Two of my customers have trouble setting up the Pixhawk - I myself have a Pixhawk, but don't use a Futaba receiver, thereby I can't replicate the problem (I would like to find out if the problem is connected to the receiver they use, or something else).

Both use a Futaba R7008SB receiver.
Both managed to upload the Firmware to their Pixhawks - but they are not able to do the radio calibration (the Pixhawk doesn't "see" the receivers, the bars in the calibration are all grey).

They have nothing else connected to the Pixhawk, except receiver (connected to the right port / RC), buzzer, safety switch and USB cable.

The Pixhawk signals via the big LED "pre-arm check failed" (which makes sense ;)

They power the Pixhawk via USB and at the same time with a LiPo (via the Power Module).

The receiver is "found" by the remote, the LEDs are on, the setting of receiver and remote (regarding the use of the SBUS) seems to be right. They use the right port of the receiver to connect to the Pixhawk.

I am happy about any suggestions ...

Thanks a lot in advance


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Wish I knew. What I understood from the documentation is that if you go to the screen where you can set it up and flip switches on the transmitter then the correct row will highlight and you can choose

Either my transmitter isn't sending anything though the channels or the Pixhawk isn't picking up anything or maybe it just doesn't work and the documentation is wrong

Going to remove the Pixhawk from the equation tomorrow and see if the switches move a servo connected to the receiver. If this doesn't work at least I know the transmitter isn't set up to send anything yet and I need to figure out how to do that. Been reading the Futaba book, but couldn't get a picture to translate the names they give s1, j1 and so on to the switches and dials on the transmitter.

Futaba 14SG   6 mode switch

Link -> Sub-Trim     5GEAR       -151

Link -> Reverse      3THR          REV

Link-> Failsave       3THR          F/S     OFF  -130%

Link->Endpoing      5GEAR        135   62  62 135

Model-> Progmaix  1 OFF:GEAR->GEAR

#1                       +0

 OFF                    +0

  GEAR               OFFS

    GEAR       x          +0

  LINEAR       y          -50

#1 ACT OFF                SA

                                     LINK TRIM


SLAVE           GEAR     OFF

Thank you

I am looking up the settings in the manual and I have a couple questions

Where can I find which channel is linked to which switch on the transmitter?

Does the number next to the text, e.g. 5GEAR mean that is linked to channel 5?  Which switch is linked to channel 5?  I found on page 13 the naming of each switch so I guess I want to know where is the link between switch and channel.  I don't know what to search for on Google and don't know what to look for in the manual

Link -> Sub-Trim     5GEAR       -151

This is to set the neutral position of the servo.  Why do we set GEAR to this number?

Link -> Reverse      3THR          REV

I understand why we need to reverse the thottle, because when the throttle is in the low position on the transmitter it is max on the Pixhawk

Link-> Failsave       3THR          F/S     OFF  -130%

Mine defaults to -100%.  I have to hold in RTN to change it and it only goes to -100%.  Seems this will cut the throttle when the radio signal is lost.  Will the Pixhawk handle this or will the copter just fall out of the sky?

Link->Endpoing      5GEAR        135   62  62 135

I don't understand this one.  So when you press the button that links to Gear the servo isn't going to move at all because its travel is from 65 to 65, but its limit points are 135% and 135%.

Model-> Progmaix  1 OFF:GEAR->GEAR

This has to do with mixing a channel with another channel.  Looking at the manual it seems when you use one switch or lever then another will also be used at the same time.  So combining two tasks in one

I was trying to enter it this morning.  I couldn't find GEAR on this one.  I think it is probably because I am in helicopter mode?  What would this setting do?  Mix gear with gear?

Sorry I forgot main switch:    Link-> Function     5 GEAR  SE  -

Channel 5 use to control flight mode. The main switch is SE (or what do you want) and sub switch SA.

Because SE has only 3 positions need to add a subswitch to use 6 positions.

Failsafe: THR down and full trim down = -130% 

This mean radio connection lost and Pixhawk detect it and switch to RTL/LAND mode.

By default when radio connection lost  all channels hold last position. But this -130 means throtte switch down to Failsafe position, below 975. (975 set in Mission Planner Failsafe settings)

I'm new and still planning/reading what I can in regards to my first quad build.  Since I was contemplating a Pixhawk/Futaba combination, I studied this forum discussion.  On one hand, it demonstrates there is more I need to learn(and to RTFM for minor details).  On the other hand, I was pleased to see the community collaborate over the course of 5 months and the persistence of Xian06 in the end.  It was also nice to see him sharing what he's learned.  It would be nice to see a start to finish build of an F450 Flamewheel (the ARF kit with Pixhawk) in detail.  The F330 build in the wiki is a bit dated now and assumes a fair amount of knowledge by the reader.  Thank you

Sorry to say but my nightmare continues.... My machine is completely unstable, it won't fly at all- even in stabilise mode. I have triple checked everything and followed all the troubleshooting guides. I am getting messages saying unable to decode message 152, 162 and 2 on apm planner. For some reason my mac will not let me connect to the cli, I just get scrolling characters. I am at a loss, everything is calibrated and connected properly. I do have issues with the throttle, on occasions only one motor will turn and other times they react inappropriately Any ideas? My next step is to try ppm encoder and stable version to see if that helps. I can't use qcontrol as everytime I try to flash firmware it says binary corrupted!

Since I'm still planning and acquiring parts, I wouldn't be much help.  I don't think you meant to reply to me, but it appears that way in the thread.  I'm finding it really hard to locate a new Futaba 14SGH at this time.  Most sites are out of stock.

Tower Hobbies will be getting a big shipment in a couple of weeks. Just backorder one and yours will be one of the first to ship.




Hi troy, yes sorry mate- I didn't mean to reply to you directly. All I will say though is I would avoid the pixhawk and futaba s-bus combination with your life. This has caused me nothing but trouble and despair. I don't know of anyone who has this working (if anyone has then please feel free to confirm). I know both xian and myself have got the throttle responding in calibration but mine is unflyable for some reason and Xian has indicated that he is having the same issues. If I find a solution I will let you know but if you want a pixhawk, I really recommend a different tx
Best of luck mate

Hi Martin, I've seen a great number of posts in various forums regarding this issue.  For open source, autonomous flight, the APM/Pixhawk is the only thing out there.  There are many advantages to the Pixhawk in the long term.  Everything I've read on transmitters indicate that Futaba has a stellar reputation as transmitters.  With release candidate version(s) of the Pixhawk firmware showing signs of support, I'm optimistic that there will be a solution to this issue.  I've found numerous suggestions for getting it working besides what's here, but there's no way I can vouch for them myself.  I find conflicting information between the arducopter wiki and the pixhawk wiki as to the level of support.  The first says some are supported and the later says all are supported.  I don't particularly like the Spektrum route as it pertains to connecting to the Pixhawk (satellite) and the Spektrums don't have such a great reputation from what I'm reading.  I understand it has been a bear between the Tx and FC combo.  Xian replied to me that he wasn't continuing with the Pixhawk.  I won't speak further for him as to the reasons.  The 8FG Super is discontinued.  The 10CG is too limited.  The 14SG appears to be the best value for the money.  I'm glad I have an idea for what I'm getting myself into should I continue this route.  I don't have the Tx quite yet, so I appreciate the information.  Best regards

My local hobby shop doesn't carry Futabas, but said they could get it at the same time as Tower Hobbies and beat their price.  I won't know until tomorrow as to when they can assure me I could get one.  I'm all for supporting a local shop, but I don't know they will get them any sooner than Great Plains or Tower Hobbies.  I am already on the list at A Main, but they moved their ETA back.  Thank you for the heads up.

Here are my thoughts. I am an owner of a futaba 14sg and a pixhawk. When i bought the futaba , i found out that it doesn't work with pixhawk so instead of the 7008 receiver , i use a frsky receiver (about 20$) and everything was solved. frsky receivers  compatible with futaba work very very well and people have told me that they have greater range than futaba ones. The only problem was that i m not using fasttest protocol of course. In case someone wants to use the futaba receiver , why not buy the pwm encoder - decoder , send pwms from receiver to encoder and export the pwms into ppm from it ? I think this is also a cheap and good solution.I have bought this one http://www.ebay.co.uk/itm/281220144657?ssPageName=STRK:MEWNX:IT&... but haven't tried it yet. I m sure it will work fine though.

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