Cisco 1262AP external antennas configuration

Posted on 2012-09-06
Last Modified: 2012-09-17

I am using external antennas for my 1262 AP.  -5.2dbi on the 2.4g, and -6dbi on the 5g.

Is there a modified configuration on the AP I should be using for optimal performance and reliability?  Should I be using diversity, or should I choose which antenna transmits/receives?

Thank you,
Question by:chikagoh

    Author Comment

    Omni antennas
    LVL 5

    Accepted Solution

    For the MIMO AP, there A, B, and C connectors.  A and C are tx/rx, B is just RX.  Leaving diversity enabled will allow for the AP to change the primary antennas used and in an Omni antenna configuration 360 degrees this would seem the best approach as either A or C could be the better solution.   Essentially the radio will evaluate the sync signal of the packet on one antenna, then the other and evaluate.  Then the radio will select the best antenna and use only that antenna for the remaining portion of that packet.

    Where you wouldn't want to use diversity would be in a case where your trying to cover 2 cells with the same radio and the antennas are out of position with each other to such an extent that one of them will fail to connect.

    Author Comment

    If the antennas were too close to eachother, would this cause issue with interference or distortion when using diversity mode?
    LVL 5

    Expert Comment

    The guideline is to put matched antennas at a distance apart from each other that is equal to a multiple of the wavelength of the frequency that is being transmitted. The 2.4 GHz wavelength is approximately 4.92 inches. Therefore, to support diversity on a 2.4 GHz radio with two separate antennas, the antennas should be spaced approximately 5 inches apart. The antenna pair could also be spaced at multiples of 5 inches, but the distance between should not exceed 4 multiples.

    Author Comment

    Cool thanks.  This radio actually has 3 antennas, so I am assuming 4.92 inches between each of them in diversirty mode?  Or if I chose antenna 1 and 3 for the transmit, and antenna 2 for the receive, I only need 4.92 inches between 1 and 3, and then it wouldn't matter where antenna 2 is?
    LVL 44

    Assisted Solution

    by:Craig Beck
    The AP is actually designed with this in mind.  It does matter where the 2nd antenna is in relation to the other two, but when using antennas connected directly to the AP (as in rubber-ducks without a flylead, for example) they are already spaced correctly.

    If you were to use external antennas (with flyleads) you would need to consider this rule more closely to determine accurate placement.

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