[Elecraft] KPA1500 Power Supply Fan Noise

[Jim Brown]

On 6/11/2019 12:20 AM, turnbull wrote:
> Eric, I do not understand your problem with the PS and audible noise.    The larger fans in my KPA1500 are quiet.   Any noise is at low freq.

Do you work keydown modes at high duty cycles, like RTTY contesting or 
WSJT-X modes where high power is needed (6M, 160M, for example)?  If you 
do a lot of meteor scatter or FT8 or moonbounce, especially on 6M where 
the efficiency is lowest, it doesn't take long for the fans to scream. 
And that's because they are small, which they must be to fit in the 
height dimension of the power amp.

73, Jim K9YC