[Milsurplus] GRC109/R-1004A arrived!

[John Hutchins]

All -
Black heat sinks seem to dissipate, distribute, suck off, more heat from 
the device; when looking at the heat sink specifications.
I believe units painted  the Black in WW2/Korea/Viet Nam was:
  1. cheap paint.
  2. for light, reflection, glint, abatement
Now I could be wrong.... being anything with a tube ran hot anyway.
Hutch


On 9/14/2011 9:23 AM, bcarling at cfl.rr.com wrote:
> Every piece of solid state power equipment I have ever used with a heat sink has it colored black. With a few exceptions for on painted aluminum surfaces, that is about it. Engineers have used this technique for about 40 years or more. No they usually do not run hot enough to melt solder.
>   I am fairly sure that the engineers who painted the grc109 boxes black did so for a reason.
>
> Sent from myTouch 4G
>
> ----- Reply message -----
> From: "J. Forster"<jfor at quikus.com>
> To:<bcarling at cfl.rr.com>
> Cc:<milsurplus at mailman.qth.net>
> Subject: [Milsurplus] GRC109/R-1004A arrived!
> Date: Wed, Sep 14, 2011 9:41 am
>
>
> Painting the heatsink black is essentially pointless. Unless the heatsink
> operates at high temperature...  think melting solder at least...
> radiative transfer is insignificant.
>
> -John
>
> ===============
>
>> Interesting thoughts Richard...
>>
>> I have never heard any amateur say that his GRC109 failed due to
>> overheating...
>>
>> Also note that the case is a giant heatsink and painted black which is the
>> best color for
>> re-radiation of heat to the outside. Now maybe if you used it for 8
>> straight hours at field
>> day here in FLORIDA, you could overheat it! Now there is an idea for an
>> experiment and
>> a magazine article.,.... NAH!
>>
>> On 13 Sep 2011 at 20:18, Richard Brunner wrote:
>>
>>> Another thing: Military communications must be infrequent and
>>> brief,
>>> because most mil equipment is boxed up tightly with little concern
>>> about
>>> heating, and the GRC-109 is no exception.  The transmitter would
>>> have to
>>> be taken out of the box to survive amateur operation.
>>>
>>> Richard, AA1P
>>
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>
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