Hello Ted,
I haven't owned an airplane in years either, 1995 when I sold my BD-4, Darn.....
However, As I grow older and the ears get weaker, having to listen to fan noise
mixed with SSB voice is a concern. I am an engineer of sorts and know that
there are ways to control the noise from fans. Efficient vane design for lower
RPM operation and still produce the required CFM. So what is the dBa of the
1500 at 0-5 levels? My ears like to hear <25 dBa noise. The noise in the
Utube video WAS way above that. NOT good.
Mel, K6KBE
From: "Dauer, Edward" <eda...@law.du.edu>
To: "elecraft@mailman.qth.net" <elecraft@mailman.qth.net>
Sent: Saturday, June 2, 2018 2:15 PM
Subject: [Elecraft] KPA1500 Fan Noise
I have been following this thread with interest because I have a KPA1500 on
order, and I have very limited flexibility as to where the RF deck can go
compared to where I will have to sit.
Don's video was very well done and a great help in understanding the realities.
I know zero about thermodynamics, and so wanted only to say thanks to everyone
who is contributing ideas, and to make but two comments.
First, as to water cooling, I suspect it would be a huge weight penalty to get
the cooling fluid everywhere it needs to be. So far as I know there is only
one reciprocating engine made for aircraft that has a water jacket. (There
might be others nowadays - I haven't owned an airplane for some years.) The
reasons others don't are reliability, safety, complexity, and - mostly -
weight. Second, isn't this largely a contest-operating issue? I believe we
are still governed by the rule that we may use only that amount of power
necessary for the communication. I contest too, so I'll face the problem on
those occasions, but not for casual ragchews. I plan to make some graphs of
when in terms of time, power, mode and band the fans on mine kick up a notch,
and use it as a general operating guideline if I need to.
Ted, KN1CBR
Date: Sat, 2 Jun 2018 08:48:46 -0600
From: Don Butler <n...@comcast.net>
To: Paul Baldock <p...@paulbaldock.com>, "Elecraft@mailman.qth.net"
<Elecraft@mailman.qth.net>
Subject: Re: [Elecraft] KPA1500 Fan Noise Video posted
Message-ID: <mailman.7833.1527966108.9989.elecr...@mailman.qth.net>
Content-Type: text/plain; charset="utf-8"
Paul ?. The PS noise is minimal from my point of view. The power supply
fans do run continuously while the amp is switched on ?. You can hear the PS
fans at the beginning and end of the video when the fan speed is set at ?0? ..
all you?re hearing at that time is the PS fan ? at power down right at the end
you can hear when the PS fans stop.
Don, N5LZ
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