Two antennas, not dual-pol...?

RouterOS Wireless Networking
1

If I attach a BaseBox to a non-MikroTik dual-pol antenna, I get a dual-pol signal.

If I attach two of the ACOMNIRPSMA antennas instead, I’m assuming I don’t get a dual-pol signal, because my understanding is that the polarity of the signal depends on the construction of the antenna, and all ACOMNIRPSMA antennas are built identically.

So what advantage do I get from the second antenna (other than not blowing out the radio chain due to having no antenna installed))? If I have this setup on an AP, is an SXT client going to see any significant improvement in signal over me just turning off the second chain?

2

Polarisation is about antenna orientation.

3

Thanks, but I don’t see how that statement actually addresses any of the questions I posed.

4

I was correcting your assumption. You will get the answer from it: you can use the same antennas to get different polarisation if you orient them accordingly.

5

ACOMNIRPSMA antennas don’t allow for orientation changes as manufactured. The BaseBox marketing literature always shows two parallel antennas. So the original question remains: what advantage is there to running dual antennas in this way, that the product would be designed like that?

Secondly, it would seem to me that using a third party elbow adapter to orient the second antenna parallel to the ground would result in strong signal towards two opposite points of the compass, very weak signal towards the intervening two points, and much power wasted towards the ground and sky. True horizontally polarized omnis would have a much more “omnidirectional” pattern.

6

I think that the intention of having 2 polarities is to have a better isolation in both chains when you use integrated antenna, in other words, when you use 2 chains in the same antenna arrange.

I have used 2 Ver Pol sector antennas connected to a r52Hn with the proper separation and worked just fine in both chains, i cannot say it worked better of worse, but did the job..

Regards

7

Well, yes but keep in mind that if you use a higher gain antenna the vertical lobe will be reduced and if you turn the antenna on it side might not work properly.
For example this antenna http://www.superpass.com/SPDG13O.html
You have the H Lobe has 360 degrees but the vertical may have only 30degree so if you turn it to a side, you won’t get an omni directional antenna anymore..
Maybe you can do an arrange with one Vertical pol Omni and another with Horizontal Pol Omni. on each chain.
Like this,1 Horizontaland 1 Vertical pol 5.5dBi Omni Directional Outdoor Antenna.
Regards.

8

Thank you for pointers to the SuperPass product line, with which I was not previously familiar. In that price range, I usually just go with the dual-pol Arc Omni, which is easy to swap it in to an existing BaseBox AP to improve the signal. But as it costs me under $20 to try the dual ACOMNIRPSMA for starters, I was just wondering what if any benefit the second antenna was supposed to give me. Technically, I’m running two chains, but am I really only “running the same chain twice?”