[Elecraft] K3 KPA3 Fan Upgrade Question

[Ed Muns]

You're doing what?!

For two years I've run my K3s in NAQP at 100 watts with high duty cycle.  The fans seldom turn-on and the PA is barely warm.  If you can out-design N6KR, I'd be amazed.

Ed - W0YK


------Original Message------
From: Brian Binkley
Sender: elecraft-bounces at mailman.qth.net
To: elecraft at mailman.qth.net
Sent: May 13, 2009 07:11
Subject: [Elecraft] K3 KPA3 Fan Upgrade Question

Hello,

I am currently in the process of upgrading the fans for the KPA3 100 Watt
Amplifier module because the heatsink temperature gets too high for my
liking. I am upgrading both fans to a fan with higher CFM output. Last night
I hooked both fans up to the KPAIO module to test and see if they will work.
When I am on fan power level one, the fans try to but are unable to start
up. I have to bump them to start them spinning. Power level two has no
problem spinning them up. When I went to power level four and then brought
the power level to one, the fans did not have any problem continuing
running. The fan specs can be found here
http://www.sundialmicro.com/ipcqueen_dc_fan_606010_ball_bearing_3pin_2033_1199.html.
Is there any components that I can add in line to provide the necessary
power to start the fans up at power level one?


Thanks
Brian Binkley
KD8CPF
KD8CPF at gmail.com
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