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Some modern spectrum analyzers traditionally still use so-called video filters. Since selectivity in the SRM is based on fast Fourier transformation (FFT), which simultaneously analyzes different frequencies, there is no need for a video filter. If
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No, this is not compulsory. Of course it is advisable to gain as much experience in the profession as possible. It will also lead to better results.
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Schools are free to determine the contents of their course. The VBW offers a fixed program. For the practical lessons that means approximately 70 different styles, techniques and variations; also theory and botany. This can be accomplished in 1
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There are some books for VBW courses published by the VBW. However licensed schools decide for themselves what will be offered in the course. Because of this there is much variation in quality. Most of the information needed can be found in the
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