Y 2 antenna connectors.

RouterOS Beginner Basics
1

OK, basic beginner’s question.

Looking at buying a AirMax 5G-20-90 sector antenna.

It apparently has 2 SMA-RP antenna connectors.

Why?

Can you connect two cards to it and run them simultaneously on different frequencies? ie for Nstream dual.

Can you connect the two connectors on the same card to the two connectors on the antenna and… well I can’t imagine.

Can you connect them to two cards and leave one card disabled, to be enabled by Watchdog if the running card stops working?

Anything really arcane?

This antenna is designed for the Ubiquity Rocket but the vendor’s blurb says “Ubiquiti Dual Polarised antennas also work perfectly with MikroTik 802.11n NV2 long range wireless radio cards as well.” Anybody like to comment on this?

2

SMA-RP question is answered by you already (Coz its designed for Rockets).

Can you connect two cards to it and run them simultaneously on different frequencies? ie for Nstream dual.

Yes only other side should have also dual polarization antenna

Can you connect the two connectors on the same card to the two connectors on the antenna and… well I can’t imagine.

Yes u can do NV2 with both chains enabled

Can you connect them to two cards and leave one card disabled, to be enabled by Watchdog if the running card stops working?

2cards 2antennas and why not?

Yes- They can be used on NV2 based BS as well.

3

So it’s really just two antennas in one box? Are there any rules about frequency separation at 5GHz or is it just as if you have two antennas next to each other?

Sounds fantastic (making mental note to find out what NV2 is.)

Thanks.

4

So just to get this right.

I can use 2 separate wireless cards in a RB433 with direct power.
Each card connected via pigtail and LMR to this sector.
Run 2 separate APs from the same sector with the same coverage.
1 group of clients vertically polarized at 5xxx freq and the other horizontally polarized at 5yyy freq.
No interference between the 2 APs on the one sector.

Is this correct or will this not work?

5

I wouldn’t recommend it.

The antennas were designed for a MIMO system, not two separate systems. You will likely have self interference issues, if not from the antenna from the two cards on the same band.