On 1/9/2022 3:26 PM, Richard (Rick) Karlquist wrote:
The grounds for these independent systems are subject to considerable
voltage differences and will draw considerable current if you try to
connect them together. Note that for this purpose, "ground" and
"neutral" are the same circuit.
Engineers from BBC and ABC-TV were active members of the AES Standards
Committee, on which I have served for nearly a quarter century. ABC-TV
has (or had at that time) major facilities on opposite sides of a major
street in Manhattan, and the shields of video tie lines between them saw
exactly this problem in a big way. With audio, it could be solved with
transformers, but the signal bandwidth was far to great for video.
73, Jim K9YC
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