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JIMRI/help/en/manual/DecoderPro/Comp_Speed_Talble.shtml
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<h1 id="Top">DecoderPro&reg; Comprehensive Programmer</h1>
<h2>The Speed Table Pane</h2>
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<p><a href="Comp_Speed.shtml">Previous |</a> <a href="Comp_FMap.shtml">Next</a></p>
<p><a href="index.shtml#Advanced%20Programmer">Back to Index</a>
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<p>The <strong>Speed Table</strong> allows you to fine-tune the throttle response of your
locomotive. You might opt to match all of your locomotives so they run at the same speed for
the same throttle setting, or you might want to set the table up so that your locomotive runs
at the actual scale speed indicated by the throttle. Or maybe you have someone in your
operating group that likes to switch the yard at Mach 2.5, and you want to slow them down a
bit. There are a lot of ways to use this feature. (This feature may vary by manufacturer and
decoder series)</p>
<p>You now have the option of using <strong>Speed Table</strong> (this pane) which if
selected and written to the decoder will replace the <a href="Comp_Speed.shtml"><strong>Basic
Speed Control</strong></a> to set your locomotive's speed control mode. Which ever one you
select last and write to your decoder will be the method used for speed control. To select
the use of speed tables, the <strong>Use Table</strong> radio button is selected at the top
of the pane, and in the case of Soundtraxx and QSI decoders, the drop down selection box must
be used. See the discussion at the end of this section for an example.</p>
<p>Not all decoders allow speed table programming and some are limited to fixed curves,
usually selected by a drop-down list.</p>
<p>The default speed table for most decoders is a straight line from zero on the left to
maximum on the right. The <strong><span class="textbutton">Force Straight</span></strong>
button below the table duplicates that in the table..</p>
<h1 class="dp-ctr"><img style="width: 799px; height: 697px;" src=
"images/Speed_Table_Straight.png" alt="speed table">
</h1>
<p class="dp-ctr"><strong>Straight Line Speed Curve</strong>
</p>
<p>As you can see, you have both numbers and sliders to work with. Changing either a number
or slider will make the other change to match it. If you are CV inquisitive, you can use the
tool tip to advantage. By hovering over any of the sliders, the tool tip will reveal the CV
to which you are pointing .</p>
<p>The <span class="textbutton">Match ends</span> button
will also result in a straight-line graph, but you can offset the beginning and end by any
amount you wish. The first and last steps are used to set to minimum and maximum values for
the straight line. The function will then draw a straight line between those two end points.
Below is an example of the result.</p>
<h1><img src="images/Speed_Table_Match.png" alt="speed table match" height="315" width="914">
</h1>
<p>Now if you've used DecoderPro in the past, you're probably wondering what those little
boxes at the bottom of each slider are used for. Well, they're difficult to explain, but easy
to use. They basically allow you to set a slider to control every slider in columns to its
left as well as to its right. If you click two of the boxes and then move one of those
sliders you'll see that they are linked to the sliders between them. Points to the right
never are higher than the slider being moved, and the points to the left are never lower that
the slider being moved. This "always increasing left to right" is normally the way the
sliders worked, but now the ones in between the check are linked. If the slider is lowered
and then raised the straight line is drawn between the column checked to the right and the
column that the slider is controlling. It's difficult to describe, but try it and you'll
see.</p>
<p><br>
What could that possibly be used for, you ask? Well, many decoders (like the Soundtraxx
Tsunami in this example) do not support V-start, V-mid and V-max. So, if you are trying to
use the simplified method of speed matching locos, these decoders won't support it. Well now
you have a way. Check the left-hand, right-hand and middle columns. Set the left-hand column
to V-start, the right-hand to V-max and then slide the middle slider up and down until you
get the V-mid that you want. Now all you have to do is write this speed table to the loco and
you've accomplished what you wanted to do, but the decoder manufacturer didn't provide
for.</p>
<h1><img src="images/Speed_Table_SpeedMatch.png" alt="Speed Match" height="527" width="922">
</h1>
<p class="dp-ctr"><strong>Substitute for Quick Speed Matching</strong>
</p>
<p>If you want to set up a loco for switching you can set a start speed that is the same for
the first portion of the throttle revolution and lower the top speed for use in the yard as
shown below:</p>
<h1><img src="images/Speed_Table_Constant.png" alt="Speed Table - Constant Ratio Curve"
height="270" width="800">
</h1>
<p class="dp-ctr"><strong>Switcher Speed Curve</strong>
</p>
<p>if you don't desire a strait-line response curve there are other options available. The
Constant ratio curve gives you a response that increases slowly in the low end and rapidly at
high throttle. This function will also draw the curve between preset end points.</p>
<h1><img src="images/Speed_Table_Switcher.png" alt="switcher" height="335" width="807">
</h1>
<p class="dp-ctr"><strong>Constant Ratio Curve</strong>
</p>
<p>The <strong>Log curve</strong> reverses this response, giving you a logarithmic response
curve with high acceleration at low speeds, but topping out quickly. It will also draw the
curve between preset end points.</p>
<h1><img src="images/Speed_Table_Log.png" alt="log" height="345" width="851">
</h1>
<p class="dp-ctr"><strong>Logarithmic Speed Curve</strong>
</p>
<p class="cp-ctr">
</p>
<p>The <span class="textbutton">Shift left</span> button moves the entire
speed table to the left one space with each click on the button. The example below shows a
linear 0-255 speed table that has been <strong>Shifted left</strong> three times.</p>
<h1><img src="images/Speed_Table_ShiftLeft.png" alt="shift left" height="369" width="840">
</h1>
<p class="dp-ctr"><strong>Curve Shifted Left</strong>
</p>
<p>The <span class="textbutton">Shft right</span> button moves the entire
speed table to the right one space with each click on the button. The example below shows a
linear 0-255 speed table that has been <strong>Shifted right</strong> three times.</p>
<h1><img src="images/Speed_Table_ShiftRight.png" alt="shift right" height="331" width="824">
</h1>
<p class="dp-ctr"><strong>Curve Shifted Right</strong>
</p>
<p>Of course, you can enter the numbers individually or move the sliders one at a time to
create your own fully customized speed table. To aid you with setting the individual values,
the slider value is shown at the top of each slider. Also, by hovering the mouse at a slider
column the number of the CV being entered will be revealed.</p>
<p>One very important thing to remember: <span class="ACCENT"><strong>No matter how pretty
your speed table looks, it has absolutely no effect on the locomotive unless you write it to
the decoder!</strong></span></p>
<p>And this point is especially pertinent with the QSI and Soundtraxx Tsunami decoders,
because they have a separate drop down box like the QSI box below. They require that you
select the <strong>user defined</strong> speed table entry in this box or your table will not
be written to the decoder. Interestingly, Tsunami puts the selection at the bottom of the
list making it very easy to miss.</p>
<p class="dp-ctr"><img src="images/Speed_Table_QSI.png" alt="QSI speed table" height="308"
width="799">
</p>
<hr>
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<p><a href="Comp_FMap.shtml"></a> <a href="Comp_Speed.shtml">Previous |</a> <a href=
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<p><a href="index.shtml#Advanced%20Programmer">Back to Index</a>
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