Interference in the PTP 5.8 in 20 and 40 Mhz

RouterOS Wireless Networking
1

Hello,

Why always that i enable the channel width 40 Mhz in my PTP, all the others PTPs in 20 Mhz goes up and down. I want to get more link (stable) in 5.8A+N, but i can’t get it because it affects all the others. I’m using XR5, Rocket M5 and another 5.8 called javelin at the same tower with at least 5 meters distance between each one. The PTP has 27 km.
And how can I get the best troughput with mikrotik. e.g. RB* xr2 m5 bullet groove, which one is the best way.

Best regards.

2

This behavior is normal for your configuration, it’s because 40mhz it’s wider and therefore interfere with the others near especially if they are on the same tower.
Regards

3

So I must use just one dish if i want to use 40Mhz, or if I use 40 Mhz in all i will get more trouble. I want the help of you because the test is over a link that can’t stop, so what I discover here will avoid that it stops working for too long.

Thanks

4

If you want stable link you don’t need 40mhz you need less, 40Mhz will just increase throughput.
Make a scan and see what channels are left and try to isolate each other.

5

Thanks again for your answer, but, what you mean by isolate each other, is to use diferent frequences? Have you ever used some type of cover like radome shiel da azlink, you think it gonna work better. http://tec-wi.com.br/site/?page_id=1938

Regards.

6

As suggested you need to do a proper Spectrum analysis of the area and then you can decide what frequencies / bandwidth to use. Every situation is different. Less bandwidth is more stable in crowded spectrum. also consider datarates, protocol’s. There are many tweaks you can do but first you must do that analysis. A simple scan from within a router will only show you whats around using the same protocol as the scanning radio. For example there could be a canopy installation nearby, this will not show on a scan but will wipe out a good chunk of the 5ghz spectrum. Mikrotik is better in my opinion than UBNT when it comes to tweaking bad connections. you can always hire a spectrum analyser

7

Better antenna shield will help reduce side loop energy and reduce local interference, but make sure you are not over power…

8

Are you using the XR5 radio card for PTP also (Xr5 is just A and not N)? http://dl.ubnt.com/xr5_datasheet.pdf
Also if you have signals from other antenna’s with below -30 on a scan then you need to improve signal shielding,
rembember RF shielding can internal for intergated sectors or external for dish
http://forum.mikrotik.com/t/radio-card-rx-bandwidth/45267/1
Also I totally with comments by karina

P.S. My next project will be to Rf Shield grid antenna dipole section