[hpsdr] Pandora Fan Orientation?

[Albertson Chris]

The purpose of a fan is to exhaust the hot air and thereby reduce the  
ambient temperature of the inside of a chassis.
You would see these exhaust fans mounted near the top of the enclosure.
If you have a specific heat sink that needs cooling it's best to mount  
a small fan directly to that one heat sink.

The fan will move more air if the side blowing is unobstructed



On Jul 11, 2009, at 9:59 AM, John Ackermann N8UR wrote:

> ***** High Performance Software Defined Radio Discussion List *****
>
> We haven't done any serious testing on airflow, but it intuitively  
> seems the right thing is to have air blowing into the cabinet, so  
> that it's directly hitting the LPU heatsinks.  However, intuition  
> isn't always correct, so it would be interesting to hear from anyone  
> who really knows this stuff.
>
> John
> ----
>
> n3evl said the following on 07/11/2009 12:08 PM:
>> ***** High Performance Software Defined Radio Discussion List *****
>> I have my fan mounted in Pandora and noticed that it is mounted  
>> such that it blows air out of the cabinet.  I'm guessing it needs  
>> to draw air into the cabinet and needs to be turned around?
>> BTW, LPU is complete and operational.  I mounted the two 6.8ohm 10w  
>> resistors in parallel instead of the single 2.2ohm - voltages all  
>> look good.  Thanks again to those that shared their photos of the  
>> constructed board.
>> Pete, N3EVL
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