AVMatrix FE1121-12G 12G SDI Fiber Optic Extender (TX + RX Kit)

AVMatrix FE1121-12G: Loss-Free SDI Transport Over Fiber

The AVMatrix FE1121-12G is a 12G/6G/3G-SDI fiber optic extender kit, a matched transmitter and receiver that carry SDI video up to 6.2 miles (10 km) over single-mode fiber with zero signal loss. It solves the problem of moving high-bandwidth video across a stadium, campus or building where copper coax simply cannot reach. Supporting resolutions up to 4K UHD 60Hz, it keeps a pristine signal end to end. For installers and broadcast crews, it turns a long, difficult cable run into a reliable, permanent link.

Why Fiber Beats Coax for Long SDI Runs

SDI over coax degrades with distance as high-frequency signal energy is lost, limiting practical runs to a few hundred feet. Optical fiber instead sends the signal as light, which travels miles with negligible loss and complete immunity to electrical interference. This kit converts SDI to light at the transmitter and back to SDI at the receiver, achieving up to 6.2 miles (10 km) on single-mode LC fiber. For any run beyond coax limits, fiber is the only dependable way to keep a clean 4K UHD 60Hz picture.

Signal Integrity: Equalization and Re-Clocking

Even a strong incoming SDI feed accumulates jitter and amplitude loss along the path. Equalization boosts the weakened high-frequency content of the signal, and re-clocking regenerates the timing to a clean reference, together rebuilding the waveform before it is transmitted. The FE1121-12G applies both so the delivered signal is broadcast-stable rather than marginal. Embedded audio and metadata ride along with the video. The result is a feed the downstream switcher or monitor treats as if the source were in the same room.

Flexible I/O for Monitoring and Distribution

The transmitter accepts an SDI input and provides an SDI loop output, letting an operator monitor the source locally while the fiber link runs. At the far end, the receiver delivers two SDI outputs so the extended signal can feed two destinations, such as a switcher and a confidence monitor, without an external distribution amplifier. The 12G design also supports 4K over roughly 197 feet of coax where a short copper hop is needed. Powered by low-consumption USB-C 5V, each unit runs off a small adapter or power bank and ships with mounting brackets for tidy installs.

Who the FE1121-12G Is For

This extender kit suits stadiums, large houses of worship, campuses, broadcast and OB operations, and fixed AV installs that must move 4K SDI between distant rooms or buildings. It fits live-event crews running cameras far from the control position, security and surveillance SDI links, and permanent backbones between production spaces. Anywhere coax falls short, this kit delivers a clean, interference-free signal. It is a set-and-forget solution for professional long-distance SDI.