Lab-05-a: Noise
Figure Analysis
Use http://www.rfdh.com/rfdb/nf.htm
1. Find the system noise figure and the noise
temperature of the following receiver. This receiver has a large noise figure
because a long cable with loss of 6 dB connects an antenna to a preselector filter.
2. Find the system noise figure and the noise
temperature of the following receiver where we have placed an LNA as the first
element after the antenna. As a result, this receiver has a much smaller noise
figure than the previous receiver.
3. Interchange the first BPF with the cable. Find
the system noise figure and the noise temperature. Is there any change?