[hpsdr] Pandora Fan

[Jim]

Hi John,

Just a quick question.  At Dayton this year the TAPR booth had an HPSDR set 
up that had a fan in it that had a blue light in it.  Is the Digikey part 
you specified that same fan ?  If not, did that fan work well and could we 
use that one instead ?

Thanks

Jim


----- Original Message ----- 
From: "John Ackermann N8UR" <jra at febo.com>
To: "Jeremy McDermond" <mcdermj at xenotropic.com>
Cc: "HPSDR" <hpsdr at openhpsdr.org>
Sent: Thursday, November 19, 2009 1:44 PM
Subject: Re: [hpsdr] Pandora Fan


> ***** High Performance Software Defined Radio Discussion List *****
>
> Jeremy McDermond wrote:
>
>> The one comment/question I had during the process is why a 90mm fan was 
>> chosen for Pandora.  Since the common PC fan sizes are 80mm and 120mm, it 
>> would seem as if it would have been nice to have either one of those 
>> sizes in there.  It would make getting some of the fans easier.  As it 
>> was, I drilled out some holes for an 80mm fan instead and it doesn't look 
>> bad at all.  I used an Enermax temperature controlled fan, and put the 
>> temp probe between the LPU heatsinks.  It's really quiet, and I'm happy 
>> with it so far.  We'll see how it performs when I get a 
>> Penny/Pennywhistle in there to really pull some current through the LPU. 
>> If there's ever a Pandora II, one might want to look into putting spaces 
>> for a couple of 80mm fans in there instead of a single 90mm.
>
> Simple answer... it was a suboptimal decision on the designer's (my) part!
>
> When we spec'd the fan, we wanted to use the largest size that reasonably 
> fit in the space available, and 92mm (note, not 90mm), with holes spaced 
> 3.25 inches, seemed like a good match.  We didn't think that the 80mm PC 
> fans would be more available, and isn't *that* much smaller.
>
> I'm using Digi-Key part number P11043-ND which when last I looked was 
> reasonably priced at $8.75.  One downside with that particular part number 
> is that it doesn't come with the 3-pin connector on the leads; I haven't 
> had a chance to check whether there's another model that has the connector 
> pre-installed.
>
> John
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