[Elecraft] KPA-1500 fan speeds and fan noise

[Clay Autery]

Are they 80 or 92mm fans?

You are correct....  You can realize the same volume of air delivery at 
lower noise levels by running 2 or more fans slower. Increasing the 
intake area for the same volume of flow reduces pressure, turbulence, 
noise... lots of cool stuff.  :)

I'm  not sure what the hardware circuit looks like and how much 
flexibility they have for controlling the fans, but this would be one 
way to stave off the noise for a while...

______________________
Clay Autery, KY5G
(318) 518-1389

On 05/20/18 18:12, Dick via Elecraft wrote:
> I think the KPA-1500 is a very nice amplifier and am happy to won one.  That said, I'd like to see Elecraft find ways to reduce the fan noise, and I believe there are solutions, such as: in "Fan 1" mode: rather than have Fan 1 turn on at full speed with full noise, I'd much prefer to have all 3 fans turn on and run at 1/3 speed as the noise should be reduced while the air flow would be about the same.  When the 3 similarly sized fans on my Yaesu Quadra run at slow speed while the amp is in stand-by or receive mode they are pretty quiet and only generate about the same amount of noise as many desktop computers, and when the Quadra is transmitting the fans go to high speed and produce about the same amount of noise as the KPA-1500 when it's running in the "Fan 2" position.  I imagine Fan positions 3-4-5 are needed because the heat sink in the KPA-1500 is relatively small because the physical size of the amp is small?
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> 73,
> Dick- K9OM
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