external aerial setup

Unanswered Question
Jan 21st, 2009

Hi all

I have a 1240 access point with an aerial plugged into the right bnc connector, the aerial is one of the omni directional tube devices that hangs off the ceiling.

My question is, how should this be set up on the ap, does it need to be in diversity mode or not as its only plugged into one side ?

please help


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Rob Huffman Wed, 01/21/2009 - 05:43

Hi Carl,

Diversity mode is only used with "two" Antennas. With one Antenna just use the Right hand "Primary" connector.

Hope this helps!


Rob Huffman Thu, 01/22/2009 - 07:04

Hi Carl,

Yes, this should be changed when only one antenna is used :)

Here are the commands to reset the Antenna settings to default,diversity (left-right) etc;


Use the antenna configuration interface command to configure the radio receive or transmit antenna settings. Use the no form of this command to reset the receive antenna to defaults.

[no] antenna {receive | transmit} {diversity | left | right}

Syntax Description


Specifies the antenna that the access uses to receive radio signals


Specifies the antenna that the access uses to transmit radio signals


Specifies the antenna with the best signal


Specifies the left antenna


Specifies the right antenna


The default antenna configuration is diversity


This example shows how to specify the right receive antenna option:

AP(config-if)# antenna receive right

Hope this helps!


srosenthal Tue, 01/27/2009 - 08:48

If you are using the omni that is designed to hang down from a ceiling, then you are using the wrong antenna for outside. That antenna can get water inside and cause you problems. You need to use the omni that is designed to be installed outside. It has the cable coming straight out of the bottom of the antenna. If yours has the cable coming out of the side of the aluminum then it is the wrong one for outdoor.

AIR-ANT2506 is for outdoor.

AIR-ANT1728 is for indoor.


Leo Laohoo Tue, 01/27/2009 - 13:09

Here are some links regarding Cisco wireless antennaes:

1. Cisco Aironet Antennas and Accessories Reference Guide


2. Cisco Aironet 2.4 GHz and 5 GHz Antennas and Accessories


Does this info help?


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