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HomeAircraftHelicopterHelicopter Main Discussion › Spektrum blinking
05-30-2015 06:42 PM  3 years agoPost 1
jason46

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MI

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On an ar7610 is it a concern to fly while the status lights are blinking?
This happens when the receiver does not connect immediately and my 3gx begins initializing causing drift(verified this watching movement values on a pc). I then reconnect power on the heli causing the receiver light to blink, I do not always turn the transmitter off.

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05-30-2015 07:09 PM  3 years agoPost 2
Fauropitotto

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Tampa, FL

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Do not fly if you're not seeing a solid light on your spektrum rx.

CTZN#564 | MSH MaxV2 770, SAB Goblin 700C, FPV Quad racers

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05-30-2015 07:34 PM  3 years agoPost 3
Stephen Born

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...

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05-30-2015 07:45 PM  3 years agoPost 4
dkshema

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Cedar Rapids, IA

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Before I really dive into this answer (and knowing that you've been seeing some odd behavior with your stuff recently) please refresh my memory on what transmitter you are using with your stuff.

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Dave

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05-30-2015 08:57 PM  3 years agoPost 5
jason46

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MI

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Stephen, I power down the transmitter between flights. I don't always power down the transmitter if I must reinitialize the 3gx due to the receiver not showing a status light immediately.

Most of the time the receiver does come on immediately, however sometimes it does not show the status light for 1-5 seconds and then I must reinitialize the 3gx.

I'm using a dx7se.

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05-30-2015 09:38 PM  3 years agoPost 6
rocket_33

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Mount Pleasant, Michigan USA

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Where are you from Jason? Maybe I can give you some help since I too am from Michigan

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05-30-2015 10:05 PM  3 years agoPost 7
Heli_Splatter

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USA

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It is safe to fly... the blinking indicates that the receiver lost power and the transmitter was not cycled.

Knowing what you did to cause this situation(unplugging receiver), you know you don't have a power problem because you caused it. You can fly with it blinking.

So if you are flying along and have a power interruption, when you land you will see the blinking receiver and know you have a power interruption problem.

If you want to play safe, shut everything off and start again. Or you could read about this in the manual.

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05-30-2015 10:08 PM  3 years agoPost 8
dkshema

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Cedar Rapids, IA

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You have a DX7se. This is the older, original DX7 version based on the JR 7202 radio. And it is capable of 11 msec frame rate operation. This is a DSM2 capable transmitter.

You are using an AR7610, a DSMx receiver. This is perfectly acceptable, and the receiver is fully compatible with your DX7se. When bound and operating, it will bind and operate in DSM2 mode.

I've run a series of experiments, and that is why I asked what transmitter you are using. I wanted to see if you were binding as a DSM2 system, or as a DSMx system.

Since you have the DX7se, you are binding and operating in DSM2 mode.

-----

A little background...

DSM2 receivers have the unique ability to confuse the user by blinking the yellow LED. Normally, the LED will operate in a fast flash mode when you start them up in bind mode. Start the bind process, they go out momentarily. Once bound, they come on solid and should stay that way - to tell you the RX is bound and operating.

DSM2 receivers also have low voltage detection -- what many have come to love as "brownout detection". If the power to the receiver drops below 3.5 volts and is restored, the yellow LED does a slow blink. As it turns out, if you cycle power on the receiver while keeping the transmitter ON, when the RX comes alive again, the yellow LEDs will be doing the slow flash to tell you power went away. That is ALL it is telling you.

If you turn off the transmitter while the RX is up and running, the yellow LEDs go off. When the TX is turned back on, the two hook back up and the yellow LEDS come back on and stay on.

---

When DSMx was rolled out, the fast flash to indicate bind mode was retained, and the yellow LEDs behave the same in a DSMx system when binding as they do with the older DSM2 stuff. Fast flash at first, go out, then when binding is complete, back on solid.

DSMx DOES NOT INCLUDE low voltage brownout detection, and if you cycle power to the RX, leaving the TX ON, the LEDs come back on solid.

If you turn the transmitter off, then back on, the LEDs go off while the TX is off, and come back on solid when the TX is back on and the two hook back up.

DSMx receivers don't have a mode where the yellow LEDs flash to tell you power has gone away.

When you bind a DSMx receiver to a DSM2 transmitter, the receiver binds and operates in DSM2 mode. In so doing, you get the low voltage slow flash indication when you cycle power on the receiver while leaving the TX on.

End of Background

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So, you have a DSM2 transmitter and a DSMx receiver. It is working in DSM2 mode. When you leave the TX on and cycle power to the RX, you're guaranteed to come back up with slow flashing yellow LEDs.

You know for certain WHY they are flashing. Because you interrupted power and left the TX power ON. Contrary to earlier posts, there is NO reason NOT to fly the receiver when the yellow LEDs are slow flashing, if you know WHY they are so doing. In your case, you killed power, and turned it back on, and the low power indication. Go fly and don't worry about the flashing LEDs.

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If you don't know why the yellow LEDs are flashing, then figure out the problem and fix it before you fly.

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Also, If you turn the RX on first, followed by the TX, the two will hook up just fine and there is no reason you shouldn't fly. Bad things will NOT happen if you turn the RX on first.

If the RX is on first, it will drive the servos to their failsafe position and won't drive the throttle output. Once you turn on the TX, it will scan looking for two open channels. The RX scans the band looking for your TX GUID (that the RX learns when you bind). When the RX sees your TX, the usual handshaking occurs, and the TX and RX link up and away you go. No bad stuff happens.

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Now, let's see what we can do with your 3GX, DX7se, and AR7610.

The 3GX should NOT be "finishing its initialization BEFORE the receiver does". The 3GX won't initialize until it has a bound and operational receiver connected. It shouldn't light up, nor should it do the swash up/down/up/down/up/down thing before the receiver is linked to the transmitter.

Do you have a satellite receiver connected to the AR7610, by chance? The AR7610 will operate with or without the additional satellite. If you have a satellite connected, it must be a DSMx satellite (even if you're using a DSM2 transmitter). If you have a DSM2 satellite connected, operation can be unpredictable, if it works at all.

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By the way, I think by now you have V5.0 software installed in your 3GX. If you happen to turn the transmitter OFF FIRST, then later go to fire everything back up, the 3GX will NOT initialize until you cycle power. If you've turned the TX OFF first, and then power everything up, all LEDs on the 3GX will flash rapidly and the unit won't initialize. If you cycle Rx power, then it will come up, initialize, and work.

-----
Dave

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05-31-2015 12:14 AM  3 years agoPost 9
jason46

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MI

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Wow that is alot of info, I'll need to absorb that later.

I never turn the radio off first, but I sometimes don't always cycle it with the receiver depending on how annoyed I am, that was my concern.

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05-31-2015 12:59 AM  3 years agoPost 10
Heli_Splatter

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USA

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I think that the comment that you can turn the receiver on first should be prefaced by saying that the batteries driving the motor should not be plugged in first.

You just never know what might happen, so a a cardinal rule, I always say radio on first and off last.

You should always perform a rebind after any radio setup work is done. Binding sets the fail safe positions of servos and switches. You really need to read the material that comes with a receiver.

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05-31-2015 01:15 AM  3 years agoPost 11
jason46

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MI

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Now, let's see what we can do with your 3GX, DX7se, and AR7610.
The 3GX should NOT be "finishing its initialization BEFORE the receiver does". The 3GX won't initialize until it has a bound and operational receiver connected. It shouldn't light up, nor should it do the swash up/down/up/down/up/down thing before the receiver is linked to the transmitter.
Do you have a satellite receiver connected to the AR7610, by chance? The AR7610 will operate with or without the additional satellite. If you have a satellite connected, it must be a DSMx satellite (even if you're using a DSM2 transmitter). If you have a DSM2 satellite connected, operation can be unpredictable, if it works at all.
On power up the receiver "most" of time shows a solid status light instantly, but occasionally the time before the receiver shows a status light is not immediate and varies, if the receiver happens to take longer to show a status light it does not seem to visibly effect the startup of the 3gx, HOWEVER while connected to a PC the 3gx on the "Movement Speed" screen will show 16-17 points from 0 and this results in drift which sometimes results in scuffed blades

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05-31-2015 01:27 AM  3 years agoPost 12
dkshema

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Cedar Rapids, IA

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Are you using just the AR7610 or do you have a satellite with it? If you have a satellite is ut a DSMx satellite?

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Dave

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05-31-2015 01:28 AM  3 years agoPost 13
jason46

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MI

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Sorry I forgot to mention, I am using a satellite. The time before the status light on the sat comes on does not seem to effect the 3gx.

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05-31-2015 01:44 AM  3 years agoPost 14
dkshema

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Cedar Rapids, IA

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Is the satellite a DSMx satellite?

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Dave

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

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05-31-2015 02:04 AM  3 years agoPost 15
jason46

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MI

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Yes it is the sat that came packaged with the receiver.

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05-31-2015 02:39 AM  3 years agoPost 16
dkshema

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Cedar Rapids, IA

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Thanks, just trying to eliminate potential causes.

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Dave

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05-31-2015 07:08 PM  3 years agoPost 17
dkshema

rrMaster

Cedar Rapids, IA

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Here is even more of a wild and crazy idea.

Just for fun, don't use the external AR7610, plug satellite receivers directly into the 3GX unit. Bind, see how the 3GX behaves. If your heli is larger than a 450, you'll want both satellite receivers.

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Dave

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

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06-01-2015 12:51 AM  3 years agoPost 18
jason46

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MI

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Well, that is the reason for the receiver, the koby is set at 5.2 volts and I have already proven that is too low for just sats.

Maybe it's trying to tell me it's time for a new radio.

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06-01-2015 01:17 AM  3 years agoPost 19
dkshema

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Cedar Rapids, IA

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OK -- now I remember how we got into all of this!

-----
Dave

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

Team Heliproz

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