Hi Vijay, Previously, I had never used values 1 and 2 for radio power transmissions, that's why I was surprised. Now I have made some tests with those values and I am getting very similar distances you have. I am surprised because of the great difference between using 1,2 or using 3.
Ruben vijay sankar escribió: > Hi Ruben, > > Can I know the range of values that you were getting with radio > frequency of 1 and 2. > > Thanks, > Vijay. > > 2009/12/1 Rubén Ríos del Pozo <[email protected] <mailto:[email protected]>> > > Hi Paul & Vijay, > > I am also interested in transmission power levels and transmission > range so I have been taking a look at the section Paul refers in the > CC2420 datasheet. However, I cannot see much interesting information > regarding transmission range. > > I am quite interested on these issues for indoor tracking so I need > short range communications. Do any of you have any experimental data > to share with me? Actually, I was quite surprised with Vijay's mail > concerning radio ranges with DCC2420_DEF_RFPOWER values of 1 and 2. > > Thanks in advance, > Ruben > > Paul Johnson escribió: > > Vijay, > > Please reference the CC2420 datasheet under the section "Output > Power Programming" for more details on the programmable > transmission power levels. > > Unfortunately, I doubt you will be able to find a transmission > power level that will precisely fit your needs. The CC2420 is > not going to be able to provide the transmission power level > granularity that you are wanting. > > Each time you quadruple the transmission power(6 dB power > difference), you are doubling your transmission range. The > listed figures on the datasheet show the minimum power levels: > 3, 7 and 11 gives -25 dbm, -15 dbm and -10 dbm respectively. > You cannot rely on the fact that values 4,5,6, etc increase the > transmission power linearly (or guarentee that the transmission > power increases and doesn't decrease). > > I have done some tests on the mica2 platform which uses the > CC1000 radio chip and found that going from transmission power > level 0xF to 0x10, I actually saw a decrease in transmission > power level. > > -Paul > > vijay sankar wrote: > > I am using the telos motes and tinyos1.x. > I want the radio frequency range to be within 200 to 400 cm. > I tried this CFLAGS+=-DCC2420_DEF_RFPOWER=1 with different > values. But for a value of "1" radio range is around 15-30 > cm and for a value of 2 it is around 50 cm and for a value > of 3 it is going beyond 5mt. > Can any one please let me know if I could set radio > frequency range around 200cm. > > Thanks, > Vijay. > > ------------------------------------------------------------------------ > > _______________________________________________ > 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 > > > -- > Ruben Rios > > -- Ruben Rios _______________________________________________ Tinyos-help mailing list [email protected] https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
