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T-REX 800 › Having Trouble Setting Up 3GX System
11-29-2015 11:36 PM  36 months agoPost 1
Heli_Splatter

rrElite Veteran

USA

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I keep getting the row of green lights blinking. Sometimes I power the system up and I just get the row of green lights.

Other times, it initializes the system and then goes to the green blinking lights.

I have rebound the 2ea DsmX satellite receivers to no avail. I am temporarily powering 3GX with a 6v NiMH through a 5.1v regulator. I have looked on line for other solutions and tried everything that I have come across.

This is on a Trex800

Any Ideas? Thanks Any way to reset the device?

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11-30-2015 01:40 AM  36 months agoPost 2
Russell Bear

rrApprentice

League City, Texas USA

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Dsmx, just making sure you are pressing the setup button while powering up with the bind plug installed. That's the process for dsmx.

Team USA Bavarian Demon
Citizen #705

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11-30-2015 03:01 PM  36 months agoPost 3
Heli_Splatter

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USA

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DSMX Receivers and 3GX unit.
Hey... thanks for responding. I got up and ran down to try this last night.. nope.. that did not fix the flashing green LEDs. I cannot get a bind at all when powering on and holding down the Set button. I am able to bind in DSM2 mode.

Ron Lund has a note on his website "Spektrum users should seriously consider using this setup (Receiver Connect) instead of using just remote receivers plugged into the 3GX. Using this setup it is possible to get a true DSMX connection. Using only remotes, it is not."

I hope to talk to Ron later about this.

With all the talk of trouble on the net using 3GX.. I am reconsidering my options. Seems that it works great for many..not so much for others.

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11-30-2015 05:55 PM  36 months agoPost 4
jason46

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MI

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I am temporarily powering 3GX with a 6v NiMH through a 5.1v regulator.
The 3gx is definitely not going to be reliable running dsmx sats at 5.1volts. If you must run 5.1volts depending on requirements of your setup you will need a separate receiver, which was the route I went. With dsmx sats the 3gx needs a healthy supply of 6volts, which really should be wildly stated somewhere in the manual.

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11-30-2015 11:41 PM  36 months agoPost 5
Heli_Splatter

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USA

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Working Now.
Thank you, you are right. The device is designed for max 8.4volt or a 2S Lipo battery. The 5.1volts seemed to work for a while. Once the low voltage was tripped the 6v NiMH battery would not work.

Now I am powering it correctly in the final condition. The 6V was just being used for setup... but it was not enough.

Thank you... I am still not bound as DSMX, will try that again tomorrow.

Other places on the web indicated the flashing LEDs were indicating loss of bind.

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12-01-2015 05:27 AM  36 months agoPost 6
dkshema

rrMaster

Cedar Rapids, IA

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Make sure you can supply adequate current for the servos under load AND your power source can supply that current and maintain 6 volts. 5.1 volts from a NiMh pack won't cut it.

-----

DSMx is a snap with the 3GX and satellites as long as your TX and satellites support DSMx, and ONLY if you are programmed with 3GX V4.0 or V5.0 software. If you are using any software prior to V4.0, the unit won't support DSMx.

To bind in DSMX mode you insert the bind plug into the lower right horizontal socket in the connector block then hold down the little black button on the 3GX WHILE you turn on power to the 3GX. You can let go of the button after you apply power. How and when you remove the bind plug will determine the kind of failsafe you will have.

Feed the 3GX good clean power of at least 6 volts and it will treat you right.

-----

For what it's worth, that 5.1 volt regulator with a 6 volt input is pretty much a useless combo. The regulator most likely won't work well, if at all.

A 2S LiFe pack direct to the unit works like a charm.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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12-01-2015 03:03 PM  36 months agoPost 7
Heli_Splatter

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USA

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Thanks and all is well.
Thanks for the tips... I do not know what firmwear version I am running. I will check it out and update it to 5. I know that I cannot bind DSMX mode.

As I said, the bird will be flying on 2S power. The NiMH was for the bench and it worked for quite a while @5.1v. When the battery got low and was then recharged, it would not reset the flashing LEDs.

Now I am back in business, but I ordered the HV BeastX after all the negative comments I have found on the web. It either works for you, or it does not.

I have BeastX on two other FBL helicopters, might as well make it three. I can use the 3GX on a smaller bird, where I can afford the damage.

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12-01-2015 11:57 PM  36 months agoPost 8
dkshema

rrMaster

Cedar Rapids, IA

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Until recently, I had a dozen helis up and flying trouble-free using the 3GX. Helis included Trex 250s, 450's, a 500, 550, Logo 550SX, Gaui NX4, two Trex 600Ns, and a Trex 700N.

Setup in all was pretty much uneventful, and the darn things just continued to work. Power has been supplied using the stock ESC in the smaller helis, a 2S LiFe pack in the NX4, CC BEC Pro regulators, and even the Trex 2 N 1 regulators.

I started with V2.1 software and ended up with V5.0. Early on, when experimenting with the 3GX on the bench, I found that 4 cell NiMh and NiCad packs were not to be trusted, even when fully charged. I also found out with those batteries, an inline "old school" JR heavy duty switch was not a good idea.

When I began feeding my 3GX units with solid, 6V power, and when possible (especially in larger helis) used more than power connection to the 3GX, found the things settle right down, program in a few minutes, and just fly, and fly well.

-----

With V4.0/V5.0 software, binding in DSMx mode is no problem. One thing I would mention is to set your TX to the 22 msec frame rate instead of 11 msec, when using DSMx and satellite receivers.

Much of the bad press given the 3GX, in my opinion, came from those who did not understand the need to supply power that was clean, ample, and at a minimum of 6V. I also suspect many of those same complaints came from people trying to use NiMh and NiCad packs.

In some cases, the complaints came from people using the 2.4GHz transmitter conversion kits from Spektrum to extend the life of their old 72 MHz transmitters, and attempting to use satellites with the 3GX. I found out early on that it could be done successfully, but if you didn't know the secret, that combination was a non-starter. It wasn't the 3GX unit's fault, it had to do with the way the 2.4 GHz conversion AirModule works.

I found similar issues with the same TX conversion module, Spektrum satellites, and the IKon controller.

-----

If the 3GX complaints were truly based in reality, with a dozen different heli installations, the odds dictate that I should be having problems with at least one machine. Most of my 3GX units came from the RunRyder classifieds, where I picked them up either used, or NIB, for an average cost of $50. I had also set up two to three 3GX for other users in the area, none of whom experienced any problems with the performance.

-----

I have since replaced about eight of the 3GX units with the GPro, and found the GPro to be even better, and the Bluetooth adapter makes changes at the field dirt simple.

I still have both of my 600Ns flying the 3GX, as well as a couple of 250s. The rest of my fleet is now GPro.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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12-02-2015 12:55 PM  36 months agoPost 9
Heli_Splatter

rrElite Veteran

USA

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I want to say thank you for taking the time to write that. I am going to re-read it several times.

Interesting that I was using a HD 3wire switch on the NiMH setup also. I only have two hands.

I have switched to the 2S lipo.

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