[hpsdr] Pandora Fan

[John Ackermann N8UR]

No, the "blue light special" fan at Hamvention was a different size unit 
that was held in place with one or two screws and a tie-wrap, if I 
remember correctly.  So, that model is not recommended. :-)

It was the only fan we could find at Hamvention within a reasonable 
radius of our space.  (The painted Pandora prototypes were 
hand-delivered to us by the manufacturer at Hara, so we had to build the 
systems at the booth.)

John
----

Jim wrote:
> 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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