I've built a small community wireless network 
One central AP with 2 radios
One is for clients, the other is a backhaul link to a dedicated access
point that connects to the firewall and the internet.

I'm using smc radios (prism chipset - 200mW 1.7.4firmware, hostap) and
panel antennae on both sides of the backhaul link.

i see signal levels between -40dBm and -60dBm (20!db?)
the noise level is almost always static at -92dBm

The link quality metric is extremely variable  - going between 
90 and ~0 dB

here are the graphs
http://charterstreet.dyndns.org/rrd/

Sometimes i actually lose the connection 

What could explain 
1) the wild variation in "Link Quality"
2) the less wild but still very big variation in signal level..

obviously link quality depends on signal level but there's certainly
something else in play. the noise level seems to be useless




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