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01-04-2013 02:11 PM  5 years agoPost 1
cwright

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Blossvale New York

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I have a customer that has a 3GX V 2 and he is going to use satellites with it. He has a Spektrum DX7 DSM2 transmitter. Does he need to use DSM2 or DSMX satellites? I couldn't find it in the manual. I thought I heard that you have to use DSMX but I might be getting this confused with the Spektrum AR7200BX. Thanks. Chuck

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01-04-2013 02:14 PM  5 years agoPost 2
gordart

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Lansdale, PA USA

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I use 2 DSM2 sats with my 3GX v2.1 with no problems.

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01-04-2013 02:23 PM  5 years agoPost 3
wrongler

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Brewerton, New York

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Usually if its the wrong sat. (DSMX or DSM2) It will not bind! But not always.

Bill Whittaker

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01-04-2013 06:11 PM  5 years agoPost 4
moparherb

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Fulton, NY Syracuse Thunderbirds

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Chuck, on my 550 3GX I use two JR satellites that are DSMX,but I'm sure two of the same kind of DMS2 will also work. I don't think you can mix DSMX and DMS2 though. Hope this helps.

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01-04-2013 06:33 PM  5 years agoPost 5
cwright

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Blossvale New York

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Thanks Herb. You are correct that you can't mix the satellites. Thanks everyone. Chuck

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01-04-2013 09:06 PM  5 years agoPost 6
coolice

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Northamptonshire, England

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Hey.

The 3GX will currently only bind in DSM2 mode, it does not yet support DSMX.

As above use two of the same satellite receivers, either two DSM2 or two DSMX.
.

Ian Contessa
Team Robbe SchluterUK
Midland Helicopters

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01-04-2013 09:33 PM  5 years agoPost 7
THEDOGGFATHER

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new zealand

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Hi
Sorry I'm new to the spektrum thing, can I use a dsm2 transmitter and dsmx satellites on a 3gx, or will the transmitter and satellites not work together.

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01-04-2013 09:42 PM  5 years agoPost 8
coolice

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Northamptonshire, England

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Hey.

Yes, DSMX sats are backwards compatable to DSM2. So they will bind and work with your DSM2 set perfectly.
.

Ian Contessa
Team Robbe SchluterUK
Midland Helicopters

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01-05-2013 12:56 AM  5 years agoPost 9
moparherb

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Fulton, NY Syracuse Thunderbirds

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3GX will definetly bind to DSMX. I have two of them bound to my Trex 550 with 3GX.

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01-06-2013 09:18 PM  5 years agoPost 10
dkshema

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Cedar Rapids, IA

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DSM2 or DSMx satellites work equally well, just make sure you have the SAME type in an installation -- do not mix DSMx/DSM2 components.

Yes, DSM2 transmitters work equally well with DSM2 AND DSMx receivers. DSMx Transmitters work equally well with DSM2 AND DSMx receivers. Just NEVER mix DSMx and DSM2 receiver components.

As for using the 3GX with satellite receivers in general, whether they be DSMx or DSM2, make absolutely certain that the power for the entire system is robust and sufficient to supply adequate power under all conditions. I'm finding the 3GX/Satellite route to be quite unforgiving when it comes to the power you give it.

-----
Dave

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

Team Heliproz

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01-08-2013 11:56 PM  5 years agoPost 11
crashrc

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Lafargeville, NY

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3GX Satellites
Do you need to use both satellite rx, or can you get by with only one.

I also noticed during my setup if you pump the cyclic repeatedly and quickly it stops moving. I am using a CC pro bec, and align ds610 servos in a 550E. Is it possible the 3GX unit is bad.

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01-09-2013 01:43 AM  5 years agoPost 12
dkshema

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Cedar Rapids, IA

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The 550e needs two satellites to provide adequate in-flight recevier coverage. With 450 and smaller you can get away with a single satellite. One or two is dependent upon the heli size, just as it is with "normal" Spektrum receivers.

Check your power system, including making sure you have adequate wire to handle the current. You have a BEC Pro, how did you use both of the power cables coming out of that?

Post some good clear pictures of the setup. I've noticed that when using the 3GX with satellite receivers, you need to have a good, solid, power source with wiring capable of handling the current.

I had a 550e that had been flying quite well on its original 3G system until its third season when I started seeing unexplained tail kicks. At the time I was using a CC ICE 100 and its built-in BEC for power. I changed out the 3G system for a 3GX controller, retaining the AR7000 external receiver and its satellite as the receiver for the 3GX.

This setup worked well with SW version 2.1. I recently upgraded to V3.0 and found that the system would go nuts randomly, when you moved the cyclics, or just tapped the 3GX itself.

I had a BEC Pro, still new in the bag, so I pulled that out, hooked it up, programmed it for 5.8 volts out, and hooked it up, using BOTH of the output pigtails. All the weird behavior simply vanished. I'll probably bump the output voltage up to at least 6.0 volts, too.

As this is a 550e, it has DS610s and a DS620 for servos.

-----

In another installation that I'm currently working on, I'm installing a 3GX controller in a Gaui NX4. This has four Align DS515s and a DS525 in it for servos. I am also using the 3GX controller with two DSMx satellite receivers, eliminating the "standard" external receiver this time. While setting the heli up, I have been using a couple of 1800 mah NiCad 4-cell packs. If I plug the pack directly into the 3GX system, it works fine. If I install a JR heavy duty switch harness between the battery and the 3GX system, I experience the same behavior that you are seeing. When moving multiple servos, the system will hiccup momentarily, and the LEDs on the satellites will begin to blink slowly. Remove the switch harness, plug in direct, all bad behavior ceases.

I believe that the 3GX system, when teamed with Spektrum satellites, is susceptible to noise on the power lines. This tells me to keep the cable between the battery and the 3GX short, and to use heavy duty wire harnesses.

-----

Going back to my 3GX/550e installation, I plugged ONE of the two power output cables from the BEC Pro into the standard "power input" of the 3GX system, that being the horizontal connector on the bottom left corner of the 3GX unit. To hook up the second power lead I did the following:

As this installation uses a separate AR7000/satellite receiver setup, I'm using the two cables supplied with the 3GX unit to go between the 3GX controller and the various RX outputs. The receiver is getting its power from the "power out" port of the 3GX unit, the horizontal connector on the bottom right corner of the 3GX connector block.

As I am using the CC ICE 100 ESC and an external BEC, I pulled the red lead out of the ESC to 3GX throttle cable to isolate the CC ICE 100 BEC output. I then pulled the RED wire out of the second power plug of the CC BEC Pro and plugged it into the ESC plug where I had just removed the ESC's red wire to isolate its BEC output. This left me wondering WHERE to hook up the remaining ground wire from the second power output plug of the BEC Pro.

The cables going between the 3GX system and the RX each have a plug with a single contact in it, these ends plug into the RX servo output ports. Since the bottom pin is unused in these connector blocks, and that pin is ground, I simply plugged the remaining ground pin from the second BEC Pro output into one of the ground locations of the RX connector blocks. Works like a champ.

-----

Since you're using the 3GX with satellites, you can apply the two BEC Pro outputs as follows. Plug one of them into the 3GX "power input" plug, the horizontal connector on the bottom left corner of the 3GX unit. Plug the remaining BEC Pro output into the "power out" connector of the 3GX controller (the bottom right horizontal connector of the 3GX unit). Then bump the BEC Pro output voltage to at least 6.0 volts. This should give you adequate current carrying ability, should allow you to use both power output plugs of the BEC Pro, and should eliminate the hesitation that you are seeing during operation of the cyclics.

-----

Oh yes, almost forgot. Make CERTAIN that you are using two DSMx satellites, OR two DSM2 satellites. Do NOT, under any circumstances, use one of each type at the same time.

-----
Dave

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

Team Heliproz

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01-09-2013 05:55 PM  5 years agoPost 13
crashrc

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Lafargeville, NY

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Dave,

Thanks for the detailed report. I don't recall my older 3g unit being such a current hog. I just started setting up the 3gx and was using only one of the power taps on the CC pro bec. Along with that I had a hanger 9 meter plug in series to monitor the current. I had purchased the 3gx unit from another rr member so I am not sure what version is installed. You had mentioned version 3 software had caused erractic problems possible due to insufficient supply from bec. Tonight I will plug in the 2nd tap, remove the meter and verify 3gx version. Oh, and install the 2nd sattellite. Hopefully this will solve the problem.

Thanks again.

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01-10-2013 04:20 AM  5 years agoPost 14
dkshema

rrMaster

Cedar Rapids, IA

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Crash -- try just removing your in-line current meter. In some of my recent 3GX setup experiences, I had been applying power to the unit (for setup purposes) using a 4-cell 1800 mah Nicad pack. To make setup life easier, I inserted a heavy-duty JR switch harness between the battery and the 3GX power input connector.

I had all sorts of trouble -- as you're seeing -- when moving the swash up/down the 3GX would hesitate, the satellites would start blinking, and within a second or two, the system would recover.

Intrigued, and thinking the switch contacts may have some excessive voltage drop, I replaced the switch harness with a 6-inch heavy duty aileron extension. Same problem.

I then plugged the battery directly into the 3GX box, all was quite happy.

I think the 3GX unit wants to see some really clean power on its input when using satellites as its main receivers.

So remove that in-line meter and plug directly into the 3GX. See what happens.

-----
Dave

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

Team Heliproz

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01-11-2013 02:33 PM  5 years agoPost 15
crashrc

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Lafargeville, NY

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Dave,

Like you said, removed the meter and all is fine. I never would have imagined the meter or as you said a switch would cause this problem.

Thanks again for the help!

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