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

[Konrad]

Not sure why you are having problems with the second RX. I use 2 RX a lot in my heavier programs. Mainly as a RX channel expansion scheme (what I think you want) or as redundancy set ups. I've followed the processes described in these manuals.

https://alofthobbies.com/collections/miscellaneous/products/taranis-plus-opentx-user-manual.

Have you tried one RX to deal with the airframe channels 1-8 and the second RX to deal with channels 9-16 for the dolly? Map your TX so that the dolly controls, motor and maybe stearing, are assigned to any channel in the higher numbers 9-16.

 

[Wayne]

I think this is the link he wanted to paste:

Taranis Plus-OpenTX User Manual

Comprehensive and concise, rich with graphics and diagrams the Taranis Plus User Manual is exactly what so many of us have been waiting for. While there is a plethora of information available online for thThe manual starts you with the basic features and

alofthobbies.com

 

[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.

Konrad, it's been awhile since this post, but I wanted to bring you up to date and ask an additional question. I got my Schweizer 2-32 up in the air using the motorized dolly discussed previously. The model rose from the dolly and when it pulled away, the dolly motor cable came off as planned, the dolly rolled to a stop, and I had a successful flight. But here's the deal: It turns out that the cable connector wire ripped out of its housing, i.e. it didn't neatly pull apart. I didn't use a 3mm coaxial connector, but instead filed a standard servo wire connector down to where it almost falls out of the housing (well not quite - but very loose). In the back of the plane I angled the housing so that it's pointed down and to the back of the dolly where the motor and cable originate. So it's not like it's making a right angle when it comes off or anything. I can't figure out why it doesn't just disconnect without ripping apart. My question for you is about your recommended 3.5mm coaxial connector. That looks like a TV cable connector to me, at least the one I saw when I googled it (attached). Do you think that would work more smoothly? I'll probably have difficulties figuring out how to wire it, too. I was wondering if a small audio jack might work better.
Any more thoughts on this? I was really pleased that the overall setup worked as well as it did. Thanks for the idea (I know, you strongly recommended against it)!

 

[Konrad]

Glad the crazy idea worked, sorta.

I suspect the force vectors aren't as you think. Can we get a photo of the failed connector and how they sit at the fuse line. Also is it possible to see how the system looks just before the take off roll.

P.S.
Back here on the 50 yard line I bet the dolly is outrunning the glider. That is the dolly is loosing the weight and drag of the glider. And the glider is seeing a lot more drag as the nose starts to point upwards. So I think the connector might need to be pointed to the front to line up with the forces at separation.

 

[Minimoa-2]

Hi Konrad,
Unfortunately I got rid of the failed connector (I shouldn't have!). Anyway, here's a photo of where I glued the female servo adapter into the bottom of the fuselage. It's behind the wheel, pointing back at a 45 degree angle.
But honestly, my plan now is to give up on this (you weren't a fan in the first place) and try again to figure out why I was never able to bind a second receiver. One thing I didn't think about before is that this really ISN'T a second receiver - it's a THIRD receiver. I had originally installed a second receiver as a redundant Rx via SBUS. But I don't know if that counts - after all, I didn't have to bind it to my Tx. It glows blue and appears to be working, but there's no indication of it as a second receiver in my setup screen. I assumed that's because it's SBUS'd.
Tonight I pulled a GR6 receiver out of a rarely flown model, and deleted it from its binding onto that model. But I still can't seem to bind it to my Schweizer 2-32 which uses G-RX8 receivers for the main receiver as well as the redundant receiver. All of the receivers are operating in ACCESS protocol. I think I did my setup exactly as shown on several different Youtube videos.
Hey man, thanks for all the help you've given me on this. I'll check around the clubhouse to see if anyone else has had this problem.

 

[Konrad]

If that is the rear of the wheel then I think the connector is biased the wrong way. I also don’t like that antenna being so close to the ground and wheel. These little whiskers are rather delicate.

As to multiple RX’s I have to say this is above my pay grade. But when dealing with RF issues I try not to assume anything. I look for confirmation of what I think is happening. I also look for tests that validate what may be going on.

 

[Minimoa-2]

Hey Konrad, after doing additional online research, and about 4 hours of trial and error in my garage (it's getting hot in Houston, by the way), I was finally able to get a third rx hooked up and working (main, redundant, and this new one for the dolly). I know you were in favor of this approach, and it's certainly the better and neater solution. I had made a bunch of rookie mistakes like forgetting to expand the number of channels and other things I'm too embarrassed to note here.

Another advantage of this setup is that I can taxi the dolly off the field after the Schweizer 2-32 has taken off, whereas before the dolly goes dead as soon as the umbilical disconnects.

I haven't tried it out at the field yet, but will let you know how it goes.

Konrad, THANKS SO MUCH for your excellent guidance and advice!

Sincerely,
Mark

 

[Konrad]

Mark, I will tell you that every time I do a deep dive into any program I find something that I can improve. Going back to some of my earlier OpenTX programs and I wonder what was I thinking. I’m often shocked that they worked at all.

So there is nothing to be embarrassed about. Here on Aloft’s forum I often air my dirty laundry in hopes that it will help others in their progression through the hobby.

All the best,

 

[Minimoa-2]

Thanks for the kind words, Konrad -