futaba recievers still overheating!

[dave g]

well bruce had the old overheating problem again in the final on sunday with the futaba 3vc hss.. receiver thermalled in the final causing total radio loss until it cooled down.

i seem to recal someone saying that putting it in french mode keeps it cooler as it uses less channels or less scanning,cant find any solid evidence of this but the usa guys are getting no joy from futaba with the same thermal issues.

any one know?

[DCM]

Dave, this is a long shot, but is it possible to bypass the +ve side of the servo's by hard wiring them to the receiver +ve, leaving the servo's -ve and signal wire in the plug, so the power going to the servo's isn't passing through the receiver?

[dave g]

i think we tried that last time when he was running the 1/5th scales and still did it..

its the fasst system that hes using,just thermals as soon as it gets warm.

[DCM]

thats crap then, no real work round unless you slow the system down, but the whole idea of running FASST, is response times.

[dave g]

yep,first warm day of the years racing and it thermals in the final..bang on cue same as last year.

looks like its going to have to have a spekky module fitted to it then if this french mode dont work.

[Northy]

The power just comes into the board and out again on a big thick PCB track anyway, so should cause any heat issues

G

[dave g]

from what i can gather its the 2.4 chip in the receiver that gets heat soaked then it shuts down..then comes back on when cooler.

[Northy]

Holes in the case? Bond a lil heatsink onto it? A fan?

G

[dave g]

its smd stuff graham,the case of the receiver is 60c when it thermals so lord knows what the board is at.

tried a fan before didnt work

[simoncrabb]

I've never heard of that happening before.

I had one of those receivers fail totally, but not overheat.

What sort of car is it in, why is it getting too hot?

[dave g]

2 high power servos and its in and enclosed receiver box which wont help but no choice..its only the futaba's that do it..remember loads of them doing it last year and the year before at slough.

[Northy]

Originally Posted by dave g

its smd stuff graham,the case of the receiver is 60c when it thermals so lord knows what the board is at.

tried a fan before didnt work

SMD stuff can still be cooled

[dave g]

sorry thought you meant put heatsink on smd..but we tried allsorts before..even on the 5th scale out of the radio box and still did it.

just wondering if anyone had heard of a fix or solution for it

[Northy]

if it's an smd ic it can still have an heatsink bonded into it.... if there's room.

G

[Chris Doughty]

have an RX box lid with holes in it that you run in the dry?

I remember seeing Savoya's car with a million holes in his RX box.

if you just do the lid you can switch it out if the weather gets wet

[dave g]

still does it chris..we had it mounted on the outside of the box on the 5th scale and did it.

i had heard that there were 2 different circuit board colours,one overheated the other didnt but futaba just deny anything.

btw this is with 2 different receivers of the same model number...tried another tx and module also.

fit a spektrum module or the 40mhz module and it doesnt happen

[bodgit]

Found this on another forum it might help

The suggestion by Futaba to stand the rx on its side has the effect of almost doubling the surface area for convective heat dissipation. So any rx generated heat can get away quickly rather than add to any other heat being absorbed.
The components that are getting over heated are (I am told) on the underside of the rx so this also gives a better route for the heat to escape rather than having to migrate up through the upper PCB and out through the top.


Read more: http://www.rcuniverse.com/forum/m_7807297/mpage_5/key_/tm.htm#ixzz0leacHEeh

[simoncrabb]

I guess you gotta get some serious cooling to it, maybe out of it's case, on it's side, heatsinked, with a fan, and a million holes in the radio box!

Add some belts and braces too...

[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

[dave g]

not sure what hes going to do,if it were me i would have the spekky module in it and not risk it,didnt know there were a couple of different futaba receivers