Two different antennas on one access point

Answered Question
Jan 19th, 2010
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Hi all,


I know that two different antennas connected on one access point are not supportet by Cisco.

Unfortunately I don't find the document where this scenario is described.


Does anybody know which document describes this solution?


Thanks

Martin

Correct Answer by George Stefanick about 7 years 5 months ago

your are correct. It is not recommend in fact it would make no sense as it would defeat the purpose of diversity. If one antenna gain is greater then the other your stronger antenna will likly always be favored for tx



Diversity

Diversity is the use of two antennas for each radio, to increase the odds that you receive a better signal on

either of the antennas. The antennas used to provide a diversity solution can be in the same physical housing

or must be two separate but equal antennas in the same location. Diversity provides relief to a wireless

network in a multipath scenario. Diversity antennas are physically separated from the radio and each other, to

ensure that one encounters less multipath propagation effects than the other. Dual antennas typically ensure

that if one antenna is in an RF null then the other is not, which provides better performance in multipath

environments (see Figure 3). You can move the antenna to get it out of the null point and provide a way to

receive the signal correctly.


http://www.ciscosystems.or.at/application/pdf/paws/27147/multipath.pdf


hope this helps... please rate the post if you find this helpful


thanks

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Correct Answer
George Stefanick Fri, 01/22/2010 - 23:54
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your are correct. It is not recommend in fact it would make no sense as it would defeat the purpose of diversity. If one antenna gain is greater then the other your stronger antenna will likly always be favored for tx



Diversity

Diversity is the use of two antennas for each radio, to increase the odds that you receive a better signal on

either of the antennas. The antennas used to provide a diversity solution can be in the same physical housing

or must be two separate but equal antennas in the same location. Diversity provides relief to a wireless

network in a multipath scenario. Diversity antennas are physically separated from the radio and each other, to

ensure that one encounters less multipath propagation effects than the other. Dual antennas typically ensure

that if one antenna is in an RF null then the other is not, which provides better performance in multipath

environments (see Figure 3). You can move the antenna to get it out of the null point and provide a way to

receive the signal correctly.


http://www.ciscosystems.or.at/application/pdf/paws/27147/multipath.pdf


hope this helps... please rate the post if you find this helpful


thanks

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