This AJA HD5DA 1x4 distribution amplifier and repeater is a great choice for HD/SD - SDI applications. It doesn't come with a power supply. Keep this in mind when making your purchase.

To use this AJA HD5DA 1x4 distribution amplifier and repeater, first, make sure you have a suitable power supply as it's not included. Connect your HD/SD - SDI source to the input of the device. Then, you can connect up to four output devices to the outputs for signal distribution. When it comes to maintenance, keep the device in a clean and dry place. Make sure to handle the cables gently to avoid any damage. Also, check the connections regularly to ensure a stable signal. If you notice any issues with the signal quality, double - check all the connections and the power supply.