Nokia Mediamaster 9820 T Owner's Manual

GB 9• Certain outdoor antennas are pointed at an analogue slavetransmitter. The roof antenna should be pointed at a digital TVtransmitter.• It is not always advisable to position the antenna as high aspossible. If problems arise, experiment with different antennaheights. The same applies to analogue transmissions.2. Indoor or window-mounted antennaThis type of antenna may be enough if the reception conditionsare very good. If an indoor antenna is used, please note the fol-lowing:• Use an antenna for UHF channels 21 - 69, such as a directionalantenna.• The directional antenna should have horizontal polarisation(preferably rotatable).• Place the antenna by the window and point it towards the TVtransmitter, if possible.• An antenna with an amplifier is recommended as it may pro-vide a stronger signal.• Attenuation of the TV signal varies according to the buildingmaterial. The signal penetrates thick stone or concrete wallspoorly. A window improves reception. However, a woodenbuilding is no barrier to digital TV signals.About antennasRadio and TV signals can be blocked by buildings, mountains andthe terrain. If the receiver is located in a depression in the ground,behind a mountain or in a concrete building, the quality of recep-tion may vary considerably.Because the TV signal is amplified by reflections, reception isoften better than with analogue reception and “ghost” imagescan be avoided. Reflection can even be used for reception bypointing the antenna at a mountain or a high building, providingthat they do not block the transmitter.As with analogue TV, weather can affect reception. This is thecase particularly at the edge of the reception area for digital trans-missions.