EM160r-gl MIMO antennas 2x2 + 2x2 possible?

[ifellow]

Esoteric question about MIMO 2x2 and 4x4 antennas


I want to build my own arrangement with diy antennas as a learning experience and I'm having trouble finding documentation that doesn't require a 600 level degree in RF theory
I am trying to set my camper (that moves constantly) up with a more reliable connection and have moved from a single band ec25 to a carrier aggregating EM160.
What I really want to do is put up a couple omni 9db antennas for one 2x2 and possibly a set of homebrew biquads as the other 2x2 set. That way no matter where I am I get reception with the omni's and if need be can direct the biquads toward the appropriate tower.
My em160 supports 2x2 and 4x4, I'm hoping it supports 2x2 + 2x2
I promise I'm not just asking here. I've been reviewing the data sheet and googling furiously (including the quectel forums)

OR should I just put up 4 9dbi antennas and be done with it?

I refuse to spend hundreds of dollars on prefabbed antennas, so please don't tell me to just A>buy and B>an overpriced antenna Thanks!

Thanks!

[Didneywhorl]

You're looking for the hardware design guide, reference RF ports. Other than that a general idea of what it does during operation.
I'll be at my office pc in about two hours. I'll link and explain what I think when I get there.

[Didneywhorl]

EM160R-GL.zip

[Didneywhorl]

The modem uses the main and div ports for all general LTE transmissions. It only uses the two mimo ports for mid and high band frequencies (MHB: 1452–2690 MHz), and only under load, AND only on towers that support 4x4 MIMO engagement. The Main and Div will support all frequencies (~600-6000 MHz)

[ifellow]

HOLY HECK THAT'S AWESOME
THANK YOU

So there is no real point in trying to use directional antennas on mimo1 and mimo2 unless I also put them on main and div and point them all at the same tower

Is there anything special about a 4x4 mimo antenna element wise? Like are they all tuned to the same or different frequencies?

Thank you so much. Even if I decide not to build an arrangement I very much appreciate having a better understanding of the equipment and setup.

I'll be reviewing all the documentation as I can; i'm still waiting on a few parts before I fire this card up.

[Didneywhorl]

Generally all 4x4 antennas use four identical elements placed in different rotated positions.

[ifellow]

rotated for phase, not direction, yeah?

so 0, 45, 90, and 135 degrees phasing?

[Didneywhorl]

More like dual 315, 45 phasing in a stack.