[GreenKeys] Open lines?

[amourdutigre]

Hi all..

I have been perusing my copies of the greenbooks, (I have the last two, and am shopping for the first two), and was fascinated by the fact that the longlines engineers would phantom a third call upon two pairs of open lines. I have several questions about this.

First, are there anymore open line circuits still in operation?

Second, if there are say four pairs of wires, ("sides"), could you at least theoretically phantom up to six other calls on those four wires? One phantom circuit between each possible pairing of pairs so to speak.

Just some thoughts, though I suspect that it would be theoretical, that it would be quite impractical due to balancing issues.

Best and 73,

Joe KB0TXC
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