So if the maximum distance is limited by signal strength alone, then 2 Mbps would need 12 dB more than 250 kbps, which would reduce the range to about 1/4.) I measured that indoors range of 4-7 m with the standard data rate of 250 kbps. - Werner _______________________________________________ Qi Hardware Discussion List Mail to list (members only): [email protected] Subscribe or Unsubscribe: http://lists.en.qi-hardware.com/mailman/listinfo/discussion
