howto:hambasics:sections:practice
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Table of Contents
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Recall
Receivers
There are three main characteristics of a receiver.
Sensitivity
A signal is always accompanied by some sort of noise, and very roughly speaking, if the signal is stronger than the noise, then it can be heard. To quantify this, we use a term called Signal-to-Noise Ratio (SNR or S/N):
$$\text{SNR} = \frac{\text{Signal}}{\text{Noise}}$$
Since SNR is a ratio:
- If SNR > 1, then the signal is stronger
- If SNR = 1, then the signal and the noise have the same strength
- If SNR < 1, then the noise is stronger.
Like other ratios, we often express SNR in dB so that:
- If SNR > 0dB, then the signal is stronger
- If SNR = 0dB, then the signal and the noise have the same strength
- If SNR < 0dB, then the noise is stronger.
Transmitters
Questions
howto/hambasics/sections/practice.1595044919.txt.gz · Last modified: 2020/07/17 21:01 by va7fi