[time-nuts] HP5370 power supply measurements

Clay Autery cautery at montac.com
Fri Jul 15 16:17:28 EDT 2016

Actually, the lion's share of noise heard from a fan is NOT the moving
air, but the turbulence over the fan blades... This is a VERY large
topic that I don't want to bore the list with.

Clay Autery, KY5G
MONTAC Enterprises
(318) 518-1389

On 7/15/2016 8:17 AM, Dr. David Kirkby (Kirkby Microwave Ltd) wrote:
> I often here of people replacing fans with quiter ones, but I suspect that
> all they really do is reduce the airflow. I believe that most of the noise
> one hears is the movement of the air.  From what I have read, sleve bearing
> fans make a bit less noise than ball bearings fans.  However,  although the
> MTBF of both types is similar at 20 degree C, the MTBF of sleve bearing
> fans decreases quite a bit with only a modest increase in temperature.
> Dave.

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