Hi i have a point to point connection using two 24dbi 2.4hgz grids. The nis is very high. My signal strengh is -93 when im using two 100mw r52 cards. and -76 when im using a 400mw card and a 100mw r52 card. When i do i ap scan at home then the r52 will show that the noise level of all the ap’s is -101 or -100. Some people say i should go 5ghz and others say i don’t need to. Any advice. thanx
5GHz will probably not have as much interference, and you will have less noise. You can try the new R5H which is both higher sensitivity and higher power ( 320mW) than your R52. 5GHz ir good for Point to Point links
you should do anything possible to get your signal to -60, because -90 is pretty bad. check your cables and connections, and scan for nearby APs that use similar frequencies, and try to set yours to a unique one
thanx i will se if i can get one
Hi normis i bought two 5ghz 24dbi grids and two r5h cards. The noise is still -91 tp -89. What i have heard is that the r5h has a filter that can block unwanted signals. But the noise is stil very high. With my 2.4ghz 24dbi grid i got -84 when just using a 100mw and a 400mw card. The r5h’s are both 320mw. But the noise is still to high. I also made the cable shorter for less db loss. What can i do. And is the card running 320mw by default or must i setup it to run 320mw. thanx
More output power can lead to more noise. So try to lower the tx power from RouterOS… And by the way, check your antennas, most antennas/feeders are capable of less channels than the cards, so there could be a problem there…
Thought I would throw in a few cents, not 2, but three…
I’m thinking you might be new to these wireless links?
WHen I was I tried alot of things to get a better signal, a 4 KM link on 5800 Mhz, getting 70 - 80 CCQ and signals of -80 noise floor at -90 to -95
I ended up relizing, the link is poorish, becuase of the trees and the obstructions in the way… If you were to see the link, well, thats the problem, you cant see the other side, I’m suprised it works. I am using XR5 cards and 23db antenna on one, and 19 on the other. When I tried a test link, clear across the city, with the same setup, ie XR5’s and the gain antenna’s I was getting - 70 to -72 db. I was in my car with the rb112 in my hand and holding the antenna out the sunroof, so about 2 meters off ground. The rest of the way was about 100 - 150 feet ground clearence. This was about a 15km link.
Next I try my 25 km link to my brother outside the city. we are so cheap, we will pay for the link equipment, just to avoid the $40.00 a month fee for internet.
I will admit, that using Mikrotik hardware has saved me thousands of dollars for just this purpose. Actually about $200.00cnd a month. Also another $50.00 a month for the one location that has a Media extender ( brother) who uses the link for Live TV. I also have a few more links that I have to create, and yes, it will be mikrotik. I think I should start a business.
So my original point was, maybey you have RF reflections off something.
Also be sure to upgrade to the latest ROS version when using the R5H card. There was a bug in earlier ROS versions that showed the noise floor with the R5H incorrectly.
Tom
Tom what is the link to the ros version for the r5h card? To bob both my antenna’s is th same hight and antenna and cards. The link is just 1.2km but still im getting bad signal.
in the changelog for ROS 3.18…
*) recalibrated noise floor adjustment for R5H;
So make sure you are running 3.18 or newer.
Are you sure you assembled the grid antennas correctly?
Are your antennas both installed to the same polarity?
Do you see other radios when scanning?
At 1.2km you should have a very strong signal. I am guessing -40dBm.
Tom
i used to pickup 2 other ap’s with the same signal strengh.