What is the quality of satellite TV receiving antenna without receiving signal?
The satellite TV signal is increased, the decline in the quality of mosaic haltingly and receiver loss of lock and even the first feeling is certainly to crash suspected television or satellite television signals have problems is to reduce the emission caused by power. In fact, the reverse is due to the fact that satellite TV uplink or satellite causes signal power to decrease. As a result, the quality of reception is very rare in practice, often due to self acceptance. There are many loop links in the received link. In many cases, the quality of the signal will be reduced. Therefore, when a problem arises, it should be considered and analyzed synthetically. It can not be simply attributed to the uplink station or satellite.
External causeSince it is not for its own reasons, it must be external reasons and many factors.1, uplink stationA, uplink equipment, such as power amplifier, modulator and so on, switch to backup device because of malfunction, but the power is not calibrated and the uplink power drops;The B and uplink stations are switched from the A station to the 8 station, the power is not calibrated, and the uplink power is decreased;C, automatic antenna tracking is not allowed, or the antenna needs to be re tracked satellite;D and TV carrier have super power usage, which is corrected by satellite company, so the uplink power is reduced.The two carriers referred to by the arrow clearly exceed the transponder power calibration limit of about 3dB, and belong to the ultra power use. The left arrow is television carrier, satellite company requires Shen's power, otherwise it will be charged according to the power bandwidth of the transponder lease expenses.The reason for this is because the transponder multi carrier work, in order to avoid cross interference, each carrier to backoff according to the corresponding proportion occupied the transponder bandwidth (single carrier using the whole transponder without fallback, so receiving large carrier whole transponder using must be smaller than the carrier signal strength). Because the initial transponder bandwidth is not enough, individual carriers have excessive power usage, but they have no effect on other carriers, and the satellite companies have not been forced to correct them. However, due to the increasing carrier number, the carrier used by the ultra power must be reduced to the required value, otherwise the new carrier will be used without power. At this time, the original desire for smaller caliber antennas, users did not choose the standard antenna, the ratings will certainly be affected.
