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

[Matt Ettus]

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


> -----Original Message-----
> From: Richard Meston [mailto:address@hidden
> Sent: Thursday, November 16, 2006 09:19 AM
> To: address@hidden
> Subject: FW: [Discuss-gnuradio] Re: Enclosure Fan connection
> 
> Matt
> 
> This post is the first I'd heard of a fan being required - have you
> found that the FPGA gets a bit hot?
> 
> I've got a r4.1 board which doesn't seem to have a fan connector - what
> revision was it introduced in?
> 
> Rich
> 
> 
> -----Original Message-----
> From: address@hidden
> [mailto:address@hidden On
> Behalf Of Matt Ettus
> Sent: 16 November 2006 04:55
> To: Bill Tracey
> Cc: gnuradio mailing list
> Subject: [Discuss-gnuradio] Re: Enclosure Fan connection
> 
> 
> > Hello -- do you have any suggestions for wiring the enclosure fan with
> > a "Gnuradio Rev 3" USRP board (s/n 356. 9/11/05).  Fan appears to be a
> > 5v part - not clear from the pictures on the web where it's connected
> > to.  Tap off the USB connector on the underside of the board?
> 
> The USRP boards shipping now have a fan connector.  For older boards
> which don't, you'll need to do the following:
> 
> 1 - cut off the fan connector
> 2 - solder the black wire to a ground point.  Suitable choices are the
> ground connector on the lower left of the board, and the ground pin on
> the power connector (the one on the side).
> 3 - solder the red wire to a power supply.   The best place to do this
> is on the output pin of the power supply connector.
> 
> The fan is labeled 5V, but it is spec'ed from 4-7V, so it works fine on
> the 6.3V which the above would get you.  It will be a little extra
> noisy.  If that bothers you, you can put a 10 ohm resistor or a diode in
> the power line to drop the speed.
> 
> Matt
> 
> 
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