09-13-2019 07:14 AM - edited 07-05-2021 11:00 AM
Hi all,
I'm not sure about the settings of the"Antenna Configuration" for an 1852E Mobility Express Access Point.
If I look at the datasheet for the 1852E, it notes that 2.4GHz uses 3 antennas. -> Does that mean that for Radio 1 only 3 Antennas need to be ticked (which 3)?
The antennas I use are AIR-ANT2524DW-R-RF 2.4GHz2 dBi/5 GHz4 dBi DipoleAnt.White,RP-TNC
so, is it correct that I have to change the Antenna Gain for 2.4GHz to 4 x 0.5 dBi?
Thanks a lot
Willem
10-04-2019 04:47 AM - edited 10-04-2019 04:52 AM
>>> Does that mean that for Radio 1 only 3 Antennas need to be ticked <<<
-> NO. the 4th is also used, it means only max. 3 antenna's are used to transmit, this could vary according to client position.
if 4 antenna's are mounted -> all boxes ticked
the current shown antenna gain settings are correct
2,4GHz: 2dBi -> 4x0.5dBi
5GHz: 4dBi -> 8x0.5dBi
07-15-2020 07:59 AM
I have 2 x 1562E AP's. One is the RootAP and the other is MeshAP mode to create a bridge. Each uses a single AIR-ANT5114P2M-N external antenna which have 14 dbi gain. Using your info below.
2.4GHz: 2dBi -> 4x0.5dBi
5GHz: 4dBi -> 8x0.5dBi
My setting should be
5 Ghz: 14dBi -> 28 x 0.5 dBi ?
and according to Cisco's documentation. the antenna is actually 13 dBi gain with cabling.
Would I be right on this?
07-15-2020 11:19 PM
No not really,
when I wrote 2,4GHz: 2dBi -> 4x0.5dBi
this meant using 4 internal radio's each at power level 0.5dBi
28 X 0,5 dBi would describe 28 radio-transmitters in above calculation
but i believe the AIR-ANT5114P2M-N only has a single coax-connector?
so you can only attach and use a single radio from the AP and disable the others!
furthermore dB's are not multiplied but added/substracted
-> the 14dBi of the antenna should be ADDED to the dBi's of the radio.to calculate ERP.
or other way around: ERP - Antenna-gain = radio-power
07-16-2020 03:21 AM
Hi Pieterh,
Okay so that's asking for the radio count. its calculating the Antenna Gain = (# radios) x 0.5 dBi
Sorry for my ignorance. This is quite a confusing parameter in the WLC as I have looked all over documentation and states very little about how to calculate and that its the radio count. I am only using this as a bridge. they are not taking clients. The AIR-ANT5114P2M-N has two antennas with 2 connector pig tails. Right now, I'm only using the 802.11a side for the backhaul on the bridge.
What should I be using for the radio count? 2?
07-16-2020 05:42 AM
The radio count available depends on the electronics circuit in the access point. you do not need to calculate the number?
the 1850 series has a total of 4 connectors each internally connected to a dual-band radio
so 4x 2.4GHz radio's and 4x 5GHz radio's present
as you mention the AIR-ANT5114P2M-N has internally two antennas with total 2 connectors you can only connect two of those radio's to the antenna.the other two connectors on the AP are unused.
also as the antenna is only 5GHz (not dual-band ) you need to disable 2.4GHz
I also advise to disable the unused 5GHz radios in the AP configuration.
never done this on a 1852, but I guess you do this by disabling diversity and then select the active antenna's
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