LLigetfa join:20060515 Fort Frances, ON kudos:1  reply to lutful
Re: How can i use single Freq. in 4 Canopy AP's in one tower? said by lutful:He really wants to run 4 sectors on each tower and he wants to use all 3 frequencies available to him. Not quite. Yes, he wants to run four sectors but he wants to run all four sectors on the same frequency. He wants each tower to have its own frequency.
As for the distances between the towers, they are not a factor under his current config since each tower has a unique frequency. It only becomes relevant if he decides to use the same frequency on more than one tower. Then the placement must take into consideration all factors.
There are so many permutations possible that it is senseless for me to post sketches based on conjecture. Maybe the towers are all on the periphery and no SMs would see two or more towers? J/K  Strange as it seems, no amount of learning can cure stupidity, and formal education positively fortifies it.  Stephen Vizinczey 

lutful... of ideasPremium join:20050616 Ottawa, ON kudos:1  said by LLigetfa:he wants to run four sectors but he wants to run all four sectors on the same frequency. Yes, he wanted to do that but obviously that won't work very well even with GPS sync and excellent fronttoback ratio sector antennas.
There would be interference contribution from 3 SMs (belonging to the other 3 APs) in every time slot. When some or all of those SMs are located at shorter distance from the tower than the target SM, noise may rise above expected RSSI.
People already suggested using a single omni antenna or 2x 180 degree sectors or a 1:4 splitter at each tower to meet his original desire to run one frequency per tower.
Using all three available frequencies at each tower to maximize his total wireless network capacity is just another option. 

LLigetfa join:20060515 Fort Frances, ON kudos:1  said by lutful:Using all three available frequencies at each tower to maximize his total wireless network capacity is just another option. Yes but using only two frequencies per tower might also be an option and may in fact make channel reuse easier.
Until such time that the OP gives us more details, it is mostly conjecture.  Strange as it seems, no amount of learning can cure stupidity, and formal education positively fortifies it.  Stephen Vizinczey 
