36 Radio InstallationInstalling the microphoneImportant: The microphone grommet must be installedwhenever the microphone is plugged into the micro-phone socket. When installed, the grommet has two functions: to prevent damage to the microphone socket when thereis movement of the microphone cord, and to ensure that the control head is sealed against water,dust and other environmental hazards.1. Plug the microphone into the microphone socket on thecontrol head.2. Slide the microphone grommet along the microphonecord and push two adjacent corners of the grommet intothe microphone socket cavity.3. Squeeze the grommet and push the remaining cornersinto position.4. Check that the grommet is seated correctly in the cavity.Installing the antennaInstall the external antenna according to the supplier’sinstructions. Good quality 50 ohm coaxial cable must beused, such as RG58 or UR76.Important: The cable should be routed in a manner thatminimizes coupling into the electronic control systemsof the vehicle.Warning: RF exposure hazardTo comply with FCC RF exposure limits, this product must beinstalled using an externally mounted antenna with either a2.15dBi or 5.15dBi gain.microphonegrommetcontrol head