VTX caught on fire yesterday, anyone know why?

tylorwashere

tylorwashere

Well-Known Member
20160418_145805-480x853.jpg I was well within operating voltage, and I had used it multiple times before, although just to tset it and show people my goggles. About 5 minutes into my first fpv flight (which was amazing btw), I brought my quad down and was looking at something when I noticed it started to smoke. There was no throttle or anything being applied, it was just sitting there. Do you think this is just a freak occurrence or if I replace it will it happen again
 
tylorwashere said:
Antenna was on tight, I was getting good video until it caught fire
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Well it needs a new VTX. :) If it has correct power and a good ground, not shorted and antenna is making good connection, not much else is left.

I was reading somewhere (IBcrazy antenna guy) that if you have a poorly tuned antenna it can cause the vtx to get really hot. Maybe look into that as a possibility.
 
Jackson said:
So basically it needs 7V to run, let's call it 8V. An ideal source would be a 2S lipo. So if you are running it with a 3S lipo the difference between the pack voltage and what it needs is simply being burned off, hence the heat.
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If it can handle 16vts and 11.1vts is applied you wouldn't think it would burn up unless its defective.
 
You're missing the point, overheating VTXs is a common and ongoing problem. Lowering the input voltage will lower the heat, it's just that simple.
 
Jackson said:
You're missing the point, overheating VTXs is a common and ongoing problem. Lowering the input voltage will lower the heat, it's just that simple.
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I understand and dont disagree with the laws of electicity. If its designed to handle up to 16vts and it burnt up then its defective, right? Thats all im saying. I think I have a 5-12vt vtx that is still running strong on 12.6vts. Cameras on the other hand, ive been through 3 of them. After crashing. :)
 
Altsickeness said:
Well it needs a new VTX. :) If it has correct power and a good ground, not shorted and antenna is making good connection, not much else is left.

I was reading somewhere (IBcrazy antenna guy) that if you have a poorly tuned antenna it can cause the vtx to get really hot. Maybe look into that as a possibility.
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It would have to be very poor though. Were you using a 2.4 antenna?
 
GJH105775 said:
Was your transmitter also reversed polarity SMA? If you try to put a RP-SMA anteana on an SMA connector you get no connection even though it fits perfect
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I thought the rp referred to the pin being either male or female. I was getting clear video at about 50-60 yards so I'm assuming I had the right antenna lol
 
sma-rpsma.jpg


RP actually stands for reversed polarity, but you were perhaps correct physically.
 
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