Hi everyone,

Iam still experiencing problems with correct setup of two Graupner MX-20, one for pilot (setup complete, MK is allready flying like a charm), but I couldn`t to get to work the second TX for camera.

MX-20 for camera man should control nick, roll (MK HiSight SLR1), camera shutter and roll of the MK (think with Teachable CareFree is this easily possible).

I have allready tried setup by wiki page for trainer mode, but with no success. Tried setup by user manual for mx-20 with the same result, tried both wired and wireless conection between trainer/pupil (wireless connection should be possible between two mx-20).

First problem is that after correct binding between teacher and pupil, connection to MK from trainer TX is lost.

Any idea, how to get this work together?

Both MX-20 with fw 1.120, Graupner HOTT gr-16 receiver (newest fw too), FC 2.1, NC 2.0, MKGPS 2.1.

Thank you!

The basic setup is not really a big deal, just read the wiki how to do it in the right order and then it works.
Only make sure to bind in the right order and be aware the telemetry will be with the cam operator.
We used the wireless connection and it worked fine after we got the binding correct.

Thank you for fast-reply. Finaly I have just now get to work everything, but only over D.S.C cable. (helped to change dsc output to PPM24).

When I try to connect wirelessly, tranier TX disconnects from the MK. I think I have to read user manual of the MX-20 again...

Hello hexacop,

still can't reach the wireless connection between two MX-20. Connection with cable works, but we have occasionaly a warning signal (pupil signal lost).

Please could you help me with correct order of connectiong?
Pilot MX-20 is paired with receiver in Mikrocopter. I turn on TX, radio -> on. MX-20 is correctly connected to the oktokopter.
Camera MX-20: turn on TX, radio -> off. Menu -> Teach/pupil -> bind
Pilot MX-20: Menu -> Teach/pupil -> bind. Connection is established immediately, but at the very same time the connection to oktokopter is lost.

I have tried many orders but without success. Thank you!

Hi George,
check if the okto receiver setting is still set to Sumo
and check for proper channel assignment of the okto receiver.
Other than that I have no idea what else could be wrong...

Hi hexacop,

thank you for superfast reply.

I've got to our MK just now, hoped that Sumo isn't set correctly but no, it is OK.

Is there anything what should be done with pupil MX-20? Instead of binding to teacher? Thank you!

OMG, I have got it after reading manual again. There has to be binded PUPILS transmitter with mikrokopter, not TEACHERS. It didn't make me sense at all...
Now everything works the same as over the cable.

BUT! As I understand, from now, every time we flight, we have to flight WITH BOTH transmitters ON. If I want to fly just myself (with teacher transmitter), I have to take off cap of MK and rebind receiver with teacher transmitter. Am I correct?

George meinte

.... Connection with cable works, but we have occasionaly a warning signal (pupil signal lost).....

I am also trying to use the teacher-pupil via DSC cable to manage the tilt and zoom (Lanc), it works, but i have also the cut in the signal and the warning ???

any ideas ?
Thanks
Denis

We have used a stereo cable, in manual there is to use mono. We didn't try this one, wireless connection is without cuts...

With the wireless connection you lose telemetry ...

I use the mono jack sold with a "Graupner" label ...
regards

George meinte

We have used a stereo cable, in manual there is to use mono. We didn't try this one, wireless connection is without cuts...

did you maybe not set the "DSC output" to 24? If this is still "10" you can only use the first 5 cahnnels.

http://mikrokopter.de/ucwiki/en/MX-20#Setting_for_a_flight_simulator_or_trainer_mode

Hello Lothar

thanks for the reply, both transmitter are at 24 and all channels i send to the pupil mx20 work

i send 8-9-10-11 for tilt - photo shutter - camera zoom - cam"on-off" (Lanc)
everything works on both radio but when sent to the pupil there are cuts, and the problem of the cuts is that the zoom jitters and the camera stops ...

if you want to see/ear the problem, small video here.

https://dl.dropbox.com/u/6504075/cut%20ecolage%20mx20.mov.zip

i rechecked the manual again today, no way ...

regards
Denis

hi nosig78, yep, we had the same problem. Maybe mono cable will really help. BUT we do NOT loose telemetry with wireless connection...

Hello George

I can't beleive it ! ...

I haven't tried yet wireless because the manual says telemetry data will not work !
(page 204 english version, page 200 french version)

"Furthermore, you should remember that the return channel assigned for wireless trainer mode functionality is normally used for telemetry connections: accordingly, it will not be possible to transmit any model telemetry data..."

Edit: Graupner support France told me that the telemetry was still working between model and master radio even using the HF trainer mode.


regards
Denis
PS: i have the Graupner mono cable ...

George meinte

hi nosig78, yep, we had the same problem. Maybe mono cable will really help. BUT we do NOT loose telemetry with wireless connection...

Hello
George you were right
HF trainer mode works and telemetry is ok between master and model.
(I just don't understand why they choose to bind the pupil to the model?...)

Regards
Denis

Same here, really don't understand why it's binding with pupil.

Maybe we really need cable with Graupner logo on it

And I can answer to my questions some post above myself:
Yes, you can fly with MK just with Teacher MX-20, when Pupil's is OFF (!) But teacher's MX-20 is beeping all time...

I have "the supposed to be Graupner mono cable at 29 euros" ;-)

BTW I discovered a problem with HF trainer mode, it seems you lose some of the automatic voice messages for gps-carefree-altitude ++
On the screen display is ok but feedback seems slower.
Manual voice messages for telemetry still work when using a switch.

By the way do you use the Lanc system ?
What commands do you use for camera control ?
(On the second mx20(pupil) i tried gaz stick for tilt and an analog poti for zoom, i don't find that easy to use.)

Regards
Denis

George meinte

Maybe we really need cable with Graupner logo on it
And I can answer to my questions some post above myself:
Yes, you can fly with MK just with Teacher MX-20, when Pupil's is OFF (!) But teacher's MX-20 is beeping all time...

Denis,

we don't use LANC, just simple IrDA remote controller and in fact, we don't use zoom either. Because of use safety motor switch, care-free, gps, altitude hold, two way camera control, we don't have spare channel to control zoom. We can control CX730/Nex-5N shutter, but we have to re/install profile every time we switch between them...