Could you give us more information as to why you need that much output power from the E400?
In my view, there is not much point doing it, since most devices connected to the AP will not be able to transmit with more than 14 (cellphones) and 18(laptops) dbm of power, and WiFi must be capable of Bi-directional communication to work.
Even if you disregard all the "regulatory" part of why not to do it, high TX power would not extend the coverage range of the AP, because that is not really defined by how far the AP can transmit to, but rather by how far can the clients respond from.
There is also the part where the TX power must go down for the higher modulation rates to work(802.11AC), so the most likely outcome of a 30dbm setting is reduced troughput capacity.
you can make use below 2 cli to see max power on each country channels on Cambium Wi-Fi APs
show wireless radios channels <2 character county code>
show country-codes ---- To get country code values
High TX power increases the range and clients also need to transmit at high power if they are far away from AP. When we need to establish mesh link between 2 APs, which are far from each other, we can make use of higher TX power configuration on APs
at my place i try tx power 23 dbm , the device get the signal is good but latency always 1000 ms sometimes rto , but the sigjnal get 4 bar when rto if the concurrent 23 client.now i'm using contry code other , it get just 28 dbm for power from AP,channel width using 20 Mhz and channel 13 ,i'm using cnpilot tools to scan clear channel , it show that 13 is good for us using. but some devide still can not get good signal if not using 30dbm,
will all users advice me which the better one to make it power 30dbm for AP cnpilot, cause i have 3 AP in one building
there are different power, 1st floor 28dbm, 2d floor 25 dbm , 3floor 28 dbm in 2,4ghz band