5.8Km nLOS Link

RouterOS General
1

I want to share mi experience with the forum.
We have linked a remote location with our main node in an non-los path of 5.8Km, obstruction are two trees, one at 30 meters of the end point and the other an about 600 meters.
Equipment are rb411 + xr5 + sectorial panel 90 degree 17dbi in on end and rb411 + xr5 + 29dbi grid in the other end.
channel is @20Mhz 12Mbps fixed data rate working in 5.8Ghz band.
both xr5 are at full power (about 28db)

5Mbps full duplex was reached using nstream, and 2mbps/4mbps without nstream.

Signal is between -71 and -86, with heavy rain closer than -86. In all cases snr are above 20db.

Link is stable, ccq is about 80 up to 100%.

tx and rx ccq and signal are the same.

This link was made in a first time with a nanostation5 with a grid reflector, the link was stable but with some packet loos, less bw and very low ccq on tx (from the nano view).

Hope this information are usefull for anyone.

Regards.

2

Wish we were allowed approx 30 Watts EiRP. No wonder the link works for you. :smiley:

3

keep in mind cable loss that I don’t mentioned, I think it take about 2dB, with this attenuation our eirp is arround 30W, not 50W.

4

I already took 2dB for cable loss. I said 30W not 50W. :slight_smile:

5

oh, you’re right!.

6

in New Zealand, for PTP link above 5745 we are allowed upto 200W EIRP :slight_smile:

7

I need to make a 2.6km link with tall trees in between.

The main tower has 30mts and the repeater only 12mts. 900Mhz doesn’t work due interference. Any idea to make a stable-no latency backhaul link?

8

How many tall trees? The only way is trial and error if you can’t use 900MHz. I’d try 2.4GHz with high gain antennas and see what results I get.

I’m doing a ~1.6mile nLOS link, shooting through lots and lots of trees, with two rb411s, XR9 cards, and 13dbi yagi antennas. The signal level hovers around -70 with a 5MHz wide channel.

9

I had XR9 but a link from another WISP made imposible to keep working.

Trees are 25mts high at 300mts from the main tower. The link is kind of working now, with -80 signal but very very low bandwidth with 2.4 17db 120º sector panel, r52h b-only and 24db grid and another r52h.

Im want to make this link a backhaul for a repeater. Any idea?

Thank you in advance.