At present, the receiver 105.5 ° E AsiaSat 3S satellite programs or 134 ° E on the 6th Asia-Pacific C-band satellite programs more and more small sets of points received. Today, a number of sets of station antenna 1.2m sales price has been less than two hundred yuan. The author in the alignment of these antennas, found some cheap set of points there are some problems.
First, the size of the feed tray
Feed tray is to support high-frequency head (LNB) and collect the signals used. Previous set of stations used in the feed tray for the two rings, with integrated tuner actually a ring round the mouth. Efficient compared with tricyclic feed tray. Today, many of the sets of stations feed tray only one ring, and some even plastic. As a result, the capacity will decrease antenna reception signals. Therefore, the purchase should try not to buy a single ring feed tray. The author specifically been tested, a 1.35m antenna set station receives AsiaSat 3S program, when using the feed tray instead of the original single bicyclic ring feed-hours, a slight pause TVB8 Channel original picture becomes apparent fluent.
Second, the feed tray strut lengths are inaccurate
Any deep into the large feed LNB dish antenna received signal was strong reasons fall into this category. Because of this feed tray only played a supporting role in the tuner, the tuner must round mouth and feed disk flush. I have installed several sets of station antennas are charged even amputated 6 ~ 10CM long, only to make parabolic antenna tuner is in the best aggregate surface location. Here is a simple method of detecting the focus: As the pot mostly white or silver paint, so the sun has some reflection. In the feed tray tile a slightly larger daytime paper, adjust the antenna so that the shadow falls on the feed tray face the center of the pot, that is, the antenna pointing to the sun. Then observe whether convergence on white paper with a lighter spot. Spot size reflects the aggregate performance parabolic antenna. You can also check whether the antenna pole and the best match. Usually in the face of the paper feed tray should be such as high-frequency head round the mouth size of the spot. Otherwise, the location of the mobile white paper to find the best focus group, and then adjusted accordingly three strut length.
There still exist many strut problem of insufficient hardness. Although the use of imitation stainless steel tube strut, but the wall is too thin, resulting prone LNB offset point. For example, I installed a receiver in the program sets AsiaSat 3S station and found the pot and not far from the surface point to the same set of neighbor receives the star of the pot surface, the direction is significantly different. To a neighbor only to find, that set the antenna tuner is not aligned the pot in the center, similar to the majority of Shaoyou pot of multi-satellite reception partial coke principle, so make sure LNB is always the center of the pot Otherwise, the signal causes the receiver antenna efficiency.
Third, small antenna aperture
Although the 1.2m diameter antennas are capable of receiving the vast majority of provincial radio program. But I still recommend the purchase of a little larger diameter antennas to ensure a more stable and reliable watch. Moreover, the actual diameter of these antennas tend to be less than the nominal size. If using the 1.2m antenna set station receives AsiaSat 3S satellite programs, there may not be stable and CETV watch TVB8 sets of programs such situations. |
