How to set UHF antenna for digital broadcasting reception
The ground wave digital broadcasting is broadcast by UHF. UHF aerial is used for the reception. Therefore, receiving it only with VHF aerial needs the installation construction of UHF aerial without fail.
Digital broadcasting and the receiving antenna
The ground analog broadcasting of the television had been broadcast up to now by the use of VHF (ultrashort waves 30-300MHz) and UHF (ultra high frequency 300-3000MHz). Only UHF will use (470-770MHz,13-62CH) for Television Broadcasting to use VHF for other usages among these. (Finally, the ground wave digital broadcasting broadcasting uses 470-710MHz and 13-52CH. )
Then, because the number of electric waves was not worth, the form of the electric wave was changed into the digital method to which a lot of information was able to be sent according to the analog form. And, the analog broadcasting of all the televisions will change into digital broadcasting in July, 2011.
To receive the ground wave digital broadcasting when a present antenna is only VHF It is necessary to put up UHF aerial. When the position of the digital broadcasting bureau changes with both VHF and UHF antennas now, the change in the direction might become necessary.
Kind of antenna for ground wave digital broadcasting reception
In the antenna for the ground digital marketed now, it seem to be ..how many kinds it... In a word, there are an antenna for a strong electric field for the ground wave digital broadcasting and an antenna for the weak electric current field.
As for the antenna for a strong electric field for the ground wave digital broadcasting, it is made to use it in the region where electric field strength is strong, and the performance as the antenna is not so good in the simple one. It is an antenna done to keep small.
On the other hand, Yagi Antenna of all band UHF used also for a past analog broadcasting can use also for the ground wave digital broadcasting, and the performance has improved. Take care is that UHF Yagi Antenna for a past analogue has the distinction for the high band for the low band. According to circumstances, it is not likely to be able to use it though it is possible to use as it is according to broadcasting the region.
Generally, an antenna that finishes being recommended is UHF all band Yagi Antenna of 14-20 elements (for 13-62CH). Of course, the antenna of about ten elements doesn't have the problem in the strong electric field region either. However, one with a good gain also in a strong electric field is and there is an advantage ..booster.. omissible, too, even if there is a distribution loss.
Difference between digital wave and analog wave
If the difference between a digital electric wave and an analog electric wave is not known, the electric wave of the television might not be able to be received well. In a past, analog electric wave, the image doubly reflects and pictures is distorted due to little trouble. Moreover, there is so not reflecting at all even if the way is a little bad.
As for the electric wave of digital broadcasting, the image doubly doesn't reflect and fall into disorder compared with it even if a little trouble is found. However, it doesn't reflect suddenly at all when the person is grinning bad to some degree. It is necessary to work while understanding the character around here.
Place where antenna for the ground digital is put up
As for the place that stretches an antenna, foresee of opening of the direction of the transmitting station of the television in general a good, high place is good. The higher, the not better if there is some height as a character of UHF electric wave. According to circumstances, it might be low.
The direction of antenna for the ground digital
I think that I only have to turn the direction of the antenna in the direction of the transmitting station in the broadcasting station generally. However, there is the electric wave's the building's there in the direction of the transmitting station neither or having weakened very much because you might not receive the reflected wave.
Connection of antenna for the ground wave digital
The coaxial cable must use the one that the loss is few and fat as much as possible in case of the analogue though it is the same. Moreover, please use the good one of the shield. (Generally, 5C-FB whose characteristic impedance is 75 ohms etc. are used.)
It surely connects it with the connection of the cable by using F type connector. Do not connect the cable mutually twisting it.
Material and how to put up antenna for the ground wave digital
The roof horse is generally used to stretch an antenna, and UHF aerial is installed on mast. The coaxial cable is connected with the antenna. Stay line is put on three directions so that the antenna should not fall in a stainless line with stay line installation metal fittings.
I think that you should surely put it on three directions though there is a person who puts stay line on four directions, too. The antenna falls if one stay line line cuts even by four directions. It is possible to set it up even by oneself if it devises it.
When the antenna stands, the coaxial cable is connected with the BS mixer, the booster, and the distributor. After it often investigates, it constructs it because the BS mixer, the booster, and the distributor might be in the room in the back etc. of the ceiling.
How to use of the booster.
It is likely not to reflect if the electric wave is not made strong with a booster when the electric wave of the ground wave digital broadcasting is weak, and there are a lot of numbers of televisions and distribution is a lot necessary.
There are a proper input and a proper output in the booster. If this is not defended, it is not possible to receive it well. It is not the one that it only has to apply the booster. You might not be than put up the booster when it is extreme. A digital-ready electric field strength meter is necessary for the adjustment of the booster.
The booster might be used directly also in the strong electric field region for the wave obstruction prevention though it is not so recently. The wave obstruction is for high-intensity radio waves to mix directly with directly on the way of the cable and the vicinity of the television of the antenna terminal and to come to have poor TV reception in the strong electric field region when there are a lot of distribution losses and a transmission losses of the cable.
It is likely to become necessary the attenuator for inputting the booster in the usage of such a booster though the booster is used for the purpose to make the electric wave strong beforehand to prevent the wave obstruction directly.
Trouble by the wave obstruction might happen directly, and give the ground wave digital broadcasting to the connection of the cable, please with scrupulous care when the connection of the cable is bad.