Of course, diplexers have their own insertion losses, so they'll decrease the signal quality. This way, at the output of diplexer you'll only have the best signals from all antennas you have and weak signal from one antenna won't interfere with a strong signal from another antenna. It's a device that has a band pass filter (some implementations may just use low pass and high pass filters) and you set it up so that it passes through the frequencies which a particular antenna is receiving the best and blocks other signals. Usual solution to that is to use a diplexer. If you have another antenna matched to the weak signal source of the first antenna and you combine them both directly, first antenna's weak signals can interfere with second antenna's strong signals. That antenna will still pick up signals from other sources as well, but they will be weaker. It is designed for its frequency, has sufficient gain and is correctly pointed at the signal source. Let's say you have an antenna correctly set up for one signal source. You can use multiple antennas for best signal quality, but there are some bad sides to that as well. So in general, you should point the antennas correctly for best signal quality and use proper polarization as well. To them, it's the same! This means that most of analog transmission experience applies to digital TV as well. The electromagnetic wave and antenna don't know if the TV is analog or digital.
0 Comments
Leave a Reply. |