A satellite ground-station receiver has a noise-equivalent bandwidth and a noise figure

PHYSICS · Multi-part · Fermi University Physics · Electronics, Instrumentation & Communication · Communication systems and RF engineering · Communication systems and RF engineering

Electronics for Measurement, Ch Modulation, receivers and the link that carries the measurement

Problem

A satellite ground-station receiver has a noise-equivalent bandwidth

B=1\,\mathrm{MHz}

and a noise figure

\mathrm{NF}=1.5\,\mathrm{dB}

, both referred to

T_0=290\,\mathrm{K}

. ((a)) Calculate its noise floor in dBm. ((b)) A second receiver has

B=25\,\mathrm{kHz}

and

\mathrm{NF}=8\,\mathrm{dB}

, giving a noise floor of

-122.0\,\mathrm{dBm}

. State whether the ground-station receiver's floor is better or worse, and by how many decibels.

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