How Hot is my NIM?
How Hot is my NIM?
It has taken me a while since buying the MiniTiouner hardware and I have now completed it. Proving it works by connecting it to the FreeSAT dish and it works but I am surprised at how hot the NIM is. So I checked the 4 Volt and all is well but the regulator is a very warm, so I upgraded the module to a 3A version and again it works, the regulator is now only warm but the NIM cannot be touched for long before being uncomfortable.
I am looking for clues where to go next as it could be "normal" ....?
Thank you
David
I am looking for clues where to go next as it could be "normal" ....?
Thank you
David
Re: How Hot is my NIM?
Hello,
Using an infrared thermometer, after several hours of work, my NIM shows a temperature of 28°C at the beginning of the metal box, 33°C in the middle, max temp is at the lower end, bottom : 41°C.
Touching it continuously seems to me lukewarm.
Nim is used with a MiniTiounerPro.
Jean-Pierre F6DZP
Using an infrared thermometer, after several hours of work, my NIM shows a temperature of 28°C at the beginning of the metal box, 33°C in the middle, max temp is at the lower end, bottom : 41°C.
Touching it continuously seems to me lukewarm.
Nim is used with a MiniTiounerPro.
Jean-Pierre F6DZP
Re: How Hot is my NIM?
Maybe you are receiving freesat with it? It probably takes a lot more power to process 27.5MBs than normal amateur use. Suggest you try it on the beacon and see what happens.
Mike
Mike
Re: How Hot is my NIM?
Hi,
My Mt also reaches 41 degrees centigrade on the nim and the 1.1 volts regulator, same values in the new MT pro board. I added a Heat Sink to the regulator.
My Mt also reaches 41 degrees centigrade on the nim and the 1.1 volts regulator, same values in the new MT pro board. I added a Heat Sink to the regulator.
Re: How Hot is my NIM?
Thank you, I have ordered a IR thermometer and will add a heatsink to the regulator this weekend. Then I will try something other than freesat once I learn how. This is my first adventure in to SAT so a interesting learning curve.
Re: How Hot is my NIM?
I seem to remember a previous post regarding the NIM running hot. I think it was due to a manufacturing fault with lots of solder blobs on the board. Try a search of older posts and you might find the answer.
Re: How Hot is my NIM?
Found it.
The initial post wasn’t specifically about the temperature but
The high temperature was noted as one of the symptoms.
Have a look at this post.
viewtopic.php?p=19661#p19661
The initial post wasn’t specifically about the temperature but
The high temperature was noted as one of the symptoms.
Have a look at this post.
viewtopic.php?p=19661#p19661
Re: How Hot is my NIM?
I will repeat what I said - using the minitioune to receive broadcasts at 22MBs and 27.5MBs will make it run hotter than normal because these modes require more processing power to demodulate, especially if the DVB-S2 error correction has to work hard. The 1.1V regulator and NIM will be dissipating more heat. That's normal. Don't assume it is faulty. If it gets very hot receiving the QO-100 beacon - that's not normal.
From the NIM data sheet for the FTS-4335 Series the operating temperature is up to 70C.
Maximum currents with both tuners active are:
3.3VT 640mA - this is the tuner without LNA. The newer tuners with LNA will need more, but I have never seen mine require 640mA.
1. DVB-S and DTV Legacy:
- 3.3VD: 30 mA(Typ.), 40 mA(Max.)
- 1.1VD: 145 mA(Typ.), 205mA(Max.)-> 2 Port DVB-S Active
2. DVB-S2:
- 3.3VD: 30 mA(Typ.), 40 mA(Max.)
- 1.1VD: 315 mA(Typ.), 400 mA(Max)-> 2 Port DVB-S Active
With only one tuner active, it is less but we may need to consider heatsinking for the 1.1V regulator when using both tuners. Running off 5V USB power as some have done will be more of a challenge as around 1.1A could be required. That's why I didn't do that.
When we come to use both tuners in DVB-S2 at high symbol rates we might be looking at up to 700mA at 3.3V and 400mA at 1.1V. The NIM will be dissipating 2.7W and will get hot. Normal DATV use much less.
Mike
From the NIM data sheet for the FTS-4335 Series the operating temperature is up to 70C.
Maximum currents with both tuners active are:
3.3VT 640mA - this is the tuner without LNA. The newer tuners with LNA will need more, but I have never seen mine require 640mA.
1. DVB-S and DTV Legacy:
- 3.3VD: 30 mA(Typ.), 40 mA(Max.)
- 1.1VD: 145 mA(Typ.), 205mA(Max.)-> 2 Port DVB-S Active
2. DVB-S2:
- 3.3VD: 30 mA(Typ.), 40 mA(Max.)
- 1.1VD: 315 mA(Typ.), 400 mA(Max)-> 2 Port DVB-S Active
With only one tuner active, it is less but we may need to consider heatsinking for the 1.1V regulator when using both tuners. Running off 5V USB power as some have done will be more of a challenge as around 1.1A could be required. That's why I didn't do that.
When we come to use both tuners in DVB-S2 at high symbol rates we might be looking at up to 700mA at 3.3V and 400mA at 1.1V. The NIM will be dissipating 2.7W and will get hot. Normal DATV use much less.
Mike
Re: How Hot is my NIM?
Hi,
on the picture you can see the hot spots around the regulator, the NIM is about 33°C.
Reinhard
on the picture you can see the hot spots around the regulator, the NIM is about 33°C.
Reinhard
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- TempTiouner.jpg (114.67 KiB) Viewed 5720 times
Re: How Hot is my NIM?
Nice thermal image. Might try that mtself. Unfortunately may not be accurate on the nim as the emmissivity of the metal can will be low - the true NIM temp in your image is nearer to top scale from what you see through the holes, but it's a whopping 43C. I don't think we will have to call out the fire brigade.
Meanwhile here is a nano and a cup of tepid coffee for comparison. Mike
Meanwhile here is a nano and a cup of tepid coffee for comparison. Mike