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LNBF - Theory, Functioning and Measures

LNBF - Theory, Functioning and Measures


1) Introduction to the Satellite Communication System;
2) LNBF operation;
2.1) Block diagram;
2.2) RF circuit;
2.3) Local oscillator;
2.4) Mixing circuit;
2.5) FI circuit
2.6) Voltage polarization switching;
2.7) Operation Band switching by pulse switching;
3) Types of LNBF Banda KU and their differences;
3.1) Universal LNBF;
3.2) LNBF multiple outputs;
3.3) LNBF output in single cable;
3.4) Customized LNBF
4) The main specifications of an LNBF;
4.1) Input Frequency (Polarization and Operation Bands);
4.2) Output Frequency (Polarization and Operation Bands);
4.3) Frequency of Local Oscillators;
4.4) Frequency Stability of Local Oscillators at Ambient Temperature and
Operating Temperature;
4.5) Phase Noise;
4.6) Leak from Local Oscillators;
4.7) Conversion gain;
4.8) Gain flatness;
4.9) 1dB compression point;
4.10) Noise Figure or Noise Temperature
4.11) 3rd order intersection point or 3rd order intermodulation products;
4.12) Rejection of Cross Polarization (Crosspol);
4.13) Return Loss or VSWR;
4.14) Spurious output;
4.15) Image Frequency Rejection
4.16) Polarization voltage switching range;
4.17) Current consumption.

5) Main Measures (Theory and practice)
5.1) Noise Figure Measurement;
5.2) Conversion gain;
5.3) Gain flatness;
5.4) Rejection of Cross Polarization;
5.5) Frequency of Local Oscillators;
5.6) Stability of Local Oscillators;
5.7) Phase Noise;
5.8) Intermodulation;

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