Spectrum DX8 2 Switches 1 TX channel 6 Flight Modes

Spectrum DX8 

2 Switches   1 TX channel

6 Flight Modes

You don’t need to sacrifice 1 RX channel to mix 6 Flight Modes out of two switches.

Just mix Aux2 to itself in 3 different ways depending on the position of the

F Mode switch.  You need to have Flight Mode enabled with the F Mode switch.

First go to Servo Setup and set Aux2 Travel to 85%

Then go to Mixing and select Mix 3, 4 and 5 und set it up as shown in the following pictures.

You will then get the Flight Modes a pictured below.

The good thing is, if the Flap/Gyro switch is in the middle (pos1) you always get

APM Flight Mode 4, which you could assign to Stabilize. 

So you have still the channel Rud and Aux3 free for other useful things.

Views: 41330

Comment by Manfred Dickgiesser on February 14, 2013 at 10:11pm


I would turn down the sensitivity with  the parameters of the APM in the MP




and not with the RC Expo settings.


My configurations files of the TX8

Comment by Gustavo A.Vargas on February 15, 2013 at 5:54pm

Hey Peter, 

I have one hexa APM2.5 with the same tx/rx as you do. In order to achieve what you want (reducing the sensitivity for yaw and pitch control) you can do either two things or both:

  1. In your Spektrum DX8 press and hold the roller while you turn Tx on. Then scroll down to “switch selector” menu and habilitate "knob" for channel AUX_1, AUX_2, or AUX_3 according to your particular setup at Rx. (Remember that the assigned AUX_# connector cable in your Rx must go from the previously assigned channel for the knob to the channel #6 in the APM board). Then go to Mission Planner > Parameters > and look down for “Channel 6 Tuning (TUNE)” parameter: there you choose the parameter you want to tweak by using the knob. Needless to say, you should calibrate your Tx previously from going to parameters menu in MP. That’s it. Before any change, record your default values. Be cautious while flying on tweaking so hard up or down!.
  2. Go to Tx menu “D/R and Exponential” scrolling the roller. Reduce D/R and increase (positive values) the Exponential. D/R affects the overall travel: for example, if you set D/R to 80, it means you will reach the 80% of the travel. What is the difference on setting servo travel then?? You will reach that 80-85% in a slower or smother way than just adjusting travel to 80%, hence, greatly reducing the sensitivity. In other hand, Exponential does not affect overall travel, but does on sensitivity away from middle point of the steak. Positive values make more relaxed the strength commanded on moving the steak. Test values above 10 for yourself. 
Comment by Peter Klimon on March 6, 2013 at 10:12pm

Gustavo - Manfred:

Thanks for your input. I will try your suggestions and post my results.

Manfred - The configuration file you posted is that for more than one model or a single model? Also is this for Heli or Airplane?

Comment by Peter Klimon on March 6, 2013 at 10:18pm

Manfred - can you clarify this, should I set the switch positions to match this example or were you referring to the Flap settings only? If so it would be most helpful if I could see an an example showing exactly what each of these settings should be.

Go to switch select and set it up like this: (don’t worry about my AUX3, AUX1 and Gear)


Comment by Peter Klimon on March 6, 2013 at 10:38pm

Can someone please clarify whether I should use Airplane or Heli for my DX8 and Hexa-B hexacopter from 3DR? There seems to be differing opinions on this and it would be most helpful why someone would choose one or the other? My research seems to find that the majority of comments I have seen indicate that I should use Airplane. 

Unfortunately this decision plays an important part as to which of the suggestions I should use for setting up the 6 position toggle switch for the various flight mode selections. I am having a difficult time getting my DX8 to work using the current examples because the information seems to be spread across several responses on this subject. It would be immensely helpful if someone could possibly take the time and post a brief step by step guide that starts by noting whether the settings are for Airplane or Heli and then guide the user to the relevant screens. Please keep in mind that new users like myself do not fully grasp how the Mixing settings will affect how the toggle switches behave so if any step is omitted from your instructions it would not be noticed by someone like myself. 

Again I would like to thank those of you that have contributed to this discussion! Please bear with us who are new to the various ways that a DX8 can be configured. Eventually we will grasp how the various pieces fit together...

Comment by Peter Klimon on March 7, 2013 at 11:48pm

How do I go about changing the PW readings if these settings do not work? I think I understand I need to change the percentages for the rates? Is this correct? If not please clarify so I can get a better handle on how these adjustments need to be made? 

BTW - It seems that neither of these suggestions worked for my DX8 settings? I must be missing something here but I just cannot figure out what...

Comment by Peter Klimon on March 8, 2013 at 12:00am

Manfred, are these settings affected by which channels are assigned to Gear, AUX 1, AUX 2 and AUX3 on the receiver? I know I have followed these suggestions but I still can only get 3 positions working? Obviously I must be missing something? Is it possible I need to tweak the percentages in the mixes? 

Comment by Manfred Dickgiesser on March 8, 2013 at 11:22pm

Hi Peter


It’s actually dead easy, just be concerned about the AUX you like to have the flight modes assigned to, so let’s call it AUXx.


If you have your RC flight mode at AUXx and use the Gear and the F Mode switch to select your Flight Modes ,

do the following:


1.   Go to “Switch Select” and link the Gear switch to AUXx

      Have F Mode Inhibited.

2.   Then go to Servo setup and set AUXx to 85% , 80% travel. (With this you can can then fine trim to fit the PW)

      !!! Check with the RC Monitor if AUXx is going from -85 to 80 when toggling the

      Gear switch. If yes, Good!


3.   Then go to Mixing Mix2.

  1. Mix AUXx to AUXx
  2. Rate both -40%
  3. Offset 0%
  4. Sw FM1


4.  Then go to Mixing Mix3.

  1. AUXx to AUXx
  2. Rate both -80%
  3. Offset 0%
  4. Sw FM2

Check again with the RC Monitor if AUXx is moving if you toggle the F Mode switch. It should move on the left  site from neutral if the Gear switch is down and on the right, if the Gear switch is up. If yes, Good, it should work.


!!!  At Servo setup AUXx Travel you can then fine trim to fit the required PW readings for each of the 6 APM Flight    Modes.


You will get 6 Flight Modes. If your Gear switch is 0 then you will get the first 3 when switching F Mode switch from 0 to 1 to 2, and if the Gear switch is 1 then you will get the second 3 when switching F Mode switch from 0 to 1 to 2.


Regarding your question: should I use Airplane or Heli for my DX8. 

It doesn’t matter, use Heli, then you will be fine.

An explanation why I use Airplane, you will find in this link on the end.

Comment by Manfred Dickgiesser on March 8, 2013 at 11:29pm


!!!! And don’t forget to calibrate the APM channel 5 for the max and min PW !!!!

Comment by Peter Klimon on March 11, 2013 at 2:41pm

Manfred - Thank you so much for the additional info. I am looking forward to trying out the new instructions this weekend...

RE: !!!! And don’t forget to calibrate the APM channel 5 for the max and min PW !!!!

Apologies for asking but how is this done? Can you point me to additional info on how this is done?  

I cannot express my thanks enough that all of you have taken the time to clarify things that must seem so obvious when you already know the proper procedures. 


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