WL1807MOD: How to enable CH12 and 13

Part Number:WL1807MOD

Hi,

Our customer's application is using WL1807MOD WLAN(2.4Ghz),
and they are able to use the channels upto CH11 but cannot use CH12 & 13.

Please let us know how to enable CH12 and CH13.

Best Regards
Kummi