futaba recievers still overheating!

[super__dan]

Dave, see edit, I'm no longer sure I'm right

[col300]

Originally Posted by super__dan

Dave there are two receivers you can use with the Futaba, the top one comes with it and has 2 aerials (1 is internal) and then there is a lower spec 2.4ghz one, not sure it's high responce, which sounds like what you want???

EDIT, I think I'm talking rubbish here now I've looked as the 603GF says is not compatible with FAAST

Think you are right Dan, the receivers are R603FF and R603FS though.

[ianjoyner]

I've run both the R603FF and R603FS, the FS is the one with two aerials, I couldn't tell the difference between them in range or resposne.

My understanding of the over heating issue is that it is a component tolerance, rather than an intentional thermal cut off. So basically they stop working, the actual temp varied quite a bit between receivers. I believe Futaba started testing them and basically not selling the ones with a low tolerance. A gold spot on the receiver should indicate that it is a more recent receiver and should be okay, even some with out gold spots should be okay. I don't believe the problem has ever been due to heat actually generated by the receiver. I think the heat can only come from either something hot near by, or the high power servos pulling current through the connectors and PCB. The receiver shouldn't be getting to 60C, I run them on electric cars and I've never noticed them above ambient. If your box isn't touching anything hot I would make sure you've tried bypassing the receiver with the red lead, not even connecting the servo red lead to the receiver.

Most of my understanding has come from talking to Ripmax the UK distributor, give them a call, they may be able to help, especially if you have one of the older un-tested receivers.

http://www.ripmax.com/rm_contact.asp

[dave g]

as you say,you run electric and only 1 servo,we use 2 under high load,the big plane lads are the same so i think thats why electric lads dont see this problem,and it only happens after around 15-20 mins which is in a final.

if you saw the amount of 8th cars that had runaways over the last 2 years or thermal shutdowns on the futaba receivers on hot days you wouldnt believe it.

all suggestions been tried im afraid,the usa forums are full of the problems..and no positive fixes since futaba wont acknowledge a problem.

thanks anyways.

[steelie600]

There is a fix, GET A SPEKTRUM!!! not once have i had a thermal shutdown and ive been using the same rx for 18 months and in exactly the same cars as those that have been shutting down with the futaba's.

Same with the KO system getting intereference due to overheating, the spekky just doesnt get it. Its the DSM system you want not the DSM2 as that is also fraught with issues but the original DSM as found in the DX3s, DX3.0, DX2.0 is so reliable its untrue

[dave g]

yes thats the only other step which is what will be happening i think if this french mode dont work.

[ianjoyner]

If the servos bypass the receiver I don't see why it matters how many servos you have? Both the red and black wires would have to avoid the receiver.

[dave g]

well ran it today at deerdale solid for 40 mins in french mode, receiver was barely warm so hopefully this may cure it.. whether it changes when there are other 2.4 systems running i dont know but certainly worked fine today

[rcdunk]

have had this problem at the last 3 rallycross nationals
the car runs fine all day through quali not a problem in any shape or form
first final 10 mins not a problem bump up 5 to 7 mins into second final car just shuts down dead nothing happening

any updates on solutions ? judt dont want it happening again starting to piss me off a bit lol contemplateing going back to 40 meg

going specktrum not really an option spent enough getting 2.4 ghz futaba as friends had had problems with their early stuff

[dave g]

nope
bruces started doing it again so he got a sanwa exzes plus like mine,no problems now

sorry cant be anymore help but futaba wont acknowledge theres a problem so therefore no fix im afraid.

you could try the french mode which i think is on the module in the tx and mount the receiver on its side so air can flow around the bottom of the receiver as thats where the 2.4 chip is located and where it thermals.

[rcdunk]

so phone call to ripmax is not worth the bother then lol cannot afford to go changing handsets etc look's like its back to 40 meg then

had a think about it and its only done it this year since changed car gone from losi (mounted at front) to rc8b (mounted at the back) wondering if the closeness to the engine is causing it to thermal out

[stox217]

Try taking it of high response and see what that does?

[dave g]

its the 2.4 chip that overheats.

the futaba is constantly scanning and channel hopping,it does this hundreds of times a second if i recall

in french mode there are less channels so it doesnt scan as much or the scan is slower,so less overheating,but it still does it.

i dont think there is a workaround but keep looking you never know..

[rcdunk]

its not a high response one anyway

will keep looking and see what I can find if not back to 40 meg me thinks lol still got friends running 40 meg they have not had to change x tal's all year seams no point using 2.4ghz if you dont have to keep changing lol