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Macrovision is hidden in the vertical sync bar on a few lines as a white line signal of varying intensity. It dips below 100 units IRE and the recording unit's sync passes some video for a bit until the line floats up to around 140 units of video. Above 100, the recording unit's automatic video level kicks in and tries to crush the video back to 100 which also crushes the recording sync level down below usable and the picture falls apart. Some recorders have Macrovision sensing inside and give you the "cannot record" warning. These adapters usually just reinsert new sync on the transmitted signal. RF is not the problem, it is doing its fine job getting the signal there.
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“Once you eliminate the impossible...whatever remains, no matter how improbable, must be the truth." Sherlock Holmes.
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06-18-2019, 05:01 PM
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