[Elecraft] K3 KPA3 Fan Upgrade Question

[Dave Hachadorian]

With stock fans, you shouldn't see more than about 64C on 
the PA TEMP reading (with 77F room air). The high temp 
warning, with KPA bypass, is set for 84C, so there is quite 
a bit of headroom.

If you really want to use your new fans, you could set 
config: kpa3 = Fn2. With that setting, the fans will never 
run at less than speed 2, but will speed up at the 
appropriate temp as the PA warms up.

Dave Hachadorian, K6LL
Yuma, AZ

----- Original Message ----- 
From: "Brian Binkley" <kd8cpf at gmail.com>
To: <elecraft at mailman.qth.net>
Sent: Wednesday, May 13, 2009 12:11 PM
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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