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Why are very low noise figures relatively unimportant for a high frequency receiver?
External HF noise, man-made and natural, are higher than the internal noise generated by the receiver
At HF frequencies (below 30 MHz), atmospheric and man-made noise levels picked up by the antenna are often much higher than the internal noise of a reasonably good receiver. Thus, further reducing receiver noise figure yields little improvement in signal-to-noise ratio.
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