Help With new (first) TX/RX purchase (budget)
Replies to This Discussion
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Permalink Reply by Dave on -
I didn't say it holds the rest. Channels 1, 2, 3, 6, 7 & 8 having nothing coming out - zilch.
So, it holds the Rudder and whatever Ch 5 might be on the particular aircraft / copter / APM and then for everything else, it depends how your servo / ESC / APM interprets nothing ...
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Permalink Reply by Jake Stew on -
Seems like a reasonable system to me. It holds the rudder and flaps since hopefully you were already trying to turn back into range and you can't just change the flaps or you'll upset the trim. By dropping the signal the servos should just stay where they are and your ESC should turn off completely.
Lot's of opinions on what failsafes should be, but I don't think that the 9X method is particularly bad one, at least for a fixed wing. What would you have the receiver do?
In any case, the APM should be easily recognizing dropped signals and operating IT'S failsafe however you have it set. So I don't really see much need for setting the receiver failsafe as the APM has a million more features you can have set to do something useful when the signal fails. RTB or a large circle would certainly be pretty effective. If you've got a telemetry radio it should also be easy enough to take control via the MP.
I don't think any simple receiver failsafe settings could hold a candle to what even the most basic properly operating APM failsafe could do. That's why I'm not overly concerned what the receiver decides to do, unless it's something extremely stupid or unrecognizable by the APM. I don't think that's the case with the 9X and I'm pretty surprised that the cheapest and most popular 8-9ch system on the market isn't more well supported by the APM code.
What is the behavior of other receivers on signal loss and how does the APM respond? Are people using a whole channel with a certain failsafe setting just to activate an APM mode change?
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Permalink Reply by Brad Smith on -
I think people are looking at the code and forgetting about the autopilot you would want all you outputs at 1500 so they don't override the APM. the throttle setting below 1000 turns on the fail safe and the APM controls the throttle too what ever you set it. if you set your fail safe on your ail or elevator channels they will override the APM. please go back and read the instructions and do a ground test
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Permalink Reply by Brad Smith on
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i just checked mine with the stock turnigy and with the failsafe on the tx set to switch on RTL. fail safe it goes to circle for about 20 seconds and then switches to RTL throttle wont work on the ground and while its not moving all other channels are left on normal except throttle is on 80% my modes are set up on the three pos switch and the throttle cut off switch my modes are throttle cut off back ,3pos switch position 1 manual 2 stabilize and 3 loiter throttle cut off up 1 RTL 2 FBW 3 AUTO so to set fail safe on TX i just switched to RTL and set FS to the 2 switch channels i,m using and set throttle to 80% i have not tested this in the air but cant see why it wouldn't work . i only did this because i couldn't understand the instructions and the software was changing so rapidly its probably better now just to do as instructed and ground test these guys have done a great job and have thought this out way more than me but i thought i would give another alternative for those who may have special needs
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Permalink Reply by Brad Smith on
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this could easily be programed to auto so you could have a planned route back to home in case you needed to dodge obstacles or fly between mountains or dodge airports and such
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Permalink Reply by Brad Smith on
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i see 1 problem you have ail and elev fail safe set they should be normal only set fail safe on the throttle and whatever channels you use to switch modes if your trying to do it like mine if your trying to do it like the instructions you,ll want to have them all set to normal except throttle FS will be set to below 860 i believe and then adjust the throttle so it doesn't go below 1000 so you don't trigger fail safe when you throttle down. you need to look and see what the APM's showing in the tx set up tab to tell what is going on with your tx it seems like your dispay is showing mode 1 stick set up but the main thing to remember is even in RTL your tx will still override the APM so in a FS situation you center stick output on all channels except throttle and the switch channel that sets your RTL if your doing it my way if your following my way if your following their instruction then only the throttle should be set to below 860 all other should be normal or center stick so the APM can do its job and don,t forget to ground test turn off your radio and look at Mission planner to see what happens beware of the props
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Permalink Reply by Brad Smith on
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i just noticed yours is a quad so the throttle setting could be tricky not to drop out of the sky or fly up to the sun you might just want to stick with DIY's instructions if your module is the type to hold last position thats not going to be good you'll need to set fail safes too center stick except throttle, like i said they've thought about this more than me i,m on a plane so lot of differences
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Permalink Reply by Richard on -
On a quad I'd rather it fell from the sky than vanished into the clouds.
Decking it on the range is unlikely to harm anyone, while an uncontrolled crash once the batteries run out could be several miles away, and who knows what it lands on?
A controlled but rapid descent and landing is better, best is an RTL.
Throttle is utterly crucial to a quad, a freeze on that channel is clearly the most dangerous failure mode possible.
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Permalink Reply by Richard on
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My Spektrum park-fly RX ceases output all the channels except throttle, which it sets to the failsafe value recorded during bind.
I believe a lot of park-fly receivers do the same, while sport receivers tend to have more options.
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DistributorPermalink Reply by Dany Thivierge on -
Well guys I saw this thread a bit late but here is my comments on the Turnigy 9X thing.
oh before someone points it out again, yes I am a distributor and I sell these things so if you want to discard my comment fine with me... :)
The 9X is really entry level and you cannot fly far away without risking losing your expensive equipment (unless changing the TX/RX package) but even so I found that the screws will rust and stick will start to need adjustment now and then.
A lot of people are not interested in putting a lot of money on TX systems because brand names are very expensive ($499 and up)
When someone new starts exploring the world of multirotors there is many decision to make and quite often the radio is an "easy" one to do. Most that are on a budget and not thinking going pro level or carry expensive equipment will opt for the 9X (and associated family)
the FRSKY modules are really a great addition to get more reliability and you get telemetry (basic voltage built in)
But there was a need to an intermediate product and now we have it... We are using the WFlY09, a robust and well built radio (quality controlled and really way better once you compare the inside with the 9X)
combined with the FrSKY modules, this is very interesting for a nice price point. (with taxes and shipping it's around $400) In my mind, having tried the big guns Futaba, Spektrum, Hitec this combo is a killer for the price. You even get fancy side switches to control camera gimbals.
Again, yes I sell these but believe me when I say that I've put months into sourcing the best for the price Radio.
Check it out here: http://www.canadadrones.com/WFT09-Radio-Control-System-p/wft090-rad...
People around Mississauga you are welcome to drop by and give it a try... I know it's hard to buy these with only seeing pictures...
So in the end... should you buy a 9X ? If you put in the FrSKY and keep inspecting the switches and sticks YES! it will be a great combo. Plus you can flash the firmware and install backlight and more.
Or you can get this pro grade WFLY09 with FrSKY modules and not have to open it up to solder things!
And if you truly have money you go Hitec Aurora but be prepared to spend more for almost the same thing.
Hope it helps!
Dany
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3D RoboticsPermalink Reply by Chris Anderson on -
I watched the first video and don't see a "bug". Failsafe works as expected. You then disconnect the throttle channel entirely and expect APM to autodetect that (despite the other channels still being connected and working) and somehow go into another failsafe mode. That may or may not be a good thing to do, but it's not the way the APM software was designed and there's nothing in the documentation that would suggest that it would do that.
If that's what you want and enough people agree, it's a perfectly reasonable feature enhancement to suggest. But there's a big difference between feature requests and bug reports.
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3D RoboticsPermalink Reply by Chris Anderson on -
Maybe your idea is a good one, but as far as I know you're the first person in ~10,000 users to ask for it. There are an infinite number of "safety enhancements" that could be added to APM, anticipating any number of things that could possibly go wrong. You've come up with yet another -- one of the RC channel connectors comes loose.
Perhaps that is a high enough likelihood to deserve being considered by the dev team; I don't have a good way to calculate that. I also don't know what the best action in that case would be. (I could make just as good a case for holding throttle where it is so the craft can be brought home, as it currently does.)
At any rate, if this is a high priority for you, I suggest you work with the PPM encoder team to consider implementing it. But as I say, it just hasn't come up before.
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