[Elecraft] KPA1500 fan noise concern

[Clay Autery]

I don't have a fancy schmancy degree in acoustic design, but in my 20+ 
years of thermal control design for computing and other electronic 
products, I necessarily dealt with acoustic design as it pertains to 
device chassis.  They are often competing demands.
One of my main selling points to many of my clients was that while 
meeting their requirements for thermal control, I could generally 
improve (reduce) the acoustic stress on their staff.  I had several 
long-term relationships where they kept adding adjunct projects to the 
original contract that were primarily acoustic and only secondarily 
thermal control as a result.

I'd be happy to trade some "free thermal/acoustic" analysis time on the 
KPA-1500 in return for the simple pleasure of having one on the bench 
during the process.  <big grin>
Assuming I can produce a viable/economically feasible solution for both 
the company and customer base, perhaps a deal could be reached on a 
price to avoid returning the "test bed". <bigger grin>

Wayne?  Eric?

73,

______________________
Clay Autery, KY5G
(318) 518-1389

On 05/28/18 15:33, Jim Brown wrote:
> On 5/28/2018 11:24 AM, Ralph Parker wrote:
>> I ordered the '1500 In the quest to be a couple of instant db louder, 
>> but if I don't hear some resolution of the noise 'problem', I'm going 
>> to put the order on hold until it is solved. I do have many headsets 
>> which I usually wear, including the Bose QC15 noise cancelling model, 
>> but I'd hate to be FORCED into using them.
>
> This is exactly one of the many issues that Acoustic Consultants 
> address in the design of buildings that house recording studios, 
> concert halls, and student practice halls in music colleges. I 
> regularly worked with world-class guys in my own consulting practice, 
> which only did sound system design, and I learned just enough to know 
> that I shouldn't try to do their work. :)  There are many elements to 
> the design problem, and the fan itself is only one of them. Other 
> elements I'm aware of is turbulence of air flow, mechanical vibration 
> coupled from the fan to the structure to which it is mounted, where 
> the fan(s) are located, and so on.
>
> I don't know if one of them was involved with Elecraft, but if not, 
> I'd suggest that Elecraft buy some time from one of them. And I'd be 
> happy to provide names of some good people/firms. In the early K3 
> days, I referred a good acoustics guy to Wayne to solve the problem of 
> acoustic coupling between the speaker and the synthesizer that added a 
> sideband to RTTY, and suggested adding the stiffener to that board 
> solved the problem and became a running mod.
>
> 73, Jim K9YC