High Signal to noise, please help!

RouterOS Wireless Networking
1

I have ptmp link. On AP side i have RB433AH with SR5 card and dish parabola 26db antenna. On client sides i have RB433AH with CM9 cards and dish parabola 32db. One link distance is 15km and 18km. When i look at AP signal strength is -60db and tx signal strenght is -80db. Noise is 50db. When i look at client sides signal strength is -80db and tx signal strength is -60db and noise is 20db. Why on AP side is so much noise? I will add screenshots to see it better.

I will change on AP side antenna to 32db, i think i will get better signal, yes?

Thanks!

2

First image is ap with 2 clients. Second is client that is 15km from ap. And third is client that is 18km from ap.
ap.jpg
client1.jpg
client2.jpg

3

looks like you have some interference on the AP side. you might try a scan and see what is on your channel and see if there is a cleaner one.

4

This is freq usage on ap side but i am in superchannel and my freq is 5070. This is best freq with max bandwidth.
freq.jpg

5

is both of you client within the parabolic antenna coverage?
usually the parabolic antenna is 3~5 degree for 29~32dbi.

the other thing is, check you antenna covered frequency, it will given worse result if you are not within the covered range.

6

I have checked it. I wouldn’t place parabolic antenna in other case. Difference in angle is 0.5 degrees because distance is 15km. Two clients are on same line. They just have height difference about 100m.

7

Covered frequency is 5150-5850 but in that range is get even worse result. This lower frequencies are best… i don’t know how.

8

can you perform the wlan snooper and scan and post it up…
when you use super channel make sure on client side you scan list is 5000-5900 ok…

9

Yes, i know that. I won’t even connect to network if i don’t put scan list. Here is snooper. Highlight is my network. As you see it has lot of free channels around my freq.
snooper-network.jpg
snooper-station.jpg

10

can you send me the link of you antenna, then we can figure it what happened already.

11

here are my links. Lowest height(top of hill in middle) is 43.81m on lower link.
higher-link.jpg
lower-link.jpg

12

Radio cards ??? As you are using 433AH on both AP + Client side, then I would use R5SHPn radio cards

13

I think that one of your CM9 cards is “going down” or if they’re not alone, they interfear with some other links there.
Try to replace it and check again.

ALSO, we need HIGHER S/N.
For exapmle: 50dB is good but 20dB is BAD.

“And third is client that is 18km from ap.” >> This seems that it gets interfearence from something else OR that the CM9 is “down” - get another one and check again.