Wireless Access

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Access network design for branch, remote, outdoor and campus locations with Aruba access points, and mobility controllers.
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AP-ANT-38: Cross or Co Polarization & Gain

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  • 1.  AP-ANT-38: Cross or Co Polarization & Gain

    Posted Jul 05, 2017 02:52 PM
      |   view attached

    Should the AP-ANT-38 with the IAP-224 be setup for cross or co-polarization? I can't find anything in the documentation.

     

     Additionally, what should the antenna gain be set to?



  • 2.  RE: AP-ANT-38: Cross or Co Polarization & Gain

    Posted Jul 05, 2017 03:46 PM

    Gain should be set to 7.5dBi. The antenna has 3 elements integrated in to the unit itself, and is already polarized (+45 / V / -45)



  • 3.  RE: AP-ANT-38: Cross or Co Polarization & Gain

    Posted Jul 05, 2017 04:26 PM

    Thanks! A couple of questions still.

    I'm on firmware 6.5.3.1. I've set the gain with the CLI but it only shows in the CLI, not the GUI. When setting in the GUI, it continues to show as zero:

    2017-07-05 15_58_21-172.17.30.14 - PuTTY.png

    2017-07-05 16_23_59-Instant.png

     

    I have tried in multiple browsers.

     

    What I was trying to ask with the polarization questions is what to select here:

    2017-07-05 16_25_11-Instant.png

     

     

    Thanks!



  • 4.  RE: AP-ANT-38: Cross or Co Polarization & Gain
    Best Answer

    Posted Jul 05, 2017 06:03 PM

    Ah, that's new, chose cross polarization. Not sure about the zero for gain, but the CLI is likley more reputable. I will see if anyone on my team has a 6.5.3.1 IAP with external connectors and if they see the same behavior.



  • 5.  RE: AP-ANT-38: Cross or Co Polarization & Gain

    Posted Mar 15, 2018 09:18 AM

    Is AP-ANT-35A also cross polarization ?

    Cant find anything in the documentation :(

    Also my webgui shows 0 all the time regardsless of reboot or not. And my cli shows the value I input, in this case 5.0



  • 6.  RE: AP-ANT-38: Cross or Co Polarization & Gain

    Posted Jun 26, 2018 02:27 AM

    Any way to get an official answer on this ? Wich antennas to choose cross for and wich to choose co for ? Very confusing to introduce a new option in the GUI and not in any documentation on the antennas.



  • 7.  RE: AP-ANT-38: Cross or Co Polarization & Gain

    Posted Jun 26, 2018 03:03 PM

    All Aruba panel antennas are cross-polarized. All others are co.



  • 8.  RE: AP-ANT-38: Cross or Co Polarization & Gain

    Posted Jul 02, 2018 05:42 AM

    Cool thanks.

     

    Maybe aruba should clarify this more in documentation, I asked around and nobody seems to know 100%.



  • 9.  RE: AP-ANT-38: Cross or Co Polarization & Gain

    Posted Jul 02, 2018 03:05 PM

    Datasheet is indeed not very clear, but states:

    Polarization: V, and slant +/- 45 degrees.



  • 10.  RE: AP-ANT-38: Cross or Co Polarization & Gain

    Posted Jul 02, 2018 03:06 PM

    Datasheet is indeed not very clear, but states:

    Polarization: V, and slant +/- 45 degrees.


     

    How does this indicate cross- or co-polarization?



  • 11.  RE: AP-ANT-38: Cross or Co Polarization & Gain

    Posted Jul 02, 2018 05:00 PM

    Co-polarization would require all antennas to have the same orientation.



  • 12.  RE: AP-ANT-38: Cross or Co Polarization & Gain

    Posted Sep 12, 2019 05:18 AM

    Sorry, In your early post, you said "All Aruba panel antennas are cross-polarized. All others are co."

     

    But same orientation type is panel anteena, maybe I am wrong?



  • 13.  RE: AP-ANT-38: Cross or Co Polarization & Gain

    Posted Oct 01, 2019 06:17 AM

    What I think he meant is the panel antenna is built of three different antenna elements with different polarization.This is why Aruba refer to them as cross polarized instead of if you use three identical dipole antennas, which they refer to as co-polarized.

     



  • 14.  RE: AP-ANT-38: Cross or Co Polarization & Gain

    Posted Nov 13, 2019 01:24 PM

    Good thread. For clarification, with respect to selecting appropriate "External Antenna Polarization" parameter for each frequency, if the antenna used is from Aruba we should select "1-Cross-Polarized"? (pic attached)

     

    Running AOS 6.5.x now, recently upgraded from AOS 6.4.x. In 6.4 there there was no such parameter. The default appears to be "0-CO-Polarized".

     

    We have thousands of AP-324s deployed. Most use the 1W antennas. believe the antenna orientation is 45 degrees away from the AP.

     

    Polarization.png

     



  • 15.  RE: AP-ANT-38: Cross or Co Polarization & Gain

    Posted Nov 13, 2019 01:37 PM

    ANT-1W (direct mount omni dipoles) should be oriented vertically and all parallel, to provide matching coverage patterns.



  • 16.  RE: AP-ANT-38: Cross or Co Polarization & Gain

    Posted Nov 13, 2019 01:39 PM

    Yes understood! We're aware of that and are working to hopefully correct it. I'm more interested in knowing the correct setting of "External Antenna Polarization".



  • 17.  RE: AP-ANT-38: Cross or Co Polarization & Gain

    Posted Apr 20, 2020 11:10 AM

    Hello, 

     

    Same question with ant-16, what we should use :  cross or co-polarization in GUI ? 



  • 18.  RE: AP-ANT-38: Cross or Co Polarization & Gain

    Posted Apr 20, 2020 06:19 PM

    Multiple parallel oriented ANT-1W antennas are co-polarized.

    Same is true for the elements in ANT-16.