[Elecraft] KXPA100 Thermal Fault

[David Cole]

Fans are always good...  I saw someone selling a thermostatically
controlled fan for 70 bucks recently...  Built for whatever you want to
use it on.  I wish I knew where he got his thermostat from...  I would
build it myself...  Can't bring myself to spend 70 bucks on a fan.
-- 
Thanks and 73's,
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On Sun, 2014-07-20 at 16:54 -0700, george fritkin via Elecraft wrote:
> Why not run it at 50 watts and give up the 3db.  Probably will not make a difference in number of contacts and your thermal problem should go away.  Also what is SWR
>  
> George, W6GF 
> 
> 
> On Sunday, July 20, 2014 4:23 PM, Bert via Elecraft <elecraft at mailman.qth.net> wrote:
>   
> 
> 
> I used my KX3/KXPA100 in the NAQP RTTY contest this weekend. The KX3 with  
> added-on heat sink worked very well; however, the KXPA100 repeatedly faulted 
> with HI TEMPERATURE indicated on the KX3 at full output after prolonged  
> operating (lots of CQ'ing with short pause intervals). PA.X temp indicated at 
> failure was around 60C...as it should. Shack temperature was around 70 
> degrees  F
> Yes, I know all about digital modes and full power stressing amplifiers,  
> etc. What I want to know is how to mitigate this interruption yet run full  
> output. To that end, I have a couple ideas: what if I mounted the amp 
> vertically  so the heatsink fins "drew" cooler air through themselves via 
> convection?  Secondly, would a couple muffin fans mounted atop the cooling fins do 
> the job? 
> The net of this is that I'd like to enjoy the full benefit of having a  
> high-quality 100-Watt amplifier, regardless of mode or key-down time.
> 
> Bert N4CW/K1IMI
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