Hi everyone,

Does signal attenuation depend on transmission power? Based on my limited
knowledge of physics, it does not. However, in measurement, noticeable
difference is observed.

For a sender and receiver, the measured signal attenuation of the link is *
56* dB when the sender transmits at power level *3* while the signal
attenuation for the same link is *57* dB at power level *31*.

Another related question, according to CC2420 datasheet, the tx power is
-25 dBm when power level is 3. Is the actual tx power equal to -25 dBm or
there is some variation depending on the specific hardware? How large is
the typical variation if any?

Look forward to your explanation. Thanks in advance.

-- 
-Xiaohui Liu
TelosB
TinyOS 2.1.2
www.cs.wayne.edu/xliu/
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