Writing 3 texts of 5,000 characters (with signal modulators)

1. how to convert hdmi to rca (5,000 characters)

- How this is works?

- Do i need hdmi to rca converter?

2. qam modulators (5 thousand characters)

- how it works

- qam hdmi modulator

- qam encoder modulator

3. atsc modulators (5 thousand characters)

- atsc rf modulators

- atsc hdmi modulator