RF modulators convert video to RF (radio frequency) so the video can be transmitted to a television via its RF input. 8VSB is the modulation standard for American over the air broadcast. It is the RF modulation format used to deliver MPEG-2 encoded content to television sets in North America. Our TVB598 8VSB modulator PCIe card transmits real time video or stored video from the server hard drive and sends it to multiple HD monitors simultaneously, using RF as a carrier. The TVB598 8VSB can connect via an antenna or coaxial cable and features RF output.