Hovering throttle setting

ArduCopter Copter 4.1
1

I am wondering why the ThH in the attached ThO vs ThH curve (from Wiki) is a curve (green), but the ThH curve attached (green) in my 250 size quad is made up of 2 to 3 segments of more or less straight lines. The MOT_THST_HOVER value in my quad is achived by constant hovering with MOT_HOVER_LEARN set to 2 (learn and save).
DF log attached.
Does anyone has any clue ?

My estimate may be my use of CPPM in CM703 (instead of PWM)…pls see attached the extract from KK2 manual about the choice of Rx. Do you think using standard PWM will yield a ThH curve following more closely to ThO ? Appreciate any input.

Arducopter V 4.1.2,
BL Heli 12A ESC,
Emax MT2204 2300kv,
FC : Revolution
Rx : Redcon CM703 using PPM output.
Tx : Jumper T16

Settng hovering throttle
Settng hovering throttle1366×768 252 KB

ThO vs ThH
ThO vs ThH1366×768 258 KB

Param.param (14.6 KB)
Rx selection from KK2 manual
Rx selection from KK2 manual1366×768 214 KB

Thanks
Frankie

2

The flight from the wiki is 5 times as long as yours, so will naturally have more data points. It is also possible, that lower specced FCs (like yours) simply estimate some parameters at a lower frequency due to resource constraints. I wouldn´t concern myself about this if you don´t have any related problems.

3

Thank you. These may be the possible reasons.