This Kramer VP - 470 digital scaler is a great choice for 3G HD–SDI video scaling. Note that it does not come with a power supply.

Using the Kramer VP - 470 is quite simple. First, connect your 3G HD–SDI video source to the scaler. Since it doesn't have a power supply, you'll need to use your own suitable power source to power it up. When connecting, make sure the cables are firmly plugged in to avoid signal loss. As for maintenance, keep it in a clean and dry place. Regularly check the connections to ensure they're still secure. Also, don't expose it to extreme temperatures or humidity as this can damage the internal components. If you encounter any issues, it's best to consult a professional.