Your quest: Find an RF modulator
Back in the Old Days it was rare for enthusiast hardware to be able to output to a consumer television directly because of the stringent standards set by the FCC for radio frequency generation in the TV broadcast band. So, an enthusiast would either pay for a video monitor or purchase an RF modulator. The modulator would take a video signal as input and use it to modulate a TV carrier for a broadcast channel, usually channel two or channel three.
The older video game console systems also used an RF modulator; some had an internal version of such.
Nowadays, most consumer televisions have direct video inputs, so an RF modulator is not needed. This is a good thing as I'd guess that old RF modulators are hard to find today.
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