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tworst · 06-02-2014, 10:44 PM

I have just finished building a new TREX 450 Dominator with 3GX and Futaba R7003 RX, using SBUS connection from RX to 3GX and radio is T14SG, ESC programmed for 6.0V BEC output. After putting in the electronics, I immediately noticed the servos would jump every once in a while. Its not just your typical buzzing, but an actual movement of the servo, maybe 20 degrees or so, but very fast return to neutral position. Even my motor has kicked a couple times while in throttle hold. This is an all new system, all fully charged batteries, and stock kit. The issue has been observed for the last few days and I have no idea what could be causing it. There could be something operating in the area around me that I am not aware of, but I thought these modern 2.4GHz systems with frequency hopping were pretty immune to most types of interference. Right now, I am afraid to even maiden the bird due to the noise issue. Can anybody tell me what might be causing the issue I am having?

dvelez3 · 06-03-2014, 10:52 AM

What servos? Try changing the radio from 12CH mode to 14CH mode and see if that helps.

-Doug

tworst · 06-07-2014, 05:11 PM

I am using the standard align servos that come with the 450 DOM kit and I am already using the 14 channel protocol. I have done about a dozen flights now and have not noticed any ill effects while flying, but I still need to put it back on the bench and monitor it some more to see if the problem is still there.

Mr.HillBilly · 06-07-2014, 06:03 PM

Unplug the speed controller and power up the RX and such with a battery and see if the prob. goes away. You are pushing your luck flying with a glitch like that.

helicraze · 06-07-2014, 06:14 PM

Dont use sbus 2 port

brianapp · 06-07-2014, 08:57 PM

Tap and wiggle the wires where they connect into the RX and then FBL and try to get it to happen. Could be a bad wire or connection. Take the ESC/BEC out of the loop by unplugging them and using a separate RX pack. Keep trying to isolate the cause.

Range check the radio ( with the motor unplugged) with someone standing next to it to see if it gets worse.

Tap, wiggle and shake everything. Something is not right and it will not get better in flight unless you fix it first.

jsbach#1 · 06-08-2014, 08:00 AM

You want me to tell you whats causing the issue ? Because I had the exact same issue exactly the way you describe it, and I was running a DX9 Spektrum with two satellites. Your problem is a 3 letter word that starts with a "3" and it ends in an "x" and there is a "g" in between somewhere

For me, it was worse in the 3gx setup modes with my transmitter close to the heli. When I put the heli armed have a friend hold the radio 15 feet away and watch the heli (safely) it would go away.

Same radio system on a cheaper ar7200 beastx, was not doing the glitching.

06-02-2014, 10:44 PM	#1 (permalink)
tworst Registered Users Join Date: Feb 2011	Futaba system very jumpy I have just finished building a new TREX 450 Dominator with 3GX and Futaba R7003 RX, using SBUS connection from RX to 3GX and radio is T14SG, ESC programmed for 6.0V BEC output. After putting in the electronics, I immediately noticed the servos would jump every once in a while. Its not just your typical buzzing, but an actual movement of the servo, maybe 20 degrees or so, but very fast return to neutral position. Even my motor has kicked a couple times while in throttle hold. This is an all new system, all fully charged batteries, and stock kit. The issue has been observed for the last few days and I have no idea what could be causing it. There could be something operating in the area around me that I am not aware of, but I thought these modern 2.4GHz systems with frequency hopping were pretty immune to most types of interference. Right now, I am afraid to even maiden the bird due to the noise issue. Can anybody tell me what might be causing the issue I am having? __________________ IS FURY AND FIRE A RED LINE

06-07-2014, 05:11 PM	#3 (permalink)
tworst Registered Users Thread Starter Join Date: Feb 2011	I am using the standard align servos that come with the 450 DOM kit and I am already using the 14 channel protocol. I have done about a dozen flights now and have not noticed any ill effects while flying, but I still need to put it back on the bench and monitor it some more to see if the problem is still there. __________________ IS FURY AND FIRE A RED LINE

06-07-2014, 06:03 PM	#4 (permalink)
Mr.HillBilly Registered Users My HF Map location Join Date: Feb 2008	Unplug the speed controller and power up the RX and such with a battery and see if the prob. goes away. You are pushing your luck flying with a glitch like that. __________________ SAB Piuma 6S, Xnova LIGHTNING 4030/1000kV, Spirit FBL SAB Goblin 700 Q4530-500, Sprit FBL SAB Buddy Egodrift Tengu 3220HS/960kV, Spirit FBL TRex 450L 6S Spirit FBL

06-07-2014, 06:14 PM	#5 (permalink)
helicraze Registered Users Join Date: Apr 2008	Futaba system very jumpy Dont use sbus 2 port

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06-03-2014, 10:52 AM	#2 (permalink)
dvelez3 Registered Users Join Date: Jun 2007	What servos? Try changing the radio from 12CH mode to 14CH mode and see if that helps. -Doug

06-07-2014, 08:57 PM	#6 (permalink)
brianapp Registered Users Join Date: Oct 2009	Tap and wiggle the wires where they connect into the RX and then FBL and try to get it to happen. Could be a bad wire or connection. Take the ESC/BEC out of the loop by unplugging them and using a separate RX pack. Keep trying to isolate the cause. Range check the radio ( with the motor unplugged) with someone standing next to it to see if it gets worse. Tap, wiggle and shake everything. Something is not right and it will not get better in flight unless you fix it first.

06-08-2014, 08:00 AM	#7 (permalink)
jsbach#1 Registered Users Join Date: Nov 2013	You want me to tell you whats causing the issue ? Because I had the exact same issue exactly the way you describe it, and I was running a DX9 Spektrum with two satellites. Your problem is a 3 letter word that starts with a "3" and it ends in an "x" and there is a "g" in between somewhere For me, it was worse in the 3gx setup modes with my transmitter close to the heli. When I put the heli armed have a friend hold the radio 15 feet away and watch the heli (safely) it would go away. Same radio system on a cheaper ar7200 beastx, was not doing the glitching.

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