Ham Radio Extra Class Practice Test 2026 - Free Extra Class License Exam Questions and Study Guide

In fast-scan television (FSTV) used in amateur radio, several methods can be employed to transmit accompanying audio, making the correct choice "All of these choices are correct."

The frequency-modulated sub-carrier is a prevalent technique where the audio signal is modulated onto a sub-carrier frequency that is separate from the video signal. This method allows the audio to be transmitted alongside the video efficiently and can be demodulated by the receiving equipment to provide high-quality sound.

Using a separate VHF or UHF audio link is another common approach in which the audio is transmitted on a different frequency band altogether. This is particularly useful for points where there might be interference or where space limitations prevent efficient transmission within the same frequency.

Frequency modulation of the video carrier is also utilized, where the audio modifies the frequency of the video carrier directly. This integrates the audio into the same signal as the video, allowing for simultaneous transmission.

Given that each of these methods can effectively transmit audio alongside video in amateur fast-scan television applications, the answer acknowledges the validity of all these techniques in the context of FSTV.