![]() ![]() ![]() ![]() A low-frequency signal propagates more than the high-frequency signal for the same amount of transmitted power.As satellite transmitter limits the overall power transmitted through it thus downlink frequency signals should possess less attenuation than uplink frequencies.The two major requirements of downlink frequencies are as follows: And we have already discussed that the downlink frequencies must necessarily be less than the uplink frequencies. Also, during the downlink operation, the output power shows dependency on the downlink signal frequencies. This ultimately limits the power at the satellite, thus, in downlink operation, a small amount of power is transmitted from the satellite towards the earth-based station. Due to this, the overall size of the antenna and amplifier get limited. Requirements for Downlink Design: In the downlink configuration, the transmitting antenna for sending the downlink signal and amplifier is present at the satellite itself. However, exist some necessary requirements that must be fulfilled. Here low pass filters can be used that can block the high-frequency component of the uplink signal and can pass the low-frequency component constituting the downlink signal.ĭesigning a downlink is not much difficult. Another important point regarding the separation of uplink and downlink frequency signal at the satellite is to use filters. This is due to the fact that if the two will be the same then the close presence of uplink and downlink antenna will lead to jamming of signals. It is to be noted here that uplink and downlink frequencies must be different. The frequency of the signal during uplink and downlink is known as uplink frequency and downlink frequency respectively. However, when the satellite transmits the achieved uplink signal back towards the ground then it is known as a downlink. In our previous content on satellite uplink, we have discussed how the signal from the earth station is transmitted to the satellite. It operates in a way that signal from an earth station is transmitted towards the satellite and further the satellite retransmits the signal towards another earth station. It is known to us that satellite communication enables us to send data from one end to another by using a satellite in space. ![]()
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