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E4Edit

The E4 section of the Amateur Extra test contains information on amateur practices.

E4AEdit

The E4A section covers test equipment: analog and digital instruments; spectrum and network analyzers, antenna analyzers; oscilloscopes; testing transistors; RF measurements.
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E4BEdit

The E4B section covers measurement techniques: instrument accuracy and performance limitations; probes; techniques to minimize errors; measurement of Q; instrument calibration.
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E4CEdit

The E4C section covers receiver performance characteristics: phase noise; capture effect; noise floor; image rejection; MDS; signal-to-noise-ratio; selectivity.
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E4DEdit

The E4D section covers receiver performance characteristics: blocking dynamic range; intermodulation and cross-modulation interference; 3rd order intercept; desensitization; preselection.
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E4EEdit

The E4E section covers noise suppression: system noise; electrical appliance noise; line noise; locating noise sources; DSP noise reduction; noise blankers.
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