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Voltage drop on a reverse loop

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  • Member since
    June 2004
  • From: Orig: Tyler Texas. Lived in seven countries, now live in Sundown, Louisiana
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Posted by jeffrey-wimberly on Sunday, October 19, 2008 7:40 AM

 Many times the most obvious solution to a problem is the one that seems to be too simple to work.

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Posted by paulney on Saturday, October 18, 2008 9:50 PM
Durrr...!! So simple! Thank you!
  • Member since
    February 2002
  • From: Reading, PA
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Posted by rrinker on Saturday, October 18, 2008 9:43 PM

 You can split off the output of the AR-1 and run as many feeders as you want to the insulated section. As long as they all come from the AR-1, there won;t be any issue with shorting. Think of the AR-1 as the Zephyr and the insulated section of the loop as your entire railroad - any number of feeders would be just fine.

                       --Randy


Modeling the Reading Railroad in the 1950's

 

Visit my web site at www.readingeastpenn.com for construction updates, DCC Info, and more.

  • Member since
    March 2008
  • 20 posts
Voltage drop on a reverse loop
Posted by paulney on Saturday, October 18, 2008 9:09 PM

Hello, everyone!

I have finally put the last piece of roadbed and track on the layout, and now it's time to properly power everything! The track is live, trains are running fine, but I wanted to add more redundancy in terms of wires feeding track current.

As I read on the forums, the general rule of thumb is to have a set of feeders every 8 feet or so. For the most part I do. But I have two reverse loops controlled by AR-1. Per AR-1 instructions, the isolated section should be as long as the longest train that will be running on the track, so I set up breaks at the entry and exit points of the loop, and feed them via AR-1. That's all fine and dandy: the locos seem to be running without any trouble. But wouldn't the voltage drop be considerable over the length of the loop (more than 8 feet)? How can I add extra feed somewhere to the middle of the loop without short-circuiting the section?

Also, while we are on the subject of power wires: do you run an individual feed back to the power source or do you hook onto another bus by splicing it?

The whole system is powered by Digitrax Zephyr.

 Thank you.

 

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