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] >> 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 -- Ruben Rios _______________________________________________ Tinyos-help mailing list [email protected] https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
