ATS or Revolution Mixing, or Anti Torque Compensation - This is " Automatic Tail System". This refers to the radio mixing in a certain amount of tail rotor when the throttle / pitch is increased or decreased.
ATV or ENDPOINTS - This is "Adjustable Travel Volume". This refers to the amount of movement the servo has when the stick is moved from one extreme to another.
Collective Pitch - This is the ability to vary the main blade pitch when the throttle is increased or decreased.
Constant Drive Tail - This is a special autorotation clutch that will always drive the tail rotor even when the engine is off or in "Hold".
Curves - This is the end shape of the different funtions, like the "Pitch Curve", or "Throttle Curve". On the computer radio's you might have a 5 point curve. You will be able to set the low point, 1/4 point, 1/2 point or hover point, 3/4 point, and high point. Some radio's will have more and some less. At those particular points you can vary where the servo's output will be. On non computer radio's you should be able to at least control the low and high points.
Hold or Engine Hold - This is a switch that will take the engine to a preset idle position and will disengage the engine clutch. While in "Hold" though you will have full control of the "Collective Pitch". This allows you to practice "Autorotation" providing you have a autorotation clutch in your helicopter. This clutch will let the main blades free spin with out driving the tail rotor. There are certain conditions where you might want to drive the tail rotor. You can drive the tail rotor with special items called a "Slipper Clutch" or a "Constant Drive Tail".
Hovering Pitch - This is the amount of pitch you will need to hover the helicopter. On average this is about 5 degrees. Most helicopter radio's will have a knob on the transmitter to vary the amount of pitch at the present hovering stick position.
Hovering Throttle - This is the amount of throttle you will need to hover the helicopter. On average this is about 50% throttle. Most helicopter radio's will have a knob on the transmitter to vary the amout of throttle at the present hovering stick position.
Idle Up - This funtion is controlled by a switch and what it does is keep the engine speed at a present position when the throttle stick is lowered past that point. This way you can get into the negative range of pitch and will keep the blades spinning with out taking the engine to an idle. Some helicopter radio's will have either one or two "Idle - Ip's".

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