TTX404 TRANSMITTER (Tx) The TTX404 airplane transmitter is available in either a “Mode 2” confi guration with throttle on the left and elevator on the right, or “Mode 1” confi guration with throttle on the right and elevator on the left. Mode 2 radios are most commonly used in the U.S., whereas Mode 1 radios are popular in other.
Note The correct PWM ranges for selectable modes are shown alongside each mode selection dropdown in the Mission Planner Flight Mode screen (see ). If you want to just support three modes (using a three position switch) then you would configure the transmitter to produce PWM pulse widths of 1165, 1425, and 1815 microseconds for the respective switch positions. If you want to support 6 modes then the transmitter will need to emit PWM widths of around 1165, 1295, 1425, 1555, 1685, and 1815 milliseconds. Typically this is achieved by configuring the transmitter to mix a two position switch and a three position switch (giving 6 modes in total). You can also do this with an analog dial if one is available, but it’s hard to reliably turn a dial to just the right position for six distinct settings. The sections below provide links showing how to configure transmitters from different manufactures, and how to test (in Mission Planner) that each switch setting is emitting the appropriate PWM signal. Spektrum DX8 (alternate method) This section describes an alternative way to set 6 modes with the Spektrum DX8.
This method uses the Gear switch and the Flight mode switch. All the other switches can be assigned as preferred. This method also allows each mode to be set in the middle of each mode’s pulse width range so small changes will not change modes. Use Mission Planner Flight Modes setup to monitor the Current PWM for these adjustments. Setup the switches (required for the 6 modes).
Hold roller bar down, turn on DX8, scroll down to Switch Select, Click roller bar. Set switches as follows:. Gear = Gear (Channel 5). FMode = Inh Not assigned to a channel – Used to mix with Gear Sw (Channel 5) for 6 modes. Others anyway you want. One method is as follows:.
Knob to aux1 = channel 6 for camera tilt / tuning. Mix = aux2 = channel 7 to save Way Point or RTL, auto trim or other settings in APM configuration.
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Flap to aux3 = channel 8 for other uses. Click BACK until the normal screen appears, or turn off power, then turn power back on. Set up the non-mixed servo setting for channel 5 (Gear channel controlled by the Gear Switch) This will be the values with no mixing - F Mode switch in the 0 position and sets the lowest pulse width to 1165 ms (mode 1) and highest to 1815 ms (mode 6). Click the roller bar, scroll down to Servo Setup, Select the Gear channel, Select Sub Trim. Set sub trim to 0.
Select Travel. Set travel (left, position 0) for 1165 ms pulse (90%). Set travel (right, position 1 for 1815 ms pulse (74%). Set up Mix 1 to change the Gear Pulse width when F Mode is in position 1. Click roller, scroll down to Mixing, click roller, scroll to first line under Mix (has xxx xxx, AIL RUD, or some other mix set),click roller, Select Mix 1, Click roller. Set Mix: Gear Gear.
Gear changes Gear depending on Switch F Mode setting. Set Offset = 0, Trim = Inh. Set SW = FM 1.
Set the F Mode switch on the transmitter to position 1. Set the Gear switch on the transmitter to position 0. Set top Rate for pulse width of 1290 ms for mode 2 (-35%) (change = 400 ms.90%.35% = 126 ms. Result = 1165 ms + 126 ms = 1251 ms = mode 2). Set the Gear switch on the transmitter to position 1.
Set bottom Rate for pulse width of 1685 ms for mode 5 (– 45%) (change = 400 ms. +73%.- 45% = -131 ms. Result = 1815 ms - 131 ms = 1684 ms = mode 5).
Set up a mix 2 to change the Gear Pulse width when F Mode is in position 2. Mix: Gear Gear.
Gear changes Gear depending on Switch F Mode setting. Set Offset = 0, Trim = Inh. Set SW = FM2. Set the F Mode switch on the transmitter to position 2.
Set the Gear switch on the transmitter to position 0. Rate top Rate for pulse width of 1425 ms for mode 3 (–72%) (change = 400 ms. –90%.
– 72% = 259 ms. Result = 1165 ms + 259 ms = 1424 ms = mode 3). Set the Gear switch on the transmitter to position 1. Set bottom Rate for pulse width of 1550 ms for mode 4 (–89%) (change = 400 ms. +73%. – 89% = -262 ms.
Result = 1815 ms - 262 ms = 1553 ms = mode 4).
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