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Radio - Spektrum DSM

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Spektrum brown out. Who what why where and when?

Quicktoy

Senior Heliman

Sarasota, FL USA

Ok. Here's what happened. I have a dx7 paired to all my birds with ar7100r receivers. Everything is new within 3 months. I was flying yesterday my 700 and I lost control for about a second. Recovered and landed. Figures I'd put the bird up and figure it out later

I pulled out my vision. Flew it for a tank and was practisinf some autos when at about 10 feet I lost signal again and by the time I got it back the vision had crashed. Luckily blades and boom

I went home fired up my 700 stood about 20 feet away and jiggled the sticks for 10 minutes and all of a sudden the satelite orange light went out for a second and the servos froze. Then I put the radio down and watched the light and sure enough 5 seconds later the satelite light turned off for a second then I heard the servos glitch when it re engaged

I swapped setup for my 700 to another dx7 today. Flew the 700 for 3 flights with no problems. How can a new dx7 have this problem? I checked battery connection and it's good. It has a lipo in it which can't be the problem. Anyone else had this or similar experience?

Srimok X2, Avant Aurora, Trex 700 Suzi Hans, 700 LE, 700 FBL, Trex 450 Pro X2, HC500, $50 Gaui 425

07-03-2009 Over year old.
Dood

rrProfessor

Wescanson

The operating voltage of Spektrum rx's is 3.5- 9.6V.

Even if you have a lipo & a regulator, if the regulator can't deliver the current, thats when you'll have problems.
Go to that 3.5v range, the rx stops working. So there you go.

It's not the not the tx or rx's fault, its the other equipment you have on the helicopter.

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07-03-2009 Over year old.
jackheli

rrProfessor

Vancouver - Canada

It's not the not the tx or rx's fault, its the other equipment you have on the helicopter.
If that was the case how come the new dx7 transmitter did not show the same receiver voltage issue?

It's easy to find an excuse to do wrong. Hard is not to find an excuse to do right.

07-03-2009 Over year old.
Quicktoy

Senior Heliman

Sarasota, FL USA

I'm running helis on 2 cell lipos and all servos are in 8 volts besides tail. Not even close to 3.5 volts. When I recharge the birds aren't even below 8 volts

I was saying I run an outrage lipo on my radio

Srimok X2, Avant Aurora, Trex 700 Suzi Hans, 700 LE, 700 FBL, Trex 450 Pro X2, HC500, $50 Gaui 425

07-03-2009 Over year old.
Dwntyme

Senior Heliman

U.S.A.

Hummm a single 2 cell lipo?
what regulator?

Love a Twitchy Heli.... :) and Remmington Model 700

07-03-2009 Over year old.
Dwntyme

Senior Heliman

U.S.A.

If you are on a single 2 cell lipo(7.4v 8.39v give or take) and the servo's are on the 8v outputs of the 7100r the servos are (under load) taking the voltage away from the RX. A single 2 cell lipo just can't supply the voltage needed to maintain.

Love a Twitchy Heli.... :) and Remmington Model 700

07-03-2009 Over year old.
Quicktoy

Senior Heliman

Sarasota, FL USA

Like I said in the first post I run the ar7100r receiver. It has a built in 8 volt and 5.1 step down for throttle and tail. Like I said it's nothing to do with the voltage and everything to do with the radio

Srimok X2, Avant Aurora, Trex 700 Suzi Hans, 700 LE, 700 FBL, Trex 450 Pro X2, HC500, $50 Gaui 425

07-03-2009 Over year old.
Dwntyme

Senior Heliman

U.S.A.

Then check your antinna connection in the TX....I still think the AR7100R is under suppied for your setup.

Good luck

Love a Twitchy Heli.... :) and Remmington Model 700

07-03-2009 Over year old.
Jeff polisena

Elite Veteran

westpalmbeachflorida usa

I'm not thinking RX (heli) is problem . I had DX7 do this it was connections on TX reg . I re soldered and all was fine .

I stole it ,flew it and gave it back ;)

07-03-2009 Over year old.
Quicktoy

Senior Heliman

Sarasota, FL USA

Antannaes good unless there's just something wrong with it. What do you mean the receiver is under supplied? I want 8 volts to everything. I'm running ds610s designed for 8 volt

Srimok X2, Avant Aurora, Trex 700 Suzi Hans, 700 LE, 700 FBL, Trex 450 Pro X2, HC500, $50 Gaui 425

07-03-2009 Over year old.
DougsRC

rrProfessor

Mass.

Then check your antinna connection in the TX....
Take a look, my bud Ken had one of the two RX wires that pulled out but was still connected--barely---- caused the heli to dropout of the sky at 100 ft away. Doing a range check we also found there is better reception when the TX antenna is bent upward at 45 degree's and both RX wires out at 90 degree's, not saying its your problem but things to check.

07-03-2009 Over year old.
Quicktoy

Senior Heliman

Sarasota, FL USA

Can't be a receiver wire because all my birds are doing it with same radio and had no probe when I switched radios

Srimok X2, Avant Aurora, Trex 700 Suzi Hans, 700 LE, 700 FBL, Trex 450 Pro X2, HC500, $50 Gaui 425

07-03-2009 Over year old.
HydroJoe

Senior Heliman

SF,CA

I have had 2 "lockouts" with my DX7/6100Rx on one of my 450s. It was only on one 450. I can only assume, it may have been a problem with the RX (as I have never seen the problem on any other heli.) In fact, the lockout was not even long enough to freak out and land....it just made me say...WTF was that. I have sold the heli and have not heard of any problems as of yet. Mabey it was a wierd issue between my Tx and the Rx?

Now...this was not a "brown out" (the LEDs were still solid, batts fully charged.) Just thought i'd share an odd spectrum failure I have experienced. Even with these freak happenings....I still am pro Spectrum.

It does sound as though you have a problem. The fact that it happens on multiple helis tells me it's likely an issue with the Tx. You said yourself, when you change the Tx the problem goes away. Send the Tx in for warr repair.

Mabey I missed it but is this a real brown out? Are the Rx LEDs blinking when it fails. If they are not, you can probably rule out voltage issues. And....to asnswer your question....Any piece of electronics can fail brand new, with no explination. I have seen $100,000 (work) equipment fail out of the box. Just happens.

T-Rex 450 SE V2 , T-Rex 600 NSP, Stryker F27 C....Yea, it's a plank.

07-03-2009 Over year old.
denheli

Veteran

aurora,co

I have had the same kind of problem with my DX7/AR7000s. One of my 50's went and now this has cost me a 90 size. Sending it back to Horizon and have them check out both Tx and Rx's.

In the meantime I am trying futaba FASST 2.4 system. Looks like I may be changing systems.

Always Learning LOGO 400 V-bar, TT R50 V2 Blue, RJX Xtreme 50, Vibe 50N, TZ Frenzy 50.

07-03-2009 Over year old.
Rick_H

Key Veteran

Boulder City, Nevada

You had the problem with two different heli's and the problem went away with a different TX, So I don't see why anyone is trying to point you to the RX. You are right the problem is in the TX. You said you are using 2s LiPo, is this in the TX? If it is try putting the original battery back in. Spectrum does not recommend using LiPo's in there TX's because the regulator in the TX is not rated for it. I'm not saying this is the problem as many are successfully doing this but it is a place to start. Also check to make sure the binding button is not stuck in reducing your TX power to fail safe check level. Also try rebinding all the heli's again.

Some things to check.

Rick

07-04-2009 Over year old.
Santiago P

rrProfessor

South West, Ohio

Even if you have a lipo & a regulator, if the regulator can't deliver the current, thats when you'll have problems.
Go to that 3.5v range, the rx stops working. So there you go.

It's not the not the tx or rx's fault, its the other equipment you have on the helicopter.
That is Gospel on Spektrums.

Let me ask, WHAT kind of CONNECTOR are you using between the lipo and your RX?

A std J-connector is only good to 5 amps. If THAT is what you have, THERE LIES YOUR PROBLEM! A single J connetor is a deadly bottleneck!

My buddy had THE SAME brown out issues at one point with the SAME setup. He switched to DOUBLE J leads out of the lipo thru 2 switches into the RX. NO MORE brown-outs!

hope that helps

Santiago

07-04-2009 Over year old.
HOMEPAGE  
HydroJoe

Senior Heliman

SF,CA

You said you are using 2s LiPo, is this in the TX?
No... 2s as a Rx batt. The Tx wont even work on 2s (as it's only 8.4V max.)
try putting the original battery back in. Spectrum does not recommend using LiPo's in there TX's because the regulator in the TX is not rated for it.
And....don't belive everything you read in forums.....3s lipos work great in a DX7. It just might be the best upgrade I have done. How many people have (that you know) actually fried a TX?

T-Rex 450 SE V2 , T-Rex 600 NSP, Stryker F27 C....Yea, it's a plank.

07-04-2009 Over year old.
Rick_H

Key Veteran

Boulder City, Nevada

HydroJoe

As I said in my post a lot of people are using them successfully, but when you are troubleshooting an issue you look at all possibilities. And I do believe them as I have seen the spec's on the Regulator, a fully charged LiPo is above Spec.

MoneyPitVictim
Why are you looking at the RX when the problem went away with a different TX?

Rick

07-04-2009 Over year old.
Whopper Chopper

Senior Heliman

Atlanta, GA

I am having the same problem.. Almost lost my TZ-V2 and newly built T-Rex 500. I installed a regulator in my TX some time back and I need to recheck the solder joints..

07-04-2009 Over year old.
denheli

Veteran

aurora,co

I am not using a Li-po in the Tx, just a Nimh 1500Mah sanyo. Rx batteries are Formeco li-ion 2600Mah. I re-bind the helis before I go to the field each time just to make sure. ALL my batteries charged the night before I head to the field and I use an 8-ball voltage checker after each flight.
Bind button works fine.
Only thing I can think of is this issue is in the Tx.

Always Learning LOGO 400 V-bar, TT R50 V2 Blue, RJX Xtreme 50, Vibe 50N, TZ Frenzy 50.

07-04-2009 Over year old.
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Radio - Spektrum DSM

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Spektrum brown out. Who what why where and when?

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