[GreenKeys] How long can a local loop be?

[Raymond Cote]

In Hawaii i was connected to the Navy TTY center on a balanced line and it was at least 2 miles. We both were using ASR28 machines if that makes any difference. Worked FB
Ray
KD9CCZ


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On Jun 13, 2019, at 16:42, Harold Hallikainen <harold at w6iwi.org<mailto:harold at w6iwi.org>> wrote:

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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