[arm-allstar] CPU Temp

[David]

Thanks for the info. We ran across a 200 foot tower, with good coax, and functional antenna. It's a location of one of the assets customers for nctc. We will have to except the environment and love that they are letting us use it.
https://www.google.com/maps/d/viewer?mid=1ZccJlJJfE7XxKzJSxHqF-GRU6Y0&shorturl=1&ll=32.60756759082941%2C-97.11502074999999&z=7
-------- Original message --------From: Doug Crompton <wa3dsp at gmail.com> Date: 7/19/18  12:56 AM  (GMT-06:00) To: David <david at kg5rdf.com>, ARM Allstar <arm-allstar at hamvoip.org> Subject: Re: [arm-allstar] CPU Temp 
Dave,
Glad to hear everything is going well.

For what its worth the green is 40C range, Yellow 50C range and red 60C range. Actually these are rather conservative and arbitrary ranges. All my Pi's run in less than 80F ambient and even running turbo mode remain in the mid to low 40C range. 

If you don't have one you should look into an attic fan. That is a pretty nasty place to put a repeater. You couldn't get in below the attic?
73 Doug
WA3DSP
http://www.crompton.com/hamradio





On Wed, Jul 18, 2018 at 11:10 PM, David <david at kg5rdf.com> wrote:
Doug,
Thanks, yes CPU Stats were green. It's been 4 decades since I did Newtons law on cooling:) I guessed at the temperature for the environment. When I measured it, it was 115f. Temp here has gone up 9 degrees. Lets assume the temp is at least 120f+. I must be getting some cooling over ambient. What is the trigger for yellow and red temp? The ambient temperature will be 3 degrees higher tomorrow.
The complete repeater system is in an attic at 4 foot clearance.  I agree, a spare pi is the answer. Not much more can be done on cooling. When we left, after six hour install, I said the pi will burn up first and dropped the repeater to medium power:)
I want to thank you and David for the great work. The DNS is working great. We are also vary pleased with the conversion to private node.
Thanks again David
-------- Original message --------From: Doug Crompton via arm-allstar <arm-allstar at hamvoip.org> Date: 7/18/18  9:02 PM  (GMT-06:00) To: ARM Allstar <arm-allstar at hamvoip.org> Cc: Doug Crompton <wa3dsp at gmail.com> Subject: Re: [arm-allstar] CPU Temp 
David,

  120F is not a seriously bad CPU temperature. That is 48C and well within
tolerance. It would show green in the cpu_stats. So you should be OK. I
would say most Pi CPU's without fans could run in that range and certainly
those without heat sinks. It is always a good idea to keep things as cool
as possible but the loss of a Pi if it were to come to that is not a big
cash outlay. Have a spare on hand if it is a critical application.

I was curious that you  said the environment was 125F and the Pi measured
120F. It would seem that if you are pushing around 125F air the CPU could
not be cooler. Perhaps you should ventilate the area better. Was it that
hot outside?


*73 Doug*

*WA3DSP*

*http://www.crompton.com/hamradio <http://www.crompton.com/hamradio>*


On Wed, Jul 18, 2018 at 9:49 PM, "David via arm-allstar" <
arm-allstar at hamvoip.org> wrote:

>
>
>
> We have one site that is a hot box. CPU temperature is 120f. Environment
> is easy 125f today. It has a fan and heat sinks. Am I looking for a melt
> down or is CPU temp within tolerance.
> 3705 key ups, 77 hours, and all good on private node.
>
> Thanks DAVID KG5RDF
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