I'm definitely leaning towards local interference, but that's mostly my gut feeling talking. Would love to drag my SDR out there and monitor the various frequency bands for weird stuff to see if I'm right.

I remember when blheli32 version 32.9 came out and Bardwell got excited for it and high PWM frequencies as well as variable PWM. All I can recall is people having issues with it as well as high PWM (may have been 128k) so they were going back to defaults. Could have been placebo effect but I think it was also on that same Tmotor ESC I downgraded it to 32.8 and the slight oscillation issue I was having went away.

Only other time I've heard of PWM frequency fixing something is when using the o3 to set it at 48k, not 24k because that's what the o3 camera gyro runs at and it causes oscillations.

(24-Jul-2023, 02:21 PM)Suros Wrote: I'm definitely leaning towards local interference, but that's mostly my gut feeling talking. Would love to drag my SDR out there and monitor the various frequency bands for weird stuff to see if I'm right.

(24-Jul-2023, 03:05 PM)sevro Wrote: I remember when blheli32 version 32.9 came out and Bardwell got excited for it and high PWM frequencies as well as variable PWM. All I can recall is people having issues with it as well as high PWM (may have been 128k) so they were going back to defaults. Could have been placebo effect but I think it was also on that same Tmotor ESC I downgraded it to 32.8 and the slight oscillation issue I was having went away.

Only other time I've heard of PWM frequency fixing something is when using the o3 to set it at 48k, not 24k because that's what the o3 camera gyro runs at and it causes oscillations.

Thank you guys, thanks to both of you for your input. I have another finding and I believe this might be what's killing my flight sessions actually. Something weird is going on with my Tango II (latest edition with black bigger screen).

Even while on the bench, when I turn it on, it starts popping up that USB prompt screen where it asks you if you want to charge the controller, USB storage, etc... but no USB cable is connected. And it does that randomly.

The first thing I've tried before replacing the SD card with new one, was to update the firmware. I remember not long ago, there was a post here in TBS Facebook group with exactly the same problem. USB prompt would pop up constantly even though USB cable is not even connected. Not sure if and how it was solved, but I can't find it for the love of God. I've had two crashes in last week only because of this... link gets screwed up instantly and my BlackBox shows super erratic sticks movement, like really jagged animation when that happens, and I am not even touching the sticks at that point. How I know this same USB prompt popped up on my screen while I was flying - I' ve heard that same sound like now when that USB prompt is popping up on Tango's screen. I also watched my sticks cam afterwards, and I saw that USB prompt jumping up on me couple of times just seconds before the crash.

Here is the video I just uploaded, so you can see what my Tango 2 is doing:

Glad you're making progress towards a solution! There is nothing more annoying than a sneaky intermittent problem.

(24-Jul-2023, 11:32 PM)Suros Wrote: Glad you're making progress towards a solution! There is nothing more annoying than a sneaky intermittent problem.

Yes, you are 100% correct here my friend. Let me know if this makes any sense please. Of course, don't waste your precious time, I can wait, it's not a problem. Rushing through these things was never a good idea anyway 

I just found out that my Tango II's Bootloader (neither one), was ever updated. It said that current version was v0.00. I've updated my receivers and TX to 6.19 couple of months ago, but I don't remember if I ever touched Bootloaders. Could this be a reason good enough for my Tango 2 acting that weird? I know, only time will tell, and I will keep monitoring it to see if those pop up screens (USB prompt) will ever appear again, but I am just genuinely interested to learn if this could be a culprit for my trouble?

Thank you so much once again!

I've never owned anything but a Radiomaster TX12 and Zorro. From what you've described though, I'd suspect some hardware shenanigans from the USB port. Even untested firmware shouldn't cause it to intermittently bring up USB mode prompts. It's almost sounding like the time I cleared purse grit out of a phone's USB port when it's owner described similar behavior.

I have to agree with Suros on this likely being a hardware problem... and I would be fairly confident that this is the cause of your problems (you saw weird rc command logs... that's all you need to prove a bad tx/rx setup). There could be some gunk in the port or inside on a PCB that is causing an intermittent problem. If you're comfy doing so, it may be worthwhile to open the tx up and hit the PCB's and connectors with some quick dry electric cleaner spray. If not, at least you found the culprit and won't have to spend countless more hours troubleshooting stuff... making me want to keep a stick cam running too lol.

(25-Jul-2023, 12:33 AM)Suros Wrote: I've never owned anything but a Radiomaster TX12 and Zorro. From what you've described though, I'd suspect some hardware shenanigans from the USB port. Even untested firmware shouldn't cause it to intermittently bring up USB mode prompts. It's almost sounding like the time I cleared purse grit out of a phone's USB port when it's owner described similar behavior.

Yes, I've heard that more than I can count fingers on my both hands. The thing with my Tango... I really never kept it in my pocket, lol. Joke aside, yes, something weird was going on. But, I've heard bad or corrupt bootloader will cause the whole thing to act crazy or not work at all.

(25-Jul-2023, 12:40 AM)truglodite Wrote: I have to agree with Suros on this likely being a hardware problem... and I would be fairly confident that this is the cause of your problems (you saw weird rc command logs... that's all you need to prove a bad tx/rx setup). There could be some gunk in the port or inside on a PCB that is causing an intermittent problem. If you're comfy doing so, it may be worthwhile to open the tx up and hit the PCB's and connectors with some quick dry electric cleaner spray. If not, at least you found the culprit and won't have to spend countless more hours troubleshooting stuff... making me want to keep a stick cam running too lol.

Yes, I'm pretty confident when it comes to that. I have a fairly long (I wanted it to be thorough) video showing me opening Tango, and doing completely custom paint job with Nostalgia case. Way different than what most of the people do using spraycans... this was paint brushes and incredibly effective Glow-in-the-dark paint. Not connected to this subject I started this thread for, but nonetheless kind of interesting one, for all those who like to play with these things 



So, I basically just mentioned it to show you I have no problems opening stuff (make couple of my own custom 5" quads, all documented on my channel as well), and I really enjoy doing those things.

Back to subject for a moment... is there anyone in these forums who could take a look at my BB logs and pinpoint what happened. I have two crashes with BB logs and videos, one is even showing 3rd person view, my quad from the camera behind it. After one flip, I started losing control over it, I was able just to control the throttle somewhat... but then it was obvious two motors (on the right side, front and rear), simply turned off and quad dropped from the sky. Damage was two broken arms, but I have tons of spares at home and I've replaced it immediately after I arrived home from my testing ground. All good, like new, flying super fine again.

I am really interested to learn what is going on and why I've had two-three of these crashes. I even followed Mark's advice (UAVtech) regarding the desync and trying to prevent it, so my Motor timing is set to Auto right now, Rampup Power to 25% instead of 50% originally, and Demag Compensation is set to High now. But I still had that last crash from yesterday (uploading nice video to YT as we speak).

I'd really love if someone could have a deeper look into what was causing this. Replacing arms is a piece of cake, but it gets fairly boring after some time 

As promised, this is the footage of that last crash when my Tango 2 was popping up with those USB prompts even though USB cable was not connected (obviously while flying). I've noticed there is quite a number of pilots reported the same or very similar thing in TBS Facebook group, so it's not an isolated problem. I have not noticed my Tango 2 doing this since I've updated both bootloaders earlier today. I will keep monitoring it, but I'd still love if someone could help with BB logs.