[Elecraft] KPA500 - Advantage of min fan speed?

[Mike Maloney]

 Thanks Mike for the KPA-500 fan level settings.  That answers the question I was going to ask.   Could find no fan level info in the owners manual or from previous posts.I don't suppose any record kept of SPL  readings at the different levels?   Anyone done that?  
73, Mike AC5P

    On Sunday, September 29, 2019, 10:08:41 PM CDT, Michael Walker <va3mw at portcredit.net> wrote:  
 
 Here are the thresholds 


level 1: 50 degrees 
level 2: 55 degrees
level 3: 60 degrees
level 4: 65 degrees
level 5: 70 degrees
level 6: 80 degrees

if the temperature gets above 90 degrees we throw a fault and drop into standby (with fault showing).

Mike va3mw

> On Sep 29, 2019, at 10:38 PM, Andy Durbin <a.durbin at msn.com> wrote:
> 
> The KPA500 offers a minimum fan speed setting which is settable by menu or serial command.  Some posters have advocated setting a minimum fan speed higher than zero, presumably thinking it offers some advantage in thermal management.
> 
> Does anyone have any hard data that shows that the KPA500 runs cooler, or with lower peak fan speed, when minimum fan speed is set above zero.
> 
> Running a rigorous test may not be easy since it would seem to require the same ambient temperature, same finals starting temperature, same TX periods, and same antenna system load.
> 
> I'm curious because, before CQ-WW-RTTY I configured my KPA500 to set min fan speed to 1 at start of TX and reset min speed to zero 30 seconds after stop of TX.  Of course the fans ran faster than min speed during TX but I don't have any feel for whether the higher speeds were any more protracted than before the min speed change.
> 
> Please share you experience of using min fan speed greater than zero, and any data if you have it.
> 
> 73,
> Andy, k3wyc
> 
> 
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