1. The C band is the most frequently used. Low Noise Amplifier (LNA) amplifies the weak received signal. This block determines the type of transponder. Because the Satellite has Limited RF Power Output . 5925 MHz to 6425 MHz is uplink band where as 3700 to 4200 MHz is downlink band. The direction from VSATs to sallite is known as uplink and the direction from satellite to VSATs is known as downlink. Carrier Processor performs the frequency down conversion of received signal (uplink). Why uplink frequency is always higher than downlink frequency ? To avoid Interference between Uplink and Downlink. The uplink frequency is the frequency which is used for transmission of signals from earth station transmitter to the satellite. Communication satellites bring the world to you anywhere and any time….. AJAL.A.J 1 2. 6GHz band frequency is used for uplink and 4GHz frequency band is used for downlink in C band satellite communication operation. It receives uplink signal from the satellite antenna and transmits downlink signal to the satellite antenna. UNIVERSAL ENGINEERING COLLEGE, THRISSUR- 680123 Department of ECE EC09 L05: Satellite Communication Module 3 Satellite Link Design 02/11/14 2 3. Up link frequency is the frequency at which Ground Station is communicating with Satellite The satellite Transponder converts the signal and sends it down to the second earth station. The satellite receives the uplink frequency and the transponder present inside the satellite does the processing function and frequency down conversion and then transmit the downlink signal at different frequency. Uplink/Downlink Frequency In satellite telecommunication, a downlink is the link from a satellite down to one or more ground stations or receivers, and an uplink is the link from a ground station up to a satellite. Uplink frequency is different from downlink frequency for following reason: The satellite transmitter generates a signal that would jam its own receiver; if both uplink and downlink shared the same frequency. Transmission loss diminishes as Frequency Decreases. This frequency is called a Downlink frequency Oct 29, 2014 satellite communication 5 6. The downlink frequency is the frequency which is used for transmission of signals from the satellite to the earth station receiver. The table below shows the main frequency bands used for satellite links. Oct 29, 2014 satellite communication 6 7. digital satellite uplink chain How it works: Digital data is sent to the modulator which takes the data and converts it into a modulated signal in the Intermediate Frequency range (70-140 Mhz). Advantages of satellite communication Point to Multi-point communication.

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