<p class="MsoNormal" style="margin: 0in 0in 0pt">I just hacked into the JR MAX-44 four channel transmitter and added the fifth channel by connecting a switch as shown in first two pictures.</p><p class="MsoNormal" style="margin: 0in 0in 0pt"><o></o></p><p class="MsoNormal" style="margin: 0in 0in 0pt">I knew it transmits six PPM pulses as the fifth and sixth channel servo holds the position to one extreme. I looked for some pictures of MAX-66 PCB connections on the web and by short circuiting the T15 and T13 terminals on the PCB found the fifth channel.</p><p class="MsoNormal" style="margin: 0in 0in 0pt"><o></o></p><p class="MsoNormal" style="margin: 0in 0in 0pt">I was expecting the same for sixth channel on the other end of PCB for terminal T15D and T14 as shown in third picture but it did not work. I do not have oscilloscope to observe the correct signals, so if someone out there has experience or equipment to dig into this I am pretty sure to convert this to six channel radio.</p>