[TowerTalk] Hazards of low soil conductivity

[Jim Brown]

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