Clipsal StarServe - Installation Guide, 11635

SECTION 2Introduction to MATV BasicsSignal QualityThere are two parts to a perfect TV picture, signal strength and signal quality. You can have excellent signal strengthbut if your signal quality is poor then this will result in poor quality pictures.Many of the problems faced with signal quality have been overcome with the introduction of digital TV. For examplewith digital TV you will not get ghosting. Clear line of sight is obviously the best possible scenario for high quality TVreception but often cannot be achieved.We need to avoid the following when installing antennas:• DO NOT install antennas in the ceiling space• DO NOT install antennas with trees in the way of line of sight• DO NOT install antennas within one metre of the roof.Before you install an antenna:• DO a site survey; this is a walk on the roof withan antenna and digital fi eld strength metre. Thiswill give you an indication of the best possiblelocation to install the antenna on the roof.• DO check each TV station on the site survey. Thisconfirms that it is the best possible location for allTV stations reception.Bit error rateBER – Bit error rate measures the number oferrors on the incoming signal. Too many errorswill result in pixilation, boxing or freezing of thepicture. There is a four star rating associated withdigital signal reception:No picturePixelated pictureFAIL FAIL PASS PASSVERY POOR QUALITY POOR QUALITY GOOD QUALITY EXCELLENT QUALITYIt is the installer’s responsibility to follow the appropriateOccupational Health and Safety (OH&S) work practices.8 INSTALLATION GUIDE