I've been there tooi already tried to beat my head against the wall, but it didn't solve the problem
Totally agree, once you have calculated height to clear freznel zone then look around and use a disadvantage to your advantage by placing say on the side of a building facing your clients rather than on top which would pick up unwanted signals also............................................................
Many people will disagree with this next statement, but spend some time thinking about it. Broadcasting from tall towers and from the top of tall buildings is the worst way to build a network. An experienced network engineer will only used the high space for BHs. Use the landscape to your advantage. When you can drop down below the tree line everybody else's signal is attenuated. That's how you deliver good service for a long period of time. Make your hopes small, always use as much directivity as possible, and use the landscape to your advantage.
This is problem in noisy enviroment!I'm using two free frequencies for two sectors, on a RB433 with two wireless card.
+1This is problem in noisy enviroment!I'm using two free frequencies for two sectors, on a RB433 with two wireless card.
Better is using --> One antenna with one routerboard
Changing the antenna polarity in crowded locations has helped me in the past.
What about using MIMO antennas?...
Change polarity is another good method to use
If your interference is on say vertical polarity then there is no point using Vertical?Thank you all guys, great feedback about your experiences!
Changing the antenna polarity in crowded locations has helped me in the past.What about using MIMO antennas?...
Change polarity is another good method to use
Some don't use V+h but slant polarity but first establish which polarity gives you the least amount of interference and plan from there.MIMO use both vertical and horizontal, is it a problem?
Then the the first step in reducing interference caused by two radio cards attached to a 433 is to as others will advise is use 1 routerboard + 1 radiocard to a sector antennaYes, they are attached to 433, i meant "two of my sectors on an AP"
A very good question often asked, lets use 433 as a example, it could use three radio cards 900/2.4/5.8 but not 2.4/2.4/2.4 or 5.8/5.8/5.8.....The problem is this place is very uncomfortable and I would like to reduce the number of RB to the minimum.
Do you know any trick to shield them better?
Is using 1RB => 1 Radio the only real solution?
Why is MikroTik selling routerboards with 2, 3, 4, 5 radio cards if using these slots is an issue?
No - It's just good installation practice for performance to use 1 RB=1 radio - for all locations and regardless of clean air space or not - many other users will advise the same, now using integrated AP or not it's you choice but you will have more transmitted power when using integrated and not using the 1M RF loss loss LMR ,etc. cable, quoted cable loss and actual measured on site insertion loss when using RF connection lead can be in dB's and not say 0.15dB as in the data sheet,I have a shielded container for RB and i put it 1m away from the sectors, attached to it with two shielded coaxial cables.
So, you suggest:
1 RB => 1 Radio -> When there are competitors and there isn't clean air space
1RB => More radios => When I'm alone and there is clean air space
Exactly where is the noise located? I mean, the problem is the radio card, the pigtail, the sector...?
I have a preference for MIMO AP'sThank you for your reply, I'm learning a lot
What product do you suggest for integrate AP?
Multiple cards using the same frequency band in the one board is a bad idea.With multiple cards in one board keep your tx power at 20 or below. Helps tremendously.
Interesting about the XR5's have you tried with one XR5 if using say 5520 to set frequency scan to 5500-5540No argument, but once the cards are there, you can swap the AP to get it working or you can drop the TX power.
I have 3 R52H in a 433 since I started in 2008. The self interference issue has been better or worse depending on the version of RouterOS, but since I had several pieces of hardware in the air with multiple cards in single boards I learned what to do to make them work.
Essentially, if you scan from one card and see the other in the same band with a signal greater than -40dB you will have issues. For 2GHz and 5GHz, setting the tx power below 20dBm gets the signal level close to -40 depending on the cards, pigtails, etc.
I've found that low power cards have much less self interference issues than high power cards. R52 work fairly well in the same board, R52H do not. I haven't tried this with newer cards without diversity chips. The lack of a diversity chip should help shield the signal a bit more inside the case.
I've also learned that running multiple XR5 in a single board has much less of a problem than the R52H. I'm not sure if it is due to the pigtail/coax (MMCX vs UFL) or the lack of a diversity chip. Either way, at default tx power, two XR5 in a single case see each other around -40dB in the 5GHz band. Two R52H see each other at -20dB, I've even seen signal in the teens before.
That depends what is real reason of your low throughput. You didn't share much info.Hi everybody
I have a ptp link in very noisy environment . Tx rx are -49/-50 but throughput is 1Mbit .
Is there any solution ? ( I know I should change frequency . Not this solution )