Is there any recommendation for equipment that should be used for link longer than 60km.
I have running three links length by 20,30 and 65 km that are connected in station mode to one AP with CM9 and 32dB parabolic dish.
Operating frequency is about 5240MHz.
During nice weather, everything works just fine with signals floating from -63 to -82 dB.
On some bad weather conditions, as heavy rain and storms, i simply see these stations connected with signal about -86 to -89 and operating rate of 6 Mb/s. Links are configured to use 24Mb/s supported and 6 Mb/s basic rate. PPPoE connection drop at that time.
Could I achieve any improvement with changing CM9 cards with for instance compex 200mW 5.x GHz cards or in worst case SR5.
Actually, I intend to build bigger dishes, but until I do that I need some solid solution.
There’s something seriously wrong with your installation if you have signal fluctuations as big as 20dB in good weather.
Before throwing more power and gain at the problem, go back to basics and make sure all your existing cabling is in good condition and properly weatherproofed.
It could be as simple as a centre pin not crimped properly in a connector. This could lead to poor connections due to corrosion and vibration.
It is very possible to expect any unexpectable reason considering this is on high mountain with strong storms.
I supposed that is could be vibrations of parabolic antenna considering its shape.
Anyway I intend to check any part of equipment there again to see if there is any sign of water in connectors. I used rubber and plastic isolation, but there is always posibillity that something is gone wrong.