Wireless channel width

HI All,

Just hoping I could get some advice on an issue I have. We currently have a Cisco 5508 WLC hosting a number of APs for out sites (running 8.3.x). At one of our sites, we are experiencing wireless voices issues due to Radar interfering with the APs, as DCA where putting the APs onto DFS channels (802.11h is enabled but does not seem to be doing much). The APs at site are 2802 AP, with 160MHz channel width enabled (WLC is set to "best" channel width").

Anyway we have manually set these AP to avoid DFS channels, which has caused the APs to use channel 36 to 48 (due to the WLC choosing the "best" channel width). This has helped but we still having issues.

At this site, there is a large number of AP due to the amount of clients. I now think the issue is because all the APs are on the same channel. What would your recommendation on channel width be – 20,40,80? At this moment in time as theres only a limited number of channels we can use outside of DFS, we will have to go 20MHz to allow DCA to calculate correctly. We do have clients on the 5GHz range which would benefit from high throughput, but the priority will be stability.

Thanks