Eric,
My shack is a relatively quiet operating environment, but declaring
something as quiet or noisy is always somewhat subjective. The fans in
my PSU are pretty quiet, but nevertheless the KPA1500 PSU is
remote-installed in a closet in my shack.
I am absolutely no "audio" guy, but years ago installed a free, cheap &
dirty noise level meter app on my android phone called "Sound Meter." I
use it to complain to restaurant managers that the blaring music in
their establishments is too loud for casual conversation, demanding that
it be turned down.
With the KPA1500 turned off and phone situated 3 feet from the power
supply, the noise level in that closet is 28 DB. Turning on the
amplifier raises the noise level by 12 DB to 40 DB - a 12 DB difference.
Not much difference, and certainly not the "piercing power supply fan
noise" you describe.
-larry (K8UT)
------ Original Message ------
From: "eric norris via Elecraft" <elecraft@mailman.qth.net>
To: "li...@w2irt.net" <li...@w2irt.net>; "li...@w2irt.net"
<li...@w2irt.net>; "Elecraft Reflector" <elecraft@mailman.qth.net>
Sent: 2019-06-10 19:57:02
Subject: [Elecraft] KPA1500 Power Supply Fan Noise
More broadly, has there been any progress on reducing the piercing power supply
fan noise on the KPA1500 when only using it as a tuner or an antenna switch? I
complained about this a year ago, and I find it completely unacceptable. No
set of noise-reducing headphones that I have tried works well enough to make
the noise tolerable. I've tried moving the PS deck around with minimal
improvement. This just doesn't seem to fit Elecraft's philosophy of a quiet
operating environment. Why do these fans have to operate at full throttle when
there is minimal current draw from the rf deck? Why do these fans create such
a piercing high-pitched note?
If there is no response from Elecraft, what have other ops done--short of
moving the PS into an adjoining room--to mitigate the scream?
Thanks,
73 Eric WD6DBM
Sent from Yahoo Mail on Android
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