Most often in my limited experience the noise level stays the same
throughout. Are there any 2.4 GHz phones in the area? How long is the
link in question? Do you have good line of sight? What are these
antennas mounted on? Have you done a frenel zone calculation? How high
off the ground are these? Is it related to weather/time of day/inversion
layer effect? Perhaps there is an interfering AP on a similar channel.
Connect the radios and antenna to your laptop and run netstumbler for a
quick and dirty site survey. Pick the least used channel.
Sean
Brad Langhorst wrote:
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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