9X glitch?

[privatepilot]

Hello,

New to the forums. I have a 9X that I've flashed with ER9X and also done an antenna mod to relocate the antenna to the module. Everything seems to be working well and a range check looks solid. I flew my Extra 300S today (.60 size with a 1.20 four stroke) and about once per flight, I was losing control of the plane. The lack of control seemed to last only a second or maybe two and seemed to be on vertical maneuvers. I thought I read somewhere about a known bug like this that had a fix, but for the life of me can't find it. I haven't confirmed that the problem exists on any of my other planes yet but I'm not excited about maybe losing an airplane.

Any ideas?

Thanks

[Kilrah]

The "fix" that most apply is to throw the stock module and receiver away and replace with something better like FrSky

Envoyé depuis mon S6 avec Tapatalk 4

[ShowMaster]

Kilrah may have the best answer.
The Turnigy/FlySky rf system isn't very robust but does work for many. Your location to RF from interfering 2.4g sources could be what's going on. To be fair, relocating the antenna also meant that you unsoldered the antenna coax and re soldered it. It's no longer a stock system! As for range being ok, it would seem it's not by your loss of control.
Buy a Frsky DJT module and some frsky receivers and enjoy solid control with failsafe for 2000+ feet and don't look back!
The replacement of a .60 plane and engine is more than the cost of the DJT module and a few new receivers.
A good solid radio system makes or breaks our fun factor and we seem to low end it's cost.

[jhsa]

get the module with telemetry and it will warn you that you are close to losing signal. I'm curious about how you did the range check on the original module and receiver....

[gohsthb]

How is your antenna installed in your plane? It's it away from everything it possibly can be? Also like jhsa I'm interested in your range check. There is no range check mode in the stock module so you would have to walk quite a distance.
-Gohst

[privatepilot]

Range check was done via a long walk. The airplane was further away from me than I normally fly and had good control. I found a thread that talked about issues with delay when any trim changes were made to the TX that in turn wrote to the EEPROM. I think all of my issues happend around the time I made a trim change as well but I'll confirm that. If this ends up being true, I don't think a new module and receivers are going to fix the issue. I do have an OrangeRX module for the radio for a small BNF airplane but haven't used it yet. Perhaps I'll convert to OrangeRX if the problem is not EEPROM related.

[jhsa]

I wouldn't fly a quite big glow plane with the orange module or with the stock module..

[jhsa]

oh, now that you mentioned the trim changes, please do a test.. This is important.
Check if when you move the horizontal trims really quickly, the radio reboots.. try several times as you wanted it to happen. Please report back.

João

[gohsthb]

Software wise I know the trims are solid and cause no noticable delay. At one point it did, but has since been fixed. Would more likely be the horizontal trim issue that Jhsa mentioned. The fix for that is covered in another thread on this forum. I still want to know about the antenna installation, that can be extremely important. also while you are flying make sure you can never "point" your antenna at the plane. In that orientation the Tx has the least range.
-Gohst

[privatepilot]

The antenna sticks straight out the back of the module now and can stick straight out the back of the module or straight up. I'll try the horizontal trim test. To be clear, are we talking about the rudder and aileron trims or the trim for the horizontal stab?

[gohsthb]

Yes, the Rudder and aileron trims. And I actually meant the antenna in the plane. How that is oriented. So I know we are talking about the same receiver. It is the kind with a red shrink wrapped end?
-Gohst

[privatepilot]

oh. The antenna in the plans sticks out the receiver towards the back of the airplane. Yes, it's the stock receiver with the red heatshrink on the end of the lead. The antenna is along the long axis of the airplane.

[MikeB]

The comment about the Tx antenna not pointing directly at the 'plane, also applies to the Rx antenna not pointing directly at the Tx. So if you are doing a vertical climb, the Rx antenna IS pointing downwards. If you change to FrSky then you get TWO Rx antennas so only one can point at the Tx.

Mike.

[privatepilot]

Understood. So FrSky with twin antennas, one goes back and the other across the fuse for example? Would it make sense to point the antenna straight out the back of the transmitter rather than at an up angle? I'm not against changing the module, but I don't want to spend the money if it's not the root cause of my issue.

[jhsa]

Trim Test??

[MikeB]

You could try a range test with both antennas pointing directly at each other. Again, FrSky has a 'range check' mode where the Tx power is reduced so you don't need to walk too far!

Mike.

[privatepilot]

Trim test will happen tonight jhsa, I'm at work right now.

I'll try the range check that way as well Mike.

[dvogonen]

I invested rather heavily in FlySky receivers until I ran into the exact same problems as described. I often lost control without warning at longer or shorter distances. There was no specific pattern. It just happened from time to time. Range testing worked just fine, then I would lose control and regain it instantly. Very spooky.

I switched to an OrangeRX module for the short range stuff and FrSky for everything I care about. Neither have ever failed or glitched. Not once.

[jhsa]

Trim test will happen tonight jhsa, I'm at work right now.

I'll try the range check that way as well Mike.

Sorry, sometimes I forget that there is a "other side of the world"

João

[privatepilot]

moving the horizontal trims in any combination did not cause any kind of reset on my transmitter. I got home too late to do the range check with the antennas pointing at each other.

[jhsa]

In case you didn't, you have to move the horizontal trims quickly and not by keeping the button pressed, but by pressing it many times as fast as you can

[privatepilot]

I moved them as quickly as I could, held them from one extent to the other, moved them back and forth you name it. No reboot or unusual characteristics.

[jhsa]

good, thanks. ok, so that might rule reboots out..

[gohsthb]

It is still possible that reboots occur with the m64 chip. Really they should occur the same as with other processors. Testing just shows that it doesn't happen, at least not as much. Still a good idea to do the mod anyway, then you know the possibility is gone.
-Gohst

[privatepilot]

I read through some of the thread yesterday but didn't feel that a definitive mod had been established. What is the proven working mod?

[gohsthb]

Put the 1k resistors on the trim switch board. Flaps30 explains it in a post on that thread.
-Gohst

[privatepilot]

ok thanks. I'll re-read it and look for that post.

[MikeB]

Gruvin's mod that replaces the analog ground with a digital ground is good. I still don't like the fact that all the switches short a charged 0.1uF capacitor to ground when they switch on. This causes a current spike. The 1K resistor mod prevents this spike.

Mike.