Study E2E04 - Hamboozler

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E2E04

If an oscilloscope is connected to a TNC or terminal unit and is displaying two crossed ellipses, one of which suddenly disappears, what would this indicate about the observed signal?

Select	Answer
A	The receiver should be retuned, as it has probably moved at least 5 kHz from the desired receive frequency
B	One of the signal filters has saturated
C	The mark and space signal have been inverted and the receiving equipment has not yet responded to the change
D	The phenomenon known as selective fading has occurred