[GreenKeys] How long can a local loop be?

[Harold Hallikainen]

In high school, I ran a single wire loop against ground for more than a
mile with 60mA loop current. This is really pretty low speed.

Harold

> Hi all,
> How long can a local loop be? Would a pair of TTYs work at a mile apart
> with twisted pair wire? Or would one need to start thinking about using a
> polar relay and dual current for mark and space? What would the circuit
> look like? At that distance (mile +), does one need to think about open
> wire and insulators?
> Thank you again!
> Best,
> Joe
> Consciousness affects the medium. Think happy, be happy, and happiness
> will follow
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