i want to know what the meaneing of noise floor and what is the best for example -100 dbm or -20 dbm (noise floor)
Noise floor is the measure of the signal created from the sum of all the noise sources and unwanted signals within a measurement system.
The lower the noise floor, the better the quality of communication. Noise floor being a negative value means that -100dBm is lower than -20dBm for instance.
To answer your question, -100dBm is far better than -20dBm. If you have a noise floor of -20dBm, I believe the channel will be completely useless for any for of communication.
so i have another question i have 4 sector 90 degree Horizontally 16.5 db (interactive) i put on each sector amp 3 watt (hyperlink agc) after i put the amp for each sector i faced a problem the signal is very good to the client but if i make ping between the RB230 (my AP bridge) and the client the time is very high or theres request time my noise floor for each RB230 -20db and -30 db just one RB230 -100 db and the only one working good so is it to high power that i put it for each sector or there is something else ??
Get rid of all the amps, they won’t serve any useful purpose. Amps will amplify both signal and noise in the same order of magnitude, so, the signal to noise ratio remains the same with or without the amplifiers.
Always use good quality, high gain, high sensitivity antenna.
ot seem like you have misunderstand something…
if u add the amplifier at the AP site and the client site remain normal wireless card, this will become..
example:
in the distance 500meter, you (AP) talking to you friend (Client), you are using HiFi to amplified you voice, you friend can hear what you say clearly, but when you friend talk to you just like normal, you are not able to hear what he talk clearly due to the distance.
and one more thing, due to you are using the Amplifier to Amplified you voice, you can consider who are the whon make noise at that area too…
Hope you got what i mean.
This does not sound like a good setup at all.
As the other guy said… Throw the amps away..
It is likely that some RF is getting into the other amps.
How are your sectors postioned, are you using 5.8 or 2.4… (my guess is 5.8, I hope)
But you are well exceding the max erps that I know about. What country is that?
If you are using same channel, and if you have to use an amp, why dont you use a 4 port splitter and equal length feeders.
But you will have to observe the manufacturers spec very closely regarding spacing of antenna.
If you are using 4 seperate channels, what are your frequencies that you have chosen.. DO they overlap in terms of bandwidth. You need good channel seperation and must observe correct antenna spacings else their polar patterns overlap and affect the gain.
Are the radio cards in the same enclosure?.. Do the pigtails come close to one another within enclosure.
Regards
Simon