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0db vs 1db vs 3db for antenna diversity

 
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tacos123
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Joined: 21 Feb 2015
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PostPosted: Sat Feb 21, 2015 1:45 pm    Post subject: 0db vs 1db vs 3db for antenna diversity Reply with quote

if you have a receive diversity setup with 2 antennas, and the first can receive a signal to -100dbm and the second antenna (diversity) can read a signal also to -100dbm, then the combined receive would be -103dbm.

but what if the first antenna can receive -100dbm and the second antenna can receive -103dbm, now this is a problem, both antennas should be within 1db of each other? why is 3db delta bad?
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admin
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PostPosted: Sat Feb 21, 2015 7:25 pm    Post subject: Reply with quote

The combined sensitivity drops by 3 dB only if the signals are coherently combined, by the way.

There is no requirement that sensitivities need to be within 1 dB of each other. The lesser antenna just get less effective the farther the delta gets
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