It has different radio and Antenna. Micaz also has much less packet loss as compare to Mica2.
regards, -- Faisal Aslam University of Freiburg http://cone.informatik.uni-freiburg.de/people/aslam/ Akankshu Dhawan wrote: > Hi paul > Its strange i did similar tests with MICAz motes and even with default > transmission power I can get 10 meters. > > Akankshu > > On Thu, Dec 10, 2009 at 11:28 AM, Zhao Stephen <[email protected] > <mailto:[email protected]>> wrote: > > Dear Paul, > > Many thanks for your help. > Do you mean to set hex digits in SetRFPower()? It is interesting, > do you think it can not recognize decimal digits? > I should use SetRFPower(0xFF) on both receiver and > transmitter? Maybe it is no use for receiver. > > Best > Zhao > 2009/12/9 Paul Johnson <[email protected] > <mailto:[email protected]>> > > Zhao, > > My first thought, from running my own experiments is that it > has something to do with the transmission power. 9 m is about > what I would see with the mica2 in 900 MHz(it uses the same > hardware as 433 MHz, but a couple capacitor values are > different) when i set the transmission power to 0x02 (which by > the data sheet should be -20 dBm). > > However, there can be many reasons why the transmission range > is short. Are there any obstructions between the two motes? > Are you using the 433 MHz antennas (they should be somewhere > around 17 cm long, I don't remember off-hand, but the 900 MHz > whip antennas are approximately 8 cm long)? Are the antennas > oriented vertically on both motes? Are you aware of any other > devices operating in the 433 MHz frequency range? If the the > motes are battery powered, are they running low? How are you > setting the frequency, are you manually tuning or using a > preset? (If you are manually tuning, i recommend using one of > the 433 presets for control purposes) > > A couple of things I would recommend you try: > 1) Try using the default power level (0x80) <- hex, not > decimal and see what range you achieve. When chaning the > power level, make sure you only use values listed on the > CC1000 data sheet, otherwise you might get unexpected > results. i.e. Going from 0x0F to 0x10, you will actually see > a decrease in transmission power. > 2) Try a different pair of motes, it is possible that one > or both of the motes you used have hardware problems. The > antenna connector might not be fully soldered on, etc. > 3) Try the experiment in another location > > Hope this helps, > -Paul > > > > > On 12/10/2009 6:08 AM, Zhao Stephen wrote: >> Dear all >> >> I just test the rf coverage of mica2 in outdoor. two mica2 >> nodes are used, one is transmitter and the other is receiver. >> But the maximum range is around 9 meters, beyond that the >> receiver has no response. It is normal? In my setting, mica2 >> use 434Mhz and CC1000ControlM.SetRFPower(255). >> >> Why? >> >> Thanks >> >> >> >> _______________________________________________ >> Tinyos-help mailing list >> [email protected] >> <mailto:[email protected]> >> >> https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help > > _______________________________________________ > Tinyos-help mailing list > [email protected] > <mailto:[email protected]> > > https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help > > > > _______________________________________________ > Tinyos-help mailing list > [email protected] > <mailto:[email protected]> > https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help > > > > > -- > First they ignore you, then they laugh at you, then they fight you, > then you win. > - Mahatma Gandhi > ------------------------------------------------------------------------ > > _______________________________________________ > Tinyos-help mailing list > [email protected] > https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help _______________________________________________ Tinyos-help mailing list [email protected] https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
