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Just for fun I took a 5014 PCM Rx and started to "cook it" with my heat gun. Now there is no link light on PCM... so I hooked up 1 single servo. I got that case as hot as I dared (240f - thats past boiling point right?) The servo still moved fine after 2 mins of super heating - the case was hot enough that touching it would burn your hand (not much but you would for sure feel it.)
I have been doing my testing on Rx's outside the airplane with no servo plugged in at all. Just a 4-cell pack (around 5 to 5.2v nominal.)
I did a 607 Rx - this time I kept the heat gun far back and heated slowly. It took quite a while but eventually it went red too. And it stayed red until the case was barely warm to the touch. This one went off at a much lower temperature - the case was only around 130f. I measured my cases on Monday in the plane after sitting in the sun for 10 or 15 mins. It was maybe 70f outside and the cases were at 121f.
When the red light comes on you can CLEARLY hear something go "click" in the Rx and the same when it comes back to green (on the 6014.) On the 607 I didn't hear anything.
Now I am a little worried. I will for sure be putting a cover over my canopy from now on though and I will keep an eye on things with my temp gun in case I am wrong. With air moving through the fuse the Rx should stay cooler - but letting it sit in the sun seems like a big risk.
Maybe something as simple as a white case that reflects heat vs. the black heat absorbing case would be better in a hot climate?
Gray - you fly jets right? How warm does it get inside the fuse? Have you ever seen any failsafes having the Rx mounted inside the fuse? I find it odd that an Rx burried inside a jet fuse would be okay and yet on my planes I seem to need to get the antennas up into the canopy... If I could put the Rx's away from the open canopy I know they would stay a lot cooler. |
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Yep, I fly jets and aerobatic models.
I have had no heat issues but to be fair…I live in England and we don’t get that many really hot days.
Thanks for the test on a standard rx, that tells us that it is definitely only the 2.4 rx that is ‘giving up’ at t a lower temp.
My RX in my Hawk sits under the canopy but down below the full depth detail.
I have no RX sitting under a large canopy directly.
To the best of my knowledge we have no reported issues else where in the world apart from the USA in the hotter climates.
Jets may not suffer the problem, (depending on installation) because we have a turbine sucking a lot of air from everywhere and it may cause more air movement in the fus than you are getting.
I have also done extensive testing with carbon, metal and fuel. None of these proved be a significant blocker of the signal.
The tests included placing an rx inside a metal tailpipe, inside a carbon fuselage. I got little or no deterioration of ground range.
I have tried to enclose a picture of my Hawk install.
Paul
Just found this interesting thread.
http://www.flyinggiants.com/forums/f...ansmitter.html