Re: [Elecraft] KPA-500 fan noise

[Richard L Diddams, Sr.]

My comment is not to K6GPW, but to the continuously number of postings
regarding Fan Noise. 

1) Would someone measure (quantify) the "objectionable" noise (using a sound
meter) and report their dB findings.  

2) Determine a sound level (measurement) that is acceptable (based upon
normal ears).  

3) Describe how / where the amplifier is located; possibly the amplifier is
in a position where sound is reverberating off a wall, metal file cabinet,
wooden or plastic shelf, (possibly the amplifier enclosure itself), etc..  

4) What is the noise specification of the fan in the amplifier provided by
the manufacturer - is it being exceeded. 

5) How loud is "too loud" - my ears or your ears?  

6) Is there an industry standard for reference in measuring the KPA500
"noise"?

 

Someone who is/are audio experts can provide a methodology on how to
properly measure (fan) noise.  Baseline fan noise must be measured in an
environment where other artifacts are not influencing (amplifying) the
"real" sound level and away from the operating station to obtain a true
level of the fan noise. The measurement methodology must be capable of being
duplicated by others with results within instrument accuracies.  Next repeat
measurements with the amplifier in the operating position.  At least, at
this time, one would know if there is an increase in "fan" noise level, if
the noise increases, it probably isn't the fan.

 

Possibly a simple solution to those with sensitive ears is placing sound
absorbing material between the wall and amplifier, or a baffle above the
amplifier slanting towards sound absorbing material.  Or lastly, just suck
it up and live with the "noise".

 

It very well could be, the artifact of undesirable fan noise can, only be
resolved by usage of headphones or sell your amplifier - if the price is
right, I'll buy yours!  "hi"

 

BTW, my KPA500 does not have an objectionable fan noise.  I didn't use the
word "loud" or "soft: because I do not know what the definition of "loud" or
"soft" may be!  If I could borrow a noise meter, I'd measure my amplifier
and let everyone what a "desirable" noise level should be!  "hi"

 

Owner of K1, K2, K3, KPA500, KAT500 and several other pieces of Elecraft
products.

 

73, Dick - W7QHE/4

 

===

 

Message: 9

Date: Mon, 02 Jun 2014 08:28:28 -0700

From: Fred Jensen mailto:k6...@foothill.net> >

To: elecraft@mailman.qth.net  

Subject: Re: [Elecraft] KPA-500 fan noise

 

Our "Beverage Central" is located in my shack.  I was contemplating putting
a heat exchanger on the KAP500 PA's and routing cold water from the drink
fridge through it.  I guess that would class as 

"re-engineering?"  Haven't figured out how to get the plumbing out of the
fridge, however.

 

73,

 

Fred K6DGW

- Northern California Contest Club

- CU in the 2014 Cal QSO Party 4-5 Oct 2014

- www.cqp.org  

 

On 6/2/2014 8:16 AM, Jim Brown wrote:

> On 6/2/2014 7:56 AM, AG0N-3055 wrote:

>>> You could always try replacing the fan with a quieter fan.  I would
consider that myself, but only with >>> one recommended by the good people
at Elecraft.

> 

> It is generally a bad idea to try to re-engineer a product, especially one
that is well designed. In this > > > case, I would consider it a really bad
idea.

 

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[Elecraft] Connecting Encoder/Decoder to K3

[Richard L Diddams]

Has anyone connected a Communications Specialist TE-32 type CTCSS Encoder to
the K3 with the 2m option?  

 

If so, how was it connected, i.e. into the circuitry as well as any
necessary modifications.

 

Dick Diddams - W7QHE

dickdiddams at earthlink dot net

K2,  K3 and P3 owner

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