"jmc...@gmail.com" writes:
> For signal (signal1, signal2, etc..), I have link-quality (0-255) and dBm
> (negative values).
I don't mean to contradict anything already said, but it's good to
understand that dBm means dB relative to 1 mW (milliwatt, 10^-3 W),
which is the standard way to measure RF power. While calibration is
hard, it is entirely sensible for a receiver to measure signal strength
in dBm. As an example -30 dBm means 30 dB, which is 3 B, which is 10^3
= 1000 less than 1 mW, which means 1 uW. As a received signal strength
this is huge.
The smallest signal strength that works depends on the modulation and
data rate. A very rough notion of a minimally workable signal strength
might be -100 dBm. Take that with a huge grain of salt.
Also realize that much equipment isn't calibrated or close, so this is
all relative more than it should be. But typically, relative values
from the same receiver can be compared.
Some stations (Davis) report something that is more or less % of recent
transmission that were received. This is correlated with strength but
is fundamentally different. In RF data networking, what really matters
is if packets are received.
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