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]> 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]> > > 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 >> [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 >> > > > _______________________________________________ > Tinyos-help mailing list > [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
