Problems!! 14MZ 2.4 R6014FS

[Mithrandir]

OK... if there is a voltage regulator.. I can see it gets a little warm....

I did once entirely forget a Regulator and flew one of the 14 channel 2.4 ghz FASST Rx's on 8.2 volts direct... in a plane with 9 servos and 4 ESC's... about a dozen flights... without difficulty...
(I have heard the Rx's will run on up to 20 volts... but you didn't hear that from me!!! )

I think that if the issue has merit, then FUTABA Should (And will) post necessary information... but they can't issue a bulliton EVERY Time someone thinks they have a problem....
There are 72,412 Radio Control Topic Websites with Forums in the US alone... there is all kinds of info, both good and bad... rather truthful and "Mistaken" that can and does get related on these forums...

The over heat does sound like it has merit... but that opinion is based on a few other pilots experiance..... Not my experiance... It is in the Best interest of FUTABA to investigate this and make it right and I am sure they will....

Let me tell you all a true story.....

Back in 1974, (Before the Lemon Law)...there was a family that bought a brand new Chrysler LeBarron. They loved their new car....
Every nite after dinner, ... it was their habit to drive to the local Krogers Grocery and buy a half gallon of ice cream and take it home and have a little party with the kids before bed time.... well... occasionally.. the car would not restart after they came out of the store with their ice cream... and this went on for months.... only occasionally.... and then... one of them noticed that this only happened when they bought Vanilla Ice cream.... yeah... no kidding... only when they bought vanilla Ice Cream!!!

So.. Chrysler Le Barrons would not start if you bought Vanilla Ice Cream!!!!





Well.. some investigation revealed what was happening.... can you guess????







It turns out... that the store kept the Vanilla Ice Cream in Freezers by the Cash registers... so when they purchased the vanilla... they didn't have to walk to the back of the store and then return to the front to pay... they simply grabbed the Vanilla, walked 30 feet to the cash register and paid... and then returned to their car which would not start.....

Had they chosen Rocky Road, Butter toffee nuget crunch or Chunky Cherry Squirrel Sherbet, they would have had to walk to the main freezers at the back of the store and then walk back to the registers at the front of the store thus taking about 6 minutes longer....

THAT WAS THE KEY!!!


It wasn't the vanilla ice cream, it was the difference in time.... apparently the Carb did a vapor lock thingy, and the extra time used to get flavors other then vanilla gave the car enuff time to resolve this condition....

So my point is...

I forgot...


well.. OK.. I remember....

listen to the experiance shared here... try to take measures to keep suitable air going over the Rx to NOT get that hot, but the sky is not falling!

Exercise Caution... but don't panic!

I truly hope no one else has this issue...

[3dubya]

I got lipos in my plane, if they got as hot as numbers im reading where fasst may fail id be more worried about them catching fire all the fasst will do is log off and crash the lipo fire ball for me which is failsafe if you thing about it. Ive done 100 flights on fasst in me 3.1m xtreme 260, absolutely perfect piece of gear, heaps better than G3 for me.

[Leardriver]

Well for what it is worth I was able to duplicate the original problem almost down to a degree of what Lazun originally reported with both a R6014FS AND a R607FS rx on the bench just a little while ago. I used a heat gun and a Raytec IR temp gun to measure temp as it increased. Within a degree of each other they both "went red" at 167-168 degrees. I was able to "reboot" them around 150 deg. Both these rx are brand new (a few weeks) and were still in the box. I bound the R607FS just for the test. The flip side of this is that the 6-7-8ch receivers have been out now for a while and I don't remember hearing anything at all regarding any type of loss of signal in the air. Maybe it happened but I don't remember hearing about it(except for the service bulletin issued by Futaba some 6-7ch tx having the same coding or ID). I am honestly thinking that there is enough air flow through the fuse that the rx should be cooler in flight than on the ground. I am thinking about getting a Venom temp gauge like we used to use in heli's to record the peak temp on the rx. I am also thinking about how I can increase cooling to the rx. Perhaps a CPU fan and some sort of ducting for outside air to be channeled over the rx. I am not sure yet.

Now for those that are getting ready to say go get Spectrum...not so FAAST (couldn't help myself here...lol). A friend of mine, who is in the R/C electronics business, has actually disassembled and examined the spectrum satellite rx and taken the information right off the the chip and found per the manufacturers spec on their very own website that the chip is only rated Commercial (not industrial) and is good up to 70C or 158deg F. He has mentioned that customers have called him and mentioned the they have had a lockout or binding issue with the Spectrum setup but could not duplicate it. It is possible that they are suffering from a thermal issue as the Futaba is.

Here are the specs on the Spectrum chip he sent me. By the way..I am not trying to bash JR, just trying to pass on some info that may be helpful.



The guys at Spektrum use this chip CYRF6936-40LFXC in
every satellite receiver they sell.
This is a commercial temperature range chip, 0C-70C. See
page 31 of the data sheet attached.




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[bgold]

I see the giant heat sinks Fromeco uses on their regulators and have heard them say that getting rid of heat is one of the leading factors in how many amps they can deliver. I don't see anything like that on the receivers and I'm curious what kind of power the receivers that are having problems are handling.

[Radioactive]

Curious here, these temps are pretty hot, i just temped an electric motor after a 3d flight, and it was approaching 140.. man i couldn't hold on to it for long at all.. these temps are smoking hot ! In other words, somethings wrong somewhere with these installs as well.

[klhoard]

.
This is exactly why I have been and always will be an XPS fan. . . .
.

[Georg Schamberger]

I think it's not okay to accuse futaba these problems.
type in "xps lockout" in google,and then type in fasst lockout...
But back to the theme now.
Greez
Georg

[Kiwi]

WWHHHOOOOOOOOOOO!!!!!! George.

No on has even looked like accusing anyone of anything here and please guys lets not even include the XPS word in this thread unless its temperature related.

Somewhere I seen a post on another web site saying the little chip that does all the 2.4 Ghz processing runs at 1600 degrees F inside the receiver. Thats why or one of the reasons the 2.7 volt thingy is used.

I cant find it, I read it, I dont know if those numbers are a typo or not but if that is indeed correct then the Receiver sure as buggery will produce heat, no matter where it is.

If someone can find that information great, if its wrong then great as well.

[reyn3545]

OK... I'm in the 2.4 GHz busines, have been since the 90's...

If the receiver chip ran at 1600 degrees, you would melt the board its surface mounted to. I don't know whose chip they are using, and I'm not going to void the warranty on my receiver to find out, but suffice to say it probably runs at about 1/10 of that (at most).

Its not really about how much heat is produced, but about how much heat is managed. Remember about 5 years ago when Pentium chips found their way into notebook computers? The manufacturers were actually making water cooled "radiator" components that would sit on top of the processor. The metal exterior would transfer heat from the processor to the fluid (water) inside, the water would wick the heat about 6 inches away, where a fan blew over the metal pipe to cool the water inside. That cooled water cycled back into the processor area to begin the cycle again... all designed around the heat transfer properties of metal, water and air. (By the way, we saw THOUSANDS of processor chips fail because it was a crappy design, but the best that technology could afford at the time). Now, I'll admit, most of these notebooks weren't flying around our local fields, and the worst thing that could happen would be a little data loss. The industry eventually overcame the problem with technology, and the user community lived through a cycle of development.

We're all talking about the receiver chip or the power adapter, but it could be any of a number of components in the radio. There has to be a processor to manage all of this data, and I would suspect that's where you'll find the greatest heat source. Truth is, we'll never know... we don't need to. The folks that design this technology will work with their manufacaturing partners to identify and resolve the issue, assuming there is a real issue, and they'll get back to us, hopefully before anything happens that could be the fault of the conditions people are reporting here.

I haven't seen the issue first hand, but I certainly believe the folks that have seen it... so hopefully they'll get to the bottom of it quickly!

[dick hanson]

1600F? ludicrous- I wonder if these guys have any concept of real world , everyday temps of stuff we all use
melt point of solder we use 500f OR LESS
hot water 120 really hot water 140
inside a hot hot car 140+in sunlight windows up
Our radios - any of em ishould be shielded from direct sun- any of em - and the fuselage vented (aft preferrably to flow) air thru it - this is all we need .
the canopies will fallover and sag way under 200f --seen it a few times .

Proof - look at number of radios in use -if these heats were common -planes would fall out of the air -all over the place .
warm a piece of thick plastic to 140 f - now feel it -be careful !

[bgold]

Melting point of aluminum is 1200 F, 1600 would ignite wood as well as melt solder and plastic.

[dbrford]

Most silicon chips will start degrading at 350 C/660 F with failure at sustained temps of 350 C. As Dick stated other items on the board would start failing at lower temps. I am not implying that the this or any other receiver should should work in an airplane with fuse temps of 350 C, think it would combust at that point.