hi every one ...anyone give me an idea about the follwing issue.....
there are two remote clients about 1 km from my access point .these two clients are in the same distance .the strange issue that one of the two clients is have very good link while the other is not the same of the first inspite the fact that both within the same distance
see the following images...
by the way. i changed the frequency but without change in the results...
what does that mean ?

You've got roughly 10dB difference between Tx and RX on both clients and also although they are the same distance, they have a 15dB difference in signal strengths. I would say it is a problem with the RF side itself, could be cards, coax, aerial... who knows without a lot more diagnostics and info from you. Could even be wideband interference. But would go with a physical RF problem to begin with.

Could even be wideband interference. But would go with a physical RF problem to begin with.

i dont know exactly..but i must check that client .give you the result
thank you very very much