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Unread 17-02-2015, 12:51
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Re: voltage loss over long runs

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Originally Posted by GeeTwo View Post
This falls under the heading of sprawl.
Or you get a number using 30' and divide by 5 or 10 - you get a better number for the shorter run that way.
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Unread 17-02-2015, 13:28
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Re: voltage loss over long runs

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Originally Posted by wireties View Post
Or you get a number using 30' and divide by 5 or 10 - you get a better number for the shorter run that way.
??
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Unread 17-02-2015, 13:53
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Re: voltage loss over long runs

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Originally Posted by GeeTwo View Post
??
The relationship of the effect on a longer run scales (almost linearly) to a shorter run - not true? Impedance per unit length is a key component of the equation, correct?
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Unread 17-02-2015, 14:14
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Re: voltage loss over long runs

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Originally Posted by rich2202 View Post
Not tall, but go look at Team 148 (batman thread). They have a 30 foot or longer tether. Drive wheels are on the robot with the battery, but the tethered piece has motors for lift.
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Originally Posted by GeeTwo View Post
This falls under the heading of sprawl.
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Originally Posted by wireties View Post
Or you get a number using 30' and divide by 5 or 10 - you get a better number for the shorter run that way.
Quote:
Originally Posted by GeeTwo View Post
??
Quote:
Originally Posted by wireties View Post
The relationship of the effect on a longer run scales (almost linearly) to a shorter run - not true? Impedance per unit length is a key component of the equation, correct?
This is true, and I wasn't arguing that it wasn't. I was just having difficulty parsing your earlier quote, and especially how that might not mean that the Batman and Robin tether was a case of sprawl.
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Last edited by GeeTwo : 17-02-2015 at 14:18.
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Unread 17-02-2015, 14:27
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Re: voltage loss over long runs

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Originally Posted by GeeTwo View Post
This is true, and I wasn't arguing that it wasn't. I was just having difficulty parsing your earlier quote, and especially how that might not mean that the Batman and Robin tether was a case of sprawl.
No worries, several different contexts here I reckon - your OP used 3' and 6' as examples thus the 5 and 10 divisor.
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Unread 18-04-2015, 23:59
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Re: voltage loss over long runs

Coming back and reading this thread I can't help but laugh at the fact that 1296 ended up having a tethered bot.
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Unread 19-04-2015, 01:55
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Re: voltage loss over long runs

I get teased about it quite often. ;o)
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Unread 19-04-2015, 10:46
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Re: voltage loss over long runs

With some of the long wire runs we are seeing this year, you may also want to watch out for the weight of your wiring. We have been through multiple cycles of weight reduction and I have concluded that we could have laid out our electronics better and dropped some excess weight. I used a kitchen scale and found that 18 feet of 12AWG wire weighed 0.494 pounds. That was about how much wire we would have needed to add a pair of motors up front for an active intake mechanism.
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