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.
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