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!

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What is the function of the Vertical Interval Signaling (VIS) code sent as part of an SSTV transmission?

To lock the color burst oscillator in color SSTV images
To identify the SSTV mode being used
To provide vertical synchronization
To identify the call sign of the station transmitting

The correct answer is: To identify the SSTV mode being used

The Vertical Interval Signaling (VIS) code plays a crucial role in SSTV (Slow Scan Television) transmissions. Its primary function is to relay important information about the specific SSTV mode that is in use. This is essential because there are several different modes of SSTV, each having unique characteristics in terms of resolution and color handling. By including the VIS code, a receiving station can automatically determine how to process the incoming image correctly, ensuring proper decoding and display. The other aspects of SSTV transmission, such as color synchronization and vertical alignment, are managed through other mechanisms in the system. For example, the color burst oscillator is needed for color images but isn't directly tied to the VIS code. Similarly, while vertical synchronization is important for reconstructing the image, it operates independently from the VIS code, which is solely aimed at mode identification. The VIS code does not carry call sign information, distinguishing its function from identification purposes found in other types of amateur radio transmissions.