Can't bind two G-RX8 receivers to the same model on my Taranis Lite transmitter using ACCESS protocol

[Minimoa-2]

I've tried and tried. All the posts I've seen talk about using ACCST D16 protocol, which I don't want to do. When I try to register or bind, I get flashing green lights, followed by flashing red lights. ACCESS is set to channels 1 - 16.
Maybe you simply can't do it using ACCESS?
Thanks for any insights -

 

[Konrad]

Well, the G-RX8 was an ACCST protocol RX that can be upgraded to ACCeSS. Is your RX actually running on ACCeSS? These can be found at the FrSky here.

Like the old ACCST the new ACCeSS protocol require that both the TX and RX are on the same high level revision number. I strongly recommend upgrading both the TX and RX to ACCeSS V2.1.xx. Again the firmware can be found on FrSky's site here.

 

[Wayne]

You can stay on ACCST, but need to make sure both are on the same version. ACCST V1 will not talk to ACCST V2. The receivers we are selling should be on ACCST V2. Soon we will offer the G-RX8 with UNI-rx and then this will no longer be a problem. UNI-rx should be released for this receiver officially this week.

 

[Konrad]

I read that the OP want's to stay with ACCeSS. Not sure what he wants to do with binding two receivers on the same model? Maybe expand to use 16 channels or S-bus redundancy?

Doesn't ACCeSS have the same requirement as to need the FW Revision # to be of the same primary order, such as V2.xx.xx?

 

[Wayne]

Shoot, I missed the part about ACCESS. My bad.

 

[Minimoa-2]

You can stay on ACCST, but need to make sure both are on the same version. ACCST V1 will not talk to ACCST V2. The receivers we are selling should be on ACCST V2. Soon we will offer the G-RX8 with UNI-rx and then this will no longer be a problem. UNI-rx should be released for this receiver officially this week.

You can stay on ACCST, but need to make sure both are on the same version. ACCST V1 will not talk to ACCST V2. The receivers we are selling should be on ACCST V2. Soon we will offer the G-RX8 with UNI-rx and then this will no longer be a problem. UNI-rx should be released for this receiver officially this week.

Thanks for the reply. I took the second receiver off another model that was working fine with my TX, so I'm pretty sure that there is no version conflict involved.

 

[Minimoa-2]

I read that the OP want's to stay with ACCeSS. Not sure what he wants to do with binding two receivers on the same model? Maybe expand to use 16 channels or S-bus redundancy?

Doesn't ACCeSS have the same requirement as to need the FW Revision # to be of the same primary order, such as V2.xx.xx?

Konrad, what I'm wanting to do is this: I built one of my new gliders (a Tom Martin 1/6 scale Schweizer 2-32) with a motor in the nose. It's too heavy to build up enough speed to cleanly separate from the dolly and get airborne (my other gliders work great with this dolly). I've gotten it in the air using very scary hand launches (and I mean SCARY) and don't want to do that any more. I don't want to buy a larger motor and ESC if I can help it, so I was thinking that if I could just give it a little more ooomph on the takeoff roll it should be fine. In the air it handles fine and has does not seem underpowered. So I was hoping to mount one of my spare motors in the rear of the dolly with a pusher prop, ESC, battery, and this spare receiver. I was going to use the volume knob on my TX to communicate with the second receiver on the dolly controlling the throttle. So when I get ready to take off, I twist that volume knob up for power (and of course the motor glider is at full power too), then, when the dolly has enough speed and motor glider separates, I turn off the dolly power from the volume knob and enjoy the rest of the flight. Does this seem doable to you? Grandiose, I admit.

 

[HENNY]

You don,t need a second receiver to achieve this. Just program a second motor and you are done.

 

[Konrad]

Not having seen the performance of your setup, my first guess is that you need to work on the pitch to diameter ratio of the prop you are using. More diameter and less pitch for the same current draw. If you have head room with the motor add a heavier prop (more watts).

As to push from the dolly I don’t like the idea of a second prop. I like a bungy, but these can’t be controlled once you release. A motor driven axle might be a better powered solution.

And yes you will want a dual RX one to control the dolly and the second to control the aircraft. You could use a umbilical cord that pulls from the belly of the glider but that is less than ideal.

 

[jure]

Minimoa-2 , you could have a motorized , steerable dolly , operated by another radio. see in the video below how I did it.​

 

[Wayne]

So you don't have enough speed to get the plane off the dolly, but you were able to hand launch it?

Adding power to the dolly is one option.

Another option might be to bungie launch the model.

 

[Minimoa-2]

You don,t need a second receiver to achieve this. Just program a second motor and you are done.

Yes, I believe I do need a second receiver since the dolly motor is separate from the glider motor. With one receiver, both ESC wires would have to be connected to the glider's receiver. When the glider goes airborne it would rip the wire from the dolly ESC and probably result in a crash.
Maybe I'm wrong?

 

[Minimoa-2]

So you don't have enough speed to get the plane off the dolly, but you were able to hand launch it?

Adding power to the dolly is one option.

Another option might be to bungie launch the model.

Yes, I thought about motorizing the dolly's wheels instead of using a motor and prop mounted on the dolly. That seemed more involved. I want to stay away from using a bungie setup if I can. It requires a more involved setup and it ties up my club field, which is dominated by power flyers.
I was BARELY able to hand launch it - an experience I don't want to repeat.
Thanks, you gave some good suggestions - I may return to these if I can't figure out how to bind a second receiver to the model (that was what my original post was about).

 

[Minimoa-2]

Minimoa-2 , you could have a motorized , steerable dolly , operated by another radio. see in the video below how I did it.​

Jure, that is really cool! Actually, I thought about doing something like that, but here's the deal: I usually go to the field by myself early in the morning when no one else is there, because (1) winds are at their lowest then, and (2) I hate it when other people see me crash my planes : )
I wouldn't trust myself operating two controllers at once. I may come back to that if I can't ever figure out how to bind a second receiver to my model. It should be easy according to the videos...
What a great setup you have!

 

[jure]

thanks Minimoa-2 !
Correct, this concept requires teamwork.
Luckily I have the always supportive assistance of SailHigh who joins the fun, also in the glider towing efforts.
A good dolly is also helped by a nice runway , which we lost when our club lost the site.

 

[Minimoa-2]

Not having seen the performance of your setup, my first guess is that you need to work on the pitch to diameter ratio of the prop you are using. More diameter and less pitch for the same current draw. If you have head room with the motor add a heavier prop (more watts).

As to push from the dolly I don’t like the idea of a second prop. I like a bungy, but these can’t be controlled once you release. A motor driven axle might be a better powered solution.

And yes you will want a dual RX one to control the dolly and the second to control the aircraft. You could use a umbilical cord that pulls from the belly of the glider but that is less than ideal.

Konrad, thanks for the post. I have spent hours getting the best prop/motor/battery cells combination to maximize power with my setup. But, alas, even at maximum power it's just not enough to get it off the dolly. It tries!
Motor-driven axle is another possibility.
I'm intrigued by your "less than ideal" umbilical cord idea. I'm already in a "less than ideal" world right now. I'm having difficulty visualizing what you mean - can you offer a few more details?

 

[Konrad]

Might I suggest a post under gliders for ideas on power and power systems. I’m sure there are ideas there to launch heavy 3m ships.

Now I strongly recommend against this. But I was thinking of using a mini 3.5mm coaxial connector as the break away for an umbilical cord from the airframe to the dolly. This umbilical cord would carry the RX throttle signal to the Dolly ESC and power system. When the plane lifts off the umbilical connector would un-plug putting the dolly ESC in safety mode (signal loss) and shut down.

The correct solution in my mind is a properly spec’s power system or at least a dual RF system with the second being used on the dolly.

 

[Flying Dutchman]

A fiend of mine successfully made an EDF-powered dolly, controlled with a separate radio. That obviously necessitates a second pilot/driver for the dolly, unless you simply (without looking) switch off the EDF with that 2nd radio after launch, and let the dolly run off the side or end of the runway. But typically there was no lack of volunteer dolly drivers.
I believe his main reason for using an EDF (although generally less powerful than a prop) is that a potentially out-of-control dolly with an EDF will be less harmful than one with a spinning prop on it. And of course it looked and sounded pretty cool.

 

[Minimoa-2]

Might I suggest a post under gliders for ideas on power and power systems. I’m sure there are ideas there to launch heavy 3m ships.

Now I strongly recommend against this. But I was thinking of using a mini 3.5mm coaxial connector as the break away for an umbilical cord from the airframe to the dolly. This umbilical cord would carry the RX throttle signal to the Dolly ESC and power system. When the plane lifts off the umbilical connector would un-plug putting the dolly ESC in safety mode (signal loss) and shut down.

The correct solution in my mind is a properly spec’s power system or at least a dual RF system with the second being used on the dolly.

Whoa, Konrad - that is genius! I just tried it using channel 7 on my original receiver programmed to the volume control knob and it works great with the second (dolly) motor, while the main motorglider motor continues to work with the standard throttle joystick. I don’t see why a loosely attached 3.5mm connector wouldn’t work as a breakaway umbilical. I agree that a properly spec’d power system is the right way to go, but I have this spare motor and ESC and I don’t want to buy more expensive equipment if I don’t have to.
Do you have any more thoughts as to why I might be unable to link my spare receiver to this model? I agree that would be the more elegant solution.
Thanks!

 

[Minimoa-2]

A fiend of mine successfully made an EDF-powered dolly, controlled with a separate radio. That obviously necessitates a second pilot/driver for the dolly, unless you simply (without looking) switch off the EDF with that 2nd radio after launch, and let the dolly run off the side or end of the runway. But typically there was no lack of volunteer dolly drivers.
I believe his main reason for using an EDF (although generally less powerful than a prop) is that a potentially out-of-control dolly with an EDF will be less harmful than one with a spinning prop on it. And of course it looked and sounded pretty cool.

Thanks for that feedback, Dutchman!