mám to doma chvilku, nezabýval jsem se tím, stačí mi vlastně jen pokrytí pokoje.
ale v nastavení vidím položku Radio Power, to by mohlo být ono.

pro info, menu má tyto možnosti:
Home
Quick Setup
Wireless
- Interface
- Bridge
- Access Control
- RADIUS Setting
- Advanced
IP Config
- WAN & LAN
- DHCP Server
- Route
- Miscellaneous
NAT Setting
- Port Trigger
- Virtual Server
- Virtual DMZ
Internet Firewall
- Basic Config
- WAN & LAN Filter
- URL Filter
- MAC Filter
System Setup
- Change Password
- Firmware Upgrade
- Setting Management
- Factory Default
Status & Log
- Status
- Wireless
- DHCP Leases
- Port Forwarding
- Routing Table
- System Log
Logout