Discussion
Why does a very low noise front end buy little at medium wave?
Answer: A
At those frequencies atmospheric and man-made noise arriving at the antenna exceed anything the receiver adds, so improving the receiver's own noise figure changes the signal-to-noise ratio hardly at all. Bandwidth affects both contributions equally. Thermal noise density is flat with frequency. And antenna inefficiency attenuates signal and external noise together. Knowing which noise dominates decides whether an improvement is worth paying for.
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