From what I understand, you want to go from a RunCam (analog) signal to the Herelink which only accepts HDMI signal. So you need a Analog to HDMI converter like the one I recommended. You will take the video signal from the camera and run it into the converter. You will need to supply 5V power to the camera and converter. Then have a HDMI cable from the converter to the Air Herelink HDMI 1 or 2 Input.
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