Hi, Maybe I can help with this. I didn't watch the video, mainly because I pay per byte of data so movies are almost out. A block converter, whether up or down or inverted, works by mixing with the signal or an IF (intermediate frequency) another frequency, which produces the IF + frequency, IF - Frequency and IF * frequency and multiples of the combinations. By making an amplifies for the selected +, - or multiple where the amplification is selective in frequency you can end up with a new frequency with all the attributes of the original. In fact most radios do just that by using a lower IF and then whatever the demodulator needed to recover the information on the transmission. By making the the range of the frequency very wide along with the IF amplification, you can move a block of transmissions up or down in frequency. This in done in satellites when a group of up-link transmissions are 'translated' to a different and then the 'band' is flipped over so the higher going in are now the lower going out. This is usually called a 'transverse' type device.
Most home dish receivers do this with what is know as a LNA or LNB for Low Noise Amplifier or Low Noise Block. Here the whole group of channels are moved in frequency to facilitate the receiver the ability to tune the correct channel. It's a common practice for most radio or communications equipment to use this technique so they don't have to deal with the high frequencies involved in the original transmission frequencies. This is a simplified example,but I hope it answers your question. Jack
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