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HelicopterRadio - Spektrum DSM › DX7 anomole(Its the only one that has reversed​channels...TWICE!
09-14-2007 05:08 PM  10 years agoPost 41
artimus

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Buckley WA

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no its a 5 cell JR 18000mha stepped down to 5.8 at least it shows 5.8 on volt meter with no load.

Fly Hard......Team Viagra

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09-14-2007 05:11 PM  10 years agoPost 42
jester4

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Brampton, Ontario

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I think you should take the whole regulator thing out of the equation. Put a regular 4 cell RX pack and see. I don't want to tell you to try it in the air (because we know what happened there ), but is there some way to test this set-up on the ground without actually flying? Maybe play with the sticks for a while and see if it happens again at the same spot where all the previous incidents happened. Maybe someone has a better idea?

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09-14-2007 05:34 PM  10 years agoPost 43
artimus

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Buckley WA

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Thanks all for you sugestions......we are all​in this for the same reason.....fun

Thats what I thought I was doing last night ....at what point do you say OK lets try it again.....every time you lanuch a heli its a risk....its just controlled mayhem. all sugestions are welcome......yea your right about the regulator. will keep you posted on the ups and downs (wink wink)of this thing.....Thanks for your sugestions

Fly Hard......Team Viagra

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09-14-2007 06:47 PM  10 years agoPost 44
Mark C

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Houston, TX - USA

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but switch to 7.2 1800mha nicad pack steped down to 5.8v when I started to have issues
no its a 5 cell JR 18000mha stepped down to 5.8 at least it shows 5.8 on volt meter with no load.
Ok... There is your problem.

A 5 Cell nicad pack is not 7.2 volts. It it only rated to 6 volts. There is no reliable voltage regulator on the market that has only 0.2V forward dropout that can be used to regulate a 6 volt pack down to 5.8 volts.

You may connect that system on a voltmeter with no load and if your nicad pack has just enough floating no-load charge you may read 5.8 volts out of your regulator. The moment you apply a good load your nicad pack output is going to drop to around 6 volts and your regulator output goes into a grey area and can no longer be trusted.

KISS (Keep it simple) Stick a GOOD TRUSTED 4 cell pack WITHOUT a regulator and strap in in for a bench test.
The fix is to go back to a company that has a proven track record of reliability and customer service and not to trust an up start with unproven technology..... "Just my opinion I could be wrong"
I'm sorry buddy put this technology is tried and true. I have been flying on DX systems for a couple of years now. I have flown around HUNDREDS of other DX systems, cordless phones, linksys routers etc. etc. I fly every other day with at least one or 2 other gentlemen flying Spektrum radios at the same time. I fly every weekend alongside 5 to 10 other gentlemen flying Spektrum radios. I have flown at funflies with 60 to 100 Spektrum systems not kept in impound. There were hundreds of pilots at IRCHA using Spektrum system. In all I have almost 200 gallons (almost 2 gallons per week for 2 years) on these systems.

I am not saying you are not having a problem. I'm saying that accusing the technology to be the root fault is WAY off base here. If you do find that there is an issue with your Spektrum system it is a repairable issue that can be resolved. Hell I have had to send in 72mhz receivers for repair. Equipment can break and be faulty and it can be fixed. My point here is that you need to stop attacking the technology as your root cause.

My money says you have a power system issue. If your statements I have quoted you on above are accurate, I can GARUNTEE you have a power system issue.

Good Luck,
Mark C.

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09-14-2007 07:58 PM  10 years agoPost 45
cdrking

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Seattle

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artimus,

Sounds like you may be believing my PM. Interesting how you come to these conclusions on your own.

Jeff

To hover is divine, the alternative is rather PLANE.

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09-15-2007 12:27 AM  10 years agoPost 46
HHawk

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Gardnerville Nv.

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artimus, I feel you man, it sux to hear everyone tell you,"It cant be the Spectrum equiptment." How does everyone explain my T-Rex 450SE, with stock ESC? Stock Align 22C bat? and 430XL motor? It arrived at Horizon today at 12:09PM. I cant wait to post what they find with it. I am interested to hear what you find when running the 4.8v direct.

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09-17-2007 08:40 PM  10 years agoPost 47
HHawk

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Gardnerville Nv.

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After giveing this some serious thought, how would voltage affect a channels ability to hold memory? I've heard of gyro's resetting due to low voltage. I've also heard of voltage causing loss of control or lock-out.
But the heli has plenty of voltage, it binds, initializes, and range checks fine. The servo direction and swash setup is the same as the 600. I could pull the AR7000 out of the 600 and use it on the 450, Im just enjoying the 600 too much.

Paul- Do you have anything to do with Spectrum repairs? Or do you let Horizon handle it? It would sure be comforting knowing the inventor of the technology is directly involved with service.

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09-19-2007 12:51 AM  10 years agoPost 48
kenb

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cloquet, minnesota ​ carlton

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Yours isn't the only dx7 to reverse pitch and elevator. Mine did too, but only once so far. The pitch setting also changed from my house to the funfly. Horizon said they never heard of it nor did helipros. I bought this radio and 4 receivers for my helicopters because I was having glitching problems with 2 helis, I have 6 century scale helis. I like the radio but am nervous about it. This has never happened with my airtronics 8000d. Maybe I should have put up the glitching and saved over $700.00.

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09-19-2007 01:34 AM  10 years agoPost 49
HHawk

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Gardnerville Nv.

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Ya, sorry to hear it, but Im also glad to hear it as well. Its still appears to be a few isolated incidents.

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09-19-2007 11:33 AM  10 years agoPost 50
pgoelz

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Rochester MI

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HHawk (and anyone else),

For those of us following this, could you please summarize what happens when your radio reverses.....

1. Is it a function that reverses or a discrete channel? Ie., if you are you using eCCPM, are you sure it was the elevator function (which would involve all three servos) and not just one servo channel that reversed.

2. Has it ever reversed and then gone back to normal without any intervention on your part? Did it survive a power cycle?

3. From what I can determine, it has never happened after a successful initialization and controls check, right?

4. You said in your first post that you swapped channels around to fix it.... did you leave it that way or did it eventually revert to the original setup and require you to put the servos back the way they were originally?

5. Can you or anyone else determine if this is confined to a particular receiver type? I think I read that it has happened on at least two different receiver models?

Just trying to get a handle on what to expect / look out for. So far mine has been fine although I did have one unexplained motor start with the throttle stick at zero while working on a plane in the basement. I thought it was explained by a data loss or re-initialization with the throttle channel faildsafe set to 100% (the throttle channel was set up correctly but the receiver had not yet been re-bound) but I was never able to explain why it would do that with the receiver only about 2-3 feet from the transmitter. Maybe this was an example of the throttle channels reversing.

Paul (no, not that one)

Paul Goelz
Rochester MI USA
http://www.pgoelz.com

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09-19-2007 05:45 PM  10 years agoPost 51
Paul Beard

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Bigfork MT

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HHawk's system is on it's way to me.

Early indications from the service center look like the transmitter battery connector wires are loose from tugging or trapping in the battery compartment.

Loss of power on the transmitter by removing the battery without turning the DX7 off will cause it not to write the last configuration back to it's internal flash. In other words if you make a trim or servo reverse change without turning the transmitter off properly the DX7 doesn't have time to write that change back to flash.

The DX7 must always be turned off before removing the battery.

Paul

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09-19-2007 05:54 PM  10 years agoPost 52
artimus

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Buckley WA

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Nice to know...someone should write that in the owners manual.....seems kinda important

Fly Hard......Team Viagra

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09-19-2007 05:56 PM  10 years agoPost 53
RCHeliJim

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Orem, UT USA

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The DX7 must always be turned off before removing the battery.
Sounds like common sense to me to turn off any device before removing the battery, but good to have it here for those that maybe dont follow this procedure already. Thanks Paul for reading the forums.



Go Fly, Have Fun!!
-Team Quick UK

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09-19-2007 06:10 PM  10 years agoPost 54
HHawk

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Gardnerville Nv.

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What a stand up guy Paul is! It kinda makes sense but to reverse like it did is still puzzleing. I set it up and it was trimmed from the get go, never changed a thing except EXPO and gyro gain. So if it is the battery connection, why would'nt it just hold the last known memory? Also I checked the radio out and nothing was changed as far as expo or gyro gain. Those are things I keep a close eye on.

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09-19-2007 07:03 PM  10 years agoPost 55
artimus

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Buckley WA

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Some things cant be explained...all seem to be related to proper voltage. Will running a 11.4v 3 cell lipo harm the transmitter ?I'v seen post that people are doing it to get longer Flight time between charging and a quicker charge at the field......Any thoughts?

Fly Hard......Team Viagra

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09-19-2007 10:01 PM  10 years agoPost 56
HHawk

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Gardnerville Nv.

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pgoelz: It revearsed more than just an individual channel, besause I had to re-configure both to get it to fly.

Also, I never gave it more than a few on/off cycles to revert back,and to answer your question, No it did not revert back without intervention.

Disconnecting the battery before shut down is something I've never done nor would I do on purpose, but a bad connection as Paul stated, would simulate this. I am certainly hopeing it is a simple fix and not a serious problem with the technology. Theres no worse feeling than not being able to trust such a dangerous machine.

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09-20-2007 12:29 AM  10 years agoPost 57
pgoelz

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Rochester MI

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Failure to write to flash when disconnecting the battery without first turning the power off makes perfect sense. However, it would not seem to explain functions reversing or changing unless the unit can manage to write BAD data to the flash when the battery is disconnected.

Does the unit try to write when power is disconnected with the power switch ON and gets interrupted as power to the micro passes into a grey area?

Paul Goelz
Rochester MI USA
http://www.pgoelz.com

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09-20-2007 01:08 AM  10 years agoPost 58
HHawk

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Gardnerville Nv.

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It seems impossible, but it does appear to revearse when it is powered off. It never does it between flights in a day, if it starts the day working properly it finishes a day working properly.
Its after it sits for a few weeks that causes the problem. This last time it only sat for 5 days. The radio never got below 10.2 volts.

And another thing, the first time it was only the elevator that reversed. It got worse exponentially

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09-20-2007 10:51 PM  10 years agoPost 59
naz

rrApprentice

Medford, OR

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Hawk, my Spektrum module for my 9303 has been giving me fits. I JUST sent it in to Horizon (they should have received it yesterday)...it's glitching on me... however it too has reversed the inputs. Example; I use the radio for heli's and planes. On 3 occassions my flaps were going up instead of down. I then had to go into the radio and change from a positive to a negative throw % and fix the problem. Then, I would power up two...three weeks later and guess what? They would be reversed again...so would then readjust the flap travel to positive or negative...going back to the original setting. Weird... the glitches are what scare me. I hope the Spektrum team at Horizon can fix my problem..that system along with all 5 matching AR9000 Rx's for different models have cost me a lot of money. My heli would glitch right on my workbench just moving collective up and down. Tail servo would also glitch yet heli would not go into failsafe (throttle). Im sure they folks at Horizon will solve the problem!

Calvin

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09-20-2007 11:58 PM  10 years agoPost 60
HHawk

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Gardnerville Nv.

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I hear ya Naz, its frustrating. But the glitching is something I have never experienced. Maybe thats what would have happened eventually if I had run it after reversing was compensated for. Did your system start glitching after you reversed the reversing?
It will be very good news to hear what Paul finds with my TX and RX.

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HelicopterRadio - Spektrum DSM › DX7 anomole(Its the only one that has reversed​channels...TWICE!
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