[GreenKeys] polar loops

[gil smith]

Hi folks:

Can anyone give a decent explanation of a polar loop?  Eugene apparently 
has a polar machine, and wants to drive it -- I presume there are other 
polar machines out there as well, though we don't hear much about them.

If I understand it correctly, a polar loop reverses the current direction 
for mark/space, unlike the current-on/off of a normal loop.  I presume 
polar lines would support longer distances and do better under noisy 
conditions.

What is needed to convert a standard loop to drive a polar machine?

Can Eugene's 5A machine get a simple wiring change to bypass the polar 
input and drive the selector magnets directly from a normal loop?

ps:  Eugene:  do you have any pics of your machine?

thanks,

gil


At 05:44 AM 5/25/2004, you wrote:

>Hi Gil, any chance your board can be modified to support a "polar" loop 
>instead of a "neutral" loop? I am not even sure what I mean, but I think 
>my teletype (western union 5A) ticker requires polar and might be 30ma.
>
>Eugene

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