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Regular Contributor I

External antenna gain value when provisioning

Hi all,

 

The antenna gain specs for the AIR-ANT-1B are 3.8 dBi (2.4GHz) and 5.8 dBi (5GHz). The AP provisioning page on the controller will only allow gain values in .5 dBi increments. There is also this tidbit taken from the AP-22x data sheet:

Antenna-info-AP-22x.png

Does this mean the gain values for the AIR-ANT-1B should actually be 2.3 dBi (2.4GHz) and 2.8 dBi? And, if I must enter this in .5 dBi increments, should I round down or up?

http://www.arubanetworks.com/pdf/products/DS_AP220Series.pdf
http://www.arubanetworks.com/pdf/products/ap-ant-1b_ss.pdf

Thanks,
Mike

Re: External antenna gain value when provisioning

I would do 3.5dBi and 5.5dBi (round down to the nearest 0.5dBi). If you are US, you don't need to account for the diplexer loss unless you just want to as you shouldn't be anywhere near the regulatory limits (so 2.0dBi and 2.5dBi provisioned acounting for the diplexer loss).

 

Hope that helps. 

Jerrod Howard
Sr. Technical Marketing Engineer
Regular Contributor I

Re: External antenna gain value when provisioning

Thanks Jerrod,

 

Needing to get these online I set them at 4.dBi and 6dBi, so I rounded up. Would that be ok or do you reeccommend rounding down? This is for a classroom building in a campus setting and some classrooms have fairly high density seating capacities.

 

Mike

Re: External antenna gain value when provisioning

Going up you're fine then, again, you likely won't get near any regulatory limits so you should be fine...

Jerrod Howard
Sr. Technical Marketing Engineer
Regular Contributor I

Re: External antenna gain value when provisioning

Thanks for everyone's help. I'm leaving things rounded up for now. We'll survey the building and see how things look.

 

Mike

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