Monitoring airport Signal

I am using airport client monitor, my transmit rate is 54-Mbps, my signal strength is -60Db and the noise level is -95Db in this conditions my network works fine and I am near my airport express BS. If the strength signal drops to -80Db, I start having problems the transmit rate starts oscillating, going up and down(20 to 25-Mbps), and may stabilize at a lower transmit rate or after a while go back to 54-Mbps in this situation I am at six meters from the base station with a brick wall in between. Looking at the airport client monitor graphic there is a distance between the Noise and Strength curves about 10 to 12 Db.
Why I am having problems if I am only 6 meters from the AEBS? There is a graphic with a relation of distance from the AEBS and signal strength?
what is the relation of transmit speed, signal strength and Noise?
thank's
Luigi

I tried changing channels from automatic to 1, 2, 10 - all three of them showed the drop down to 0 every 25 seconds. That is not normal right? I got a slightly better signal at channel 2 but not by much. I also changed from b and g to g only. And increased the multicast to 5.5 and enabled Interference Robustness. And I got iStumbler and learned that my neighbor's open network is using channel 6. There is another closed network using channel 11. I currently have it set at chanel 2. What should I expect the numbers to be and is the transmission rate supposed to be a straight line up at the top and not dip down to zero on a regular basis? Also, I have an Airport Express running version 6.1. When I open Airport Admin Utility it asks me if I want to upload firmware 6.2 but I said cancel based on the posts I've seen in the discussions. Also, I have cox cable high speed internet and the tech guy that just came out told me that my BestData modem is notorious for dropping out and that I should buy a Motorolla 5120 modem. I just got one but haven't tried it yet to see if it made a difference. Before I did I wanted to learn how to monitor the signal so that I could see very specifically if it was improved or not. Also, after getting iStumbler I walked around the house checking the signal and right near the airport express I get a 60 and in the next room a 44 and then other parts of the house around 30 to 20 to 7 depending on where I go. Noise says 0. What should I try next? Also, just got a new phone 5.8 ghz instead of the old 2.4 and tried using the phone and it doesn't seem to have an effect one way or the other.
Also, are their any good sources for reading up on using the Airport admin and monitoring tools?
-charlene

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rmatile wrote:
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