But yeah, finetuning your P2MP is the hot word here. And one new AP or frequency shift from a competitor can throw all your hours of finetuning overboard .....
Yes its a never ending battle in p2mp. You are very lucky you can get good results on 80mhz. I don't have 80mhz of clean, contiguous spectrum in any direction (I define clean as not
picking up other signals in the -80s or stronger). I very rarely get a better result on 40mhz than 20mhz! But even when I do I don't use it unless I really need the extra bandwidth, because it's more chance of fucking up (as per your original point!)
According your threshold my environment is not so much different. I have problems finding 40Mhz of 'clear' spectrum, let alone 80Mhz.
But you need to have a good knowledge of you physical environment and the location or your towers, your clients in respect to other towers and their sector antenas.
The good thing of 'ac' protocol is it has some sort of 'interference avoidance' system build in and with the combination of looking for relative high signal strengths. (I try to go for -40, -50 is acceptable, -55 just the limit and beyond that I am either looking for a bigger client antena or to find another solution....)
One of the 'nice' tools you can work with in 802.11 modus is that you can run a scan from both the client or the AP while the connection doesn't get lost.
On an AP looking for its best frequency it is not enough to look for free space '"at" the AP. You also need to know what the client's are been hammered at.
It can well be that where some canals only hit the AP with say -78 or -85 at the client the same 'alien' AP might come in with -50 or worse! So better look somewhere else or this client will see lots of problems. Do this for at least two of the clients spread over your working sector.
It's a lot of work and yeah, hence I work a lot in the middle of the night...
An AP takes several hours to do at times and I have some 40....... meaning that by the time I finished the last, I can start doing the first again.... a never ending battle...
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Rudy R. Puister
WISP operator based on MT routerboard & ROS.