Re: [Discuss-gnuradio] Re: Enclosure Fan connection

[Marcus Leech]

Matt Ettus wrote:
> The FPGA does not get hot.
>
> The only chip that gets hot enough to warrant the fan is the power supply, and 
> only when in the enclosure.  The enclosure has the fan directly adjacent to the 
> power supply chip.
>
> When using the board without an enclosure, the fan is not needed.
>
> Matt
>
>   
I use an early-rev USRP in a thermally-controlled environment.   The 
USRP is inside an old SCSI disk
 cabinet, with a switched PC-style power supply providing power.  
There's a fan in that enclosure.

This whole thing lives inside a styrofoam cooler, surrounded by thermal 
mass (a slab of aluminum, and
 a bunch of gel-packs).

The equilibrium temperature of this setup hovers around 35C--I have a 
temperature probe attached to
 the aluminum thermal mass under the SCSI enclosure.    That's not 
particularly hot.