Ham Radio Extra Class Practice Test

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Prepare for the Ham Radio Extra Class Test with flashcards and multiple choice questions. Each question includes explanations to enhance your learning and confidence. Ensure your success on exam day!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

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How many times per second is a new frame transmitted in a fast-scan (NTSC) television system?

The correct answer is: 30

In a fast-scan (NTSC) television system, a new frame is transmitted at a rate of approximately 30 frames per second. This frame rate is a standard in NTSC broadcasting, which utilizes interlaced scanning. Although the system refreshes the image on the screen at a higher frequency due to the interlaced nature, whereby each frame is made up of two fields, the effective frame rate remains at about 30 frames per second. Understanding the distinction between fields and frames is crucial here. Each frame in an NTSC system consists of two fields that are transmitted alternately. While the fields are transmitted at 60 fields per second (30 frames made up of 60 fields total), the rate at which new full frames are delivered to the viewer is indeed 30. This is why the chosen answer accurately reflects the frame transmission rate in the NTSC system.