[Elecraft] KPA500 - Advantage of min fan speed?

[Michael Walker]

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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