Challenge: 10-30km link with 5Ghz triple chain radios

RouterOS Wireless Networking
1

Hi,

I’m going to make a link over 13km’s which needs to have a 100Mb througput under all circumstances.

Now, although the LOS is good and fresnell is nowhere touched, the first 40 meters of one side is running low over a flat roof top.

More worrying is the fact that almost every available 5Ghz frequency is already in use one way or another from distant AP’s… (5, 10, 20 or 20/40Mhz channels. 75% Airmax, 25% MT (Nv2))

So, what I wanted to do is setup a triple chain link. Bought some compex WLE350NX cards and this week the antennas will be connected.
I use on each end one 30dBi Duo chain dish for the 1st 2 chains, and then the idea it to set on each end one more 30dBi mesh antenna with 45º angle. This latter will have to be connected either just above, or beside, the mentioned dish.

3 reasons for ‘playing’ with triple chain:

  • Learning. Building a triple chain experiance…
  • Higher possible throughput, or better change to get desired throughputs
  • Hoping to get better resistance against possible interferences for other 5Ghz signals that could degrade link.


    Anybody already has any experiances with this kind of setup?
    Anybody might have any foresight in possible issues or disadvantages?

I think this can become an interesting topic so please join in and share your opinions/experiances… :smiley:

2

I tried almost identical setup and gave up. 12km 3x3 jirous24 plus mesh and one site over flat roof for 30metres. I’d rather try ospf to simulate full duplex to achieve 100mbps throughput. I’ve got solution in production Mimo 3x3 downlink and 2x2 for uplink but in short distance 200meters and I see that 3x3 doesn’t work well on long range links. good shielding 2x2 should give decent
isolation. set mcs12 16-QAM wchich is very stable in noisy environment :wink: and it will give stable link 100/100 mbps :slight_smile:
nevertheless if You gain succes in your challenge let me know, good luck!
I’m waiting for 802.11ac, done some tests with 3x3 160mhz got 600mbps tcp :wink: