[GreenKeys] How long can a local loop be?

[Chuck]

For use in the U.S Military the Loop Supply was provided from the highest 
station in the Loop/Net.  This would be the next Command level E.G. 
Battalion to Company or if a larger net the the Battalion C.P would provied 
the "Loop Battery" for the loop to all the Companys in the Network.
Most of the "loops" were in series so you would know when a Station was off 
line/out of service, as the line was open for all stations.

THEn we had to find out WHO was down/off line and what to do about it!!!


Chuck McClurg
SSG(R'td)
U.S. Signal Corp 1961-1993



----- Original Message ----- 
From: "Ken Wiebe" <me at networkguy.com>
To: "Thomas Tillson via GreenKeys" <greenkeys at mailman.qth.net>
Sent: Thursday, June 13, 2019 8:58 PM
Subject: Re: [GreenKeys] How long can a local loop be?


> Where did the loop power come from?
>
> On Thu, Jun 13, 2019, at 19:14, Duncan Brown wrote:
>> Teletypewriters were originally designed to operate in DC loops with a
>> ground return.
>>
>> The specification for the Signal Corp's TT-4/PGC-1 was 25 miles at 60
>> wpm and 15 miles at 100 wpm (depending on ground conditions). This was
>> with 60 ma loop and ground return. This was machine to machine. They
>> did not use polar relays except in repeaters to extend the range.
>>
>> have fun,
>>
>> Duncan
>> K2OEQ
>>
>> On 6/13/2019 17:19, Joe Herdler via GreenKeys wrote:
>> > 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 you.
>> >
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> ______________________________________________________________
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