hi there
we will have a 125km or 80 miles link using the microtik rb435 board and the dbii
f52n pro (atheros 9220 chip) cards, before we start with all the ACK
timing problems and packet sizes tests, can somebody provide us with a
configuration file that works for over 110km (from my reading at that
distance we will run in some troubles)..or what protokoll is best and such, we have a complete free fresnel zone 60% and morel, and we did allready a 72km (45 miles) link so aiming antennas and such stuff is not our problem.
One detail, we want to get abouth 40mb troughput, so 20 or 40 Mhz should
be necessary and we will use the 5 Ghz band,
thanks in advance.
just to inform :
we finished most of the instalation and we have now a 30dbi mimo dish on one side and a 34dbi mimo dish on the other, but the CCQ is bouncing from 60% to 90% and data trouhgput is from 90Mb to 12Mb changing , so we will replace the smaller dish for another 34dbi antenna, by the way does mikrotik RB has something similar like the UBNT gears, that is, when i change some configuration it goes into test mode and goes back to the old config after a while (this is very usefull when you have to drive 3 hours on bumpy roads and then have to climb a mountain for 2 hours if you made a little wrong klick) here a some pictures from the way up and the view up there ht tps:// plus.google-dot-com/photos/110037793424454011121/albums/5707701443538393585
I changed allready to all channels and the speed I put down to the max level I usually get when I run it to test. but the link is still very unstable it even sometimes looses the link compleatly
Right now, you have no clue what the problem may be.
Have you compared your predicted path gain to your actual path gain? If you haven't, you have no idea if this is a link budget problem.
If you path gain (link budget) is within a few dB of what you predicted, it's not a signal level problem. Knowing that you would start considering noise levels.
It is no a link budget problem we are even below because we calculated with 2 30dbi antennas and use (now) 34dbi we even had tu turn down the power to 10db manual and we got a lot more speed, one problem is we can use only nstreme nv2 won't work and I don't know why, also we just use 24mb 36mb and 54Mb speed its more stable maybe I should send my config files anybody interested to help?
Ah and I forgot the noice level is very low up on the hill we have no other then our signal and on the other points 5.8 is still not very crowded in mexico I see about 4 ssid's and the chanel we use is clear
You still have no idea what your noise floor is. Seeing four AP SSIDs doesn't' tell you very much, there may be hundreds or CPE emitters that only a spectrum analyzer would show as noise.
Using the lowest MIMO data speed of MCS 8, you should be seeing around a -54 dBm endpoint signal level. What is your actual level you are seeing?
Of course if you use faster speed, your endpoint would be round 62 dBm and with a mere 14 dB link budget margin - not the best, but useable to a point..
what i was trying to tell you with the 4 essidīs we see up there:
i have a noice floor of -116 hill side und on the other site its -100 and the signal is -66 on the hill side and -65 on the other side so you still tell me i have no margin?
yes you are right i have no clue why its too slow, i guess we just have too much distance to geht more speed, i coulndt find nowhere any info on links more then 70 miles long and speeds over 70 mb i supose we hit the limits
125km or 80 miles wifi link 
Linear Mode
