Thank you all, I think the transmission distance is also deeply effected by the environment. I use the same mica2 433MHz at the other places, I got about 60m, and for 900MHz mica2, I got 25m, but when I put everything to that site, the distance reduced to 30 m and 10 m respectively. I think that is because the grass, the tree and river absorb the signal and made it harder to listen to each other. I never use micaz before, is 2.4GHz has less inference from the environment? I think I definitely need use a high gain antenna, but should I move to 2.4G micaz or stay with mica2? Thank you again, and I will let you know the testing results.
Tony On 9/25/07, José Manuel Sánchez-Matamoros Pérez <[EMAIL PROTECTED]> wrote: > > I have used mica2 motes at 900MHz and i get more than 20 meters with a > mote on the ground. On this experiment we don't configure the mote at the > max power, so i think we can obtain a greater distance easily. > > Another think you must to check is the battery level. > > On 9/25/07, Jacob Sorber <[EMAIL PROTECTED]> wrote: > > > > Radio range will depend on how close to the ground you are. The range > > you are describing for your mica2's seems about right for a mote on the > > ground. If you can put them on a pole or in a tree, you will improve your > > range considerably. > > > > You might also want to look at the XE1205 radio on the tinynode (from > > shockfish). At 30kbps we've been able to get 500m+ near the ground and near > > water with the whip antennae they come with. They claim that you can get > > 1km+ with a data rate of 1.2kbps, but tinyos doesn't currently support > > any data rate under 30kbps. > > > > Jacob > > > > On 9/25/07, Demin Wang < [EMAIL PROTECTED]> wrote: > > > > > > We used 2.4GHz 8.5 dBi antennas on MicaZs and can reach maximum 400 > > > meters with the maximum transmission power. > > > > > > demin > > > > > > On 9/25/07, Tony Han <[EMAIL PROTECTED] > wrote: > > > > Hi folks, > > > > > > > > I try to use mica2 sending data for 100m in certain area (have a few > > > trees > > > > and a creek around), but now, with 900MHz mica2, I get only 10 m in > > > that > > > > environment, and if I use 433MHz mica2, I got 30m, still far less > > > than 100m. > > > > I use TinyOS 1.1.15. I set the transmission power to the maximum > > > value in > > > > MakeXbowlocal file. > > > > > > > > My question: is there any other "mote" has a longer range? or is > > > there any > > > > antenna can improve the TX and RX distance? > > > > > > > > I saw people deal with reduce the range for micaz, but please > > > someone help > > > > in increase the range. > > > > > > > > Thank you in advance > > > > > > > > Tony > > > > > > > > > > > > > > > > > > > > > > > > > > > > _______________________________________________ > > > > Tinyos-help mailing list > > > > Tinyos-help@Millennium.Berkeley.EDU > > > > https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help > > > > > > > > > > _______________________________________________ > > > Tinyos-help mailing list > > > Tinyos-help@Millennium.Berkeley.EDU > > > > > > https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help > > > > > > > > > _______________________________________________ > > Tinyos-help mailing list > > Tinyos-help@Millennium.Berkeley.EDU > > https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help > > > > > > > _______________________________________________ > Tinyos-help mailing list > Tinyos-help@Millennium.Berkeley.EDU > https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help >
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