Amateur ExtraE1B01
Which of the following constitutes a spurious emission?
D
Answer
Extra class rules and station restrictions
Type
A
An amateur station transmission made without the proper call sign identification
B
A signal transmitted to prevent its detection by any station other than the intended recipient
C
Any transmitted signal that unintentionally interferes with another licensed radio station and whose levels exceed 40 dB below the fundamental power level
D
An emission outside the signal’s necessary bandwidth that can be reduced or eliminated without affecting the information transmitted
Answer Notes
By FCC definition, a spurious emission is any radio frequency energy emitted outside the necessary bandwidth of a signal that can be reduced or eliminated without negatively affecting the transmitted information. Common examples include harmonics, parasitic emissions, and intermodulation products.
Other options presented describe different rule violations or specific technical standards. For instance, transmitting without proper identification or attempting to obscure a message's meaning are operational violations, not spurious emissions. The option mentioning a 40 dB reduction confuses the definition of the term with specific attenuation requirements for certain transmitters.
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Which of the following is an acceptable bandwidth for digital voice or slow-scan TV transmissions made on the HF amateur bands?