Question Pool -- Category E2D
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?
-
A.
- The phenomenon known as "selective fading" has occurred
-
B.
- One of the signal filters has saturated
-
C.
- The receiver should be retuned, as it has probably moved at least
5 kHz from the desired receive frequency
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D.
- The mark and space signal have been inverted and the receiving
equipment has not yet responded to the change
See answer.
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