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Interference with consumer electronics; grounding; DSP

Which of the following might be useful in reducing RF interference to audiofrequency devices?

B. Bypass capacitor

Which of the following could be a cause of interference covering a wide range of frequencies?

C. Arcing at a poor electrical connection

What sound is heard from an audio device or telephone if there is interference from a nearby single-sideband phone transmitter?

C. Distorted speech

What is the effect on an audio device or telephone system if there is interference from a nearby CW transmitter?

A. On-and-off humming or clicking

What might be the problem if you receive an RF burn when touching your equipment while transmitting on an HF band, assuming the equipment is connected to a ground rod?

D. The ground wire has high impedance on that frequency

What effect can be caused by a resonant ground connection?

C. High RF voltages on the enclosures of station equ

What is one good way to avoid unwanted effects of stray RF energy in an amateur station?

A. Connect all equipment grounds together

Which of the following would reduce RF interference caused by common-mode current on an audio cable?

A. Placing a ferrite bead around the cable

How can a ground loop be avoided?

D. Connect all ground conductors to a single point

What could be a symptom of a ground loop somewhere in your station?

A. You receive reports of "hum" on your station's transmitted signal

Which of the following is one use for a Digital Signal Processor in an amateur station?

B. To remove noise from received signals

Which of the following is an advantage of a receiver Digital Signal Processor IF filter as compared to an analog filter?

A. A wide range of filter bandwidths and shapes can be created

Which of the following can perform automatic notching of interfering carriers?

B. A Digital Signal Processor (DSP) filter

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