====== KK Xcopter 4.7 issue ======
There is a problem with the motor 4 signal on the Xcopter 4.7 firmware from kapteinKuk. To solve it I will post here some PWM readings I did with my logic analyser. 

===== How the experiment was done =====

I used my Futaba T10 with Frsky module using a V8 7-channel receiver. The value of the throttle channel was set in the servo monitor of the TX, so I was able to set the value every time the same.
I recorded the output of M1-M4 and the throttle input signals with a logic analyser, 1 million samples at 50kHz. The PWM signal had a accuracy of +-2%.
I used two boards to do the first experiment:
  * board1 kk 5.5 brand new, from GLB. ATmega168p.
  * board2 kk 5.5 recently flashed, broken Yaw gyro, from GLB. ATmega168p.
  * board3 kk 5.5 brand new, from kkmulticopter.com. ATmega328p.

Tested firmwares are:
  * KK Quadrocopter 4.7
  * kk XCopter 4.7 
  * KKAJ XCopter 1.1.2
===== Results =====

==== KK Quadrocopter 4.7 ====
PWM refresh of M1-M4: 299.4 Hz

<columns 100% 33% ->
^board1^^^^^^^
^  TX  ^^  KK board  ^^^^^
^Stick pos^Thr value^Thr value^M1^M2^M3^M4^
|  12%|  -92|  |  |  |  | |
|  25%|  -62|  1.26|  1.12|  1.28|  1.10| 1.10|
|  50%|  0|  1.52|  1.38|  1.52|  1.34| 1.20|
|  75%|  63|  1.78|  1.62|  1.78|  1.60| 1.44|
|  100%|  125|  2.04|  1.88|  2.00|  1.86| 1.68|
<newcolumn>
^board2^^^^^^^
^  TX  ^^  KK board  ^^^^^
^Stick pos^Thr value^Thr value^M1^M2^M3^M4^
|  12%|  -92|  1.16|  1.08|  1.18|  1.08| 1.08|
|  25%|  -62|  1.28|  1.14|  1.32|  1.10| 1.08|
|  50%|  0|  1.54|  1.38|  1.58|  1.38| 1.18|
|  75%|  63|  1.78|  1.64|  1.82|  1.60| 1.42|
|  100%|  125|  |  |  |  |  |
<newcolumn>
^board3^^^^^^^
^  TX  ^^  KK board  ^^^^^
^Stick pos^Thr value^Thr value^M1^M2^M3^M4^
|  12%|  -92|  1.14|  1.02|  1.02|  1.02| 1.02|
|  25%|  -62|  1.26|  1.16|  1.18|  1.12| 1.12|
|  50%|  0|  1.52|  1.36|  1.48|  1.36| 1.24|
|  75%|  63|  1.78|  1.64|  1.74|  1.62| 1.48|
|  100%|  125|  |  |  |  |  |
</columns>
==== KK XCopter 4.7 ====
PWM refresh of M1-M4: n Hz

<columns 100% 33% ->
^board1^^^^^^^
^  TX  ^^  KK board  ^^^^^
^Stick pos^Thr value^Thr value^M1^M2^M3^M4^
|  12%|  -92|  1.16|  1.02|  1.02|  1.02| 1.02|
|  25%|  -62|  1.26|  1.22|  1.18|  1.18| 1.10|
|  50%|  0|  1.50|  1.48|  1.44|  1.42| 1.10|
|  75%|  63|  1.78|  1.74|  1.70|  1.68| 1.38|

<newcolumn>
^board2^^^^^^^
^  TX  ^^  KK board  ^^^^^
^Stick pos^Thr value^Thr value^M1^M2^M3^M4^
|  12%|  -92|  1.14|  1.12|  1.10|  1.08| 1.08|
|  25%|  -62|  1.28|  1.26|  1.24|  1.20| 1.08|
|  50%|  0|  1.54|  1.50|  1.50|  1.48| 1.10|
|  75%|  63|  1.78|  1.74|  1.74|  1.72| 1.30|
<newcolumn>
^board3^^^^^^^
^  TX  ^^  KK board  ^^^^^
^Stick pos^Thr value^Thr value^M1^M2^M3^M4^
|  12%|  -92|  1.14|  1.02|  1.02|  1.02| 1.02|
|  25%|  -62|  1.26|  1.12|  1.26|  1.12| 1.12|
|  50%|  0|  1.54|  1.34|  1.56|  1.30| 1.32|
|  75%|  63|  1.80|  1.62|  1.76|  1.58| 1.52|
</columns>
==== KKAJ XCopter 1.1.2 ====
PWM refresh of M1-M4: 256 Hz

^board1^^^^^^^
^  TX  ^^  KK board  ^^^^^
^Stick pos^Thr value^Thr value^M1^M2^M3^M4^
|  12%|  -92|  1.16|  1.02|  1.02|  1.02| 1.02|
|  25%|  -62|  1.28|  1.22|  1.20|  1.20| 1.10|
|  50%|  0|  1.54|  1.42|  1.40|  1.40| 1.30|
|  75%|  63|  1.78|  1.64|  1.64|  1.64| 1.54|