Exactly right, Clay. It is, indeed, a matter of compromise between cost
and how many customers care about whatever the characteristic you're
trying to optimize. At least 90% (and 100% of my serious operation) is
wearing headphones, and the times I'm using the speaker I'm monitoring
while in the shack doing something else. So I've NEVER been bothered by
the fans in my K3/100.
I DO hear the fan in my KPA500 when I push the TX duty cycle, so I've
guessing that a few bucks spent on making it quieter without
compromising cooling would be appreciated by a much higher percentage of
users.
73, Jim K9YC
On Wed,2/3/2016 1:51 PM, Clay Autery wrote:
Well, there are laws of economics for manufacturers, too. And they are
at times more rigid than those in physics. <grin>
Yes, I've been doing thermal design for 25 years. You give me a big
enough pile of money, I'll deliver your target temp at target location,
with </= max specified "noise".
73,
______________________
Clay Autery
On 2/3/2016 3:43 PM, Lynn W. Taylor, WB6UUT wrote:
So, what is noise? It's energy.
Some of it goes into the fan and moves air, some is from turbulence
off the blades, and some heats the bearing.
There are quieter fans that still move lots of air. They have
carefully shaped blades and all of the flashing is cleaned off so the
edges are smooth. Extra steps that cost more.
I've replaced a lot of computer fans. If the computer sits next to
me, I get quiet ones. If it's in a server closet, I use higher-speed,
noisy fans, preferably ones with a very high MTBF, because I won't be
there to hear the server get quiet.
73 -- Lynn
On 2/3/2016 1:26 PM, Clay Autery wrote:
You can BEND the laws of physics, but you can't break them. Within the
package size dictated, you can only move so much air in a given
timeframe, "silently".
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