Ronnie - I sent the email quoted below to Elecraft Support on Mar 30 - have not
received a reply so far-
Hi - hope all is well with the folks at Elecraft. I haven't spent much time on
10M since receiving the KPA1500 in late 2018. Recently, I was working a small
opening on 10 in the FT8 mode. I
in via an antenna connected to number two, it
should drop when power to the amp is turned off.
Ted, KN1CBR
--
Message: 6
Date: Fri, 8 May 2020 19:28:24 -0500
From:
To:
Subject: [Elecraft] KPA1500 and noise
Message-ID: <362C6C03ECC34C00992DDFCC51D05C03@MININTMC1H
--
Message: 6
Date: Fri, 8 May 2020 19:28:24 -0500
From:
To:
Subject: [Elecraft] KPA1500 and noise
Message-ID: <362C6C03ECC34C00992DDFCC51D05C03@MININTMC1HLDC>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Recently I hav
---
> From: Dave
> Sent: Saturday, 9 May 2020 10:43 AM
> To: Peter Hall
> Cc: w5...@comcast.net; Elecraft@mailman.qth.net
> Subject: Re: [Elecraft] KPA1500 and noise
>
> Mine had noise on 80 meters. Elecraft sent me a load resistor to install in
> the power supply acr
, Peter.
-Original Message-
From: Dave
Sent: Saturday, 9 May 2020 10:43 AM
To: Peter Hall
Cc: w5...@comcast.net; Elecraft@mailman.qth.net
Subject: Re: [Elecraft] KPA1500 and noise
Mine had noise on 80 meters. Elecraft sent me a load resistor to install in the
power supply across the 50 VDC
On 5/8/2020 5:28 PM, w5...@comcast.net wrote:
I turned the Amp back on and the noise came back.
Is your station properly bonded? It should be, for a lot of reasons,
especially noise and safety. It's also the LAW! Study this tutorial.
http://k9yc.com/GroundingAndAudio.pdf
On 5/8/2020 5:41
qth.net On
> Behalf Of w5...@comcast.net
> Sent: Saturday, 9 May 2020 8:41 AM
> To: rocke...@gmail.com; Elecraft@mailman.qth.net
> Subject: Re: [Elecraft] KPA1500 and noise
>
> only one antenna hooked to it, and that’s a sommer XP808 log fed yagi. No
> switches.!
>
> Ro
erate" but nothing discernible elsewhere.
73, Peter.
-Original Message-
From: elecraft-boun...@mailman.qth.net On
Behalf Of w5...@comcast.net
Sent: Saturday, 9 May 2020 8:41 AM
To: rocke...@gmail.com; Elecraft@mailman.qth.net
Subject: Re: [Elecraft] KPA1500 and noise
only one ante
Hi Ronnie
I do not have a KPA1500 (only a KPA500) but I recall seeing posts from time
to time about noise emanating from KPA1500's.
I think you will need to check in with Elecraft on the issue.
73
Barry VK2BJ
On Sat, 9 May 2020 at 10:28, wrote:
> Recently I have noticed that I have a very
only one antenna hooked to it, and that’s a sommer XP808 log fed yagi. No
switches.!
Ronnie W5SUM
-Original Message-
From: rocke...@gmail.com
Sent: Friday, May 08, 2020 7:35 PM
To: w5...@comcast.net ; Elecraft@mailman.qth.net
Subject: RE: [Elecraft] KPA1500 and noise
Need more
@mailman.qth.net
Subject: [Elecraft] KPA1500 and noise
Recently I have noticed that I have a very high noise lever at my QTH, which
I have never had. Today as I was shutting down my station I turned off the
KPA1500 first, and my noise dropped from S7 to S1 instantly.
I turned the Amp back
Recently I have noticed that I have a very high noise lever at my QTH, which
I have never had. Today as I was shutting down my station I turned off the
KPA1500 first, and my noise dropped from S7 to S1 instantly.
I turned the Amp back on and the noise came back. Have any of you ever
Just get a weekly delivery of a large container of liquid nitrogen and rig
up a way to spray it on the heatsinks... It can be very quiet, it has a
large temperature difference, so it will be efficient, and it may drive the
chips into superconducting status which will further improve the
Frankly I agree with Bob-K4TAX:
If you ever have chance to visit the sound booth at either a
broadcast station or recording studio, note the use of acoustic tile.
The Super-Contest station of KL7RA (sk) is lined with acoustic tile
and you note immediately how quiet the room sounds (even with
. This must mean STOP!
"Dave, Dave. What are you doing Dave?"
73, Will, wj9b
CWops #1085
CWA Advisor levels II and III
http://cwops.org/
On Tue, 6/5/18, Walter Underwood wrote:
Subject: Re: [Elecraft] KPA1500 Fan Noise - Not An Issue
To:
I would recommend reading the specs. As I remember, it is ICAS, five minutes
on, five minutes off. But you should check for yourself.
wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)
> On Jun 4, 2018, at 5:06 PM, Paul Baldock wrote:
>
> Can the KPA1500 run brick
Sent: Monday, June 4, 2018 4:19 PM
Subject: Re: [Elecraft] KPA1500 Fan Noise - Not An Issue
That's fine if cost is no object. Acoustics is part of the problem --
ignore it at your peril. :)
73, Jim K9YC
On 6/4/2018 3:06 PM, Mel Farrer via Elecraft wrote:
> While I appreciate all of the so
Can the KPA1500 run brick down 100% duty cycle at 1500W while
maintaining the temperature in a safe range? Anybody tried it?
- Paul
__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help:
A properly damped acoustic environment will enhance the SSB voice on the
air. While a poor acoustic environment will sound like crap, and no
amount of EQ , processing or microphone will correct the undesirable
artifacts. Give some thoughts to improving your radio room
acoustics. Even a
That's fine if cost is no object. Acoustics is part of the problem --
ignore it at your peril. :)
73, Jim K9YC
On 6/4/2018 3:06 PM, Mel Farrer via Elecraft wrote:
While I appreciate all of the sound proofing suggestions, the old rule keeps coming
back.: " Stop the source as much possible
While I appreciate all of the sound proofing suggestions, the old rule keeps
coming back.: " Stop the source as much possible FIRST." I hate patches..
Mel, K6KBE
From: Bob McGraw K4TAX
To: elecraft@mailman.qth.net
Sent: Monday, June 4, 2018 2:20 PM
Subject: Re: [Elecraf
One of my favorite methods of sound treatment is the products in the
link following: http://www.sonex-online.com/Pro%20Audio.htm
There are many other products, and many individuals use their own
creative means to be effective in sound absorption.
73
Bob, K4TAX
On 6/4/2018 1:00 PM, Jim
On 6/4/2018 8:34 AM, Bob McGraw K4TAX wrote:
Room acoustics play a big part of the "how loud" factor. Absorptive
materials applied to the walls an ceiling of a room, specially small
rooms, do reduce the build up of sound / noise emitted from fans and
blowers.
YES! This is excellent advice.
Roughly speaking, both an i7 CPU and a GTX 1070 GPU have power
dissipation ratings 150 watts or less, making them each about an order
of magnitude less than the likely dissipation in the KPA1500. I actually
do like the idea of liquid cooling since it's efficient and flexible if
designed
Room acoustics play a big part of the "how loud" factor. Absorptive
materials applied to the walls an ceiling of a room, specially small
rooms, do reduce the build up of sound / noise emitted from fans and
blowers.
73
Bob, K4TAX
On 6/4/2018 10:04 AM, Richard Thorne wrote:
Don,
Thanks
Don,
Thanks for the updated information. It's quite helpful.
For those of you that don't think that fan noise is a potential problem,
you need to understand my point of view on this.
I've tried very hard to get a good clean noise free signal to my speaker
or head phones.. This starts with
Well said, Don, and I agree. Its not an issue with me either. Even though
its my first solid state amp I realize the need to cool it. They're already up
to suggestingwater cooling. I think we need to talk about hydrogen cooling,
something the radio room on the Enterprise from Star Trek
-
From: elecraft-boun...@mailman.qth.net On
Behalf Of Don Butler
Sent: Sunday, June 3, 2018 6:33 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] KPA1500 Fan Noise - Not An Issue
A post this afternoon refered to KPA1500 fan noise as an "issue" that might
need to be addressed. I
A post this afternoon refered to KPA1500 fan noise as an "issue" that might
need to be addressed. I personally think that is an unfair suggestion.
Fan noise with this amplifier is NOT an issue to me. I have made previous
comments and have also posted a video on this thread, and if I have given
"Water cooling" has come a LONG way from the days back in the 90s when
we were machining out own water blocks from aluminum and copper, and
trying to construct flow loops that didn't leak, find suitable
radiators, etc.
But I don't think there are any current CPU/GPU coolers on the market
There are liquid cooling systems available for CPUs and graphics cards,
used by gamers and overclockers. Have no idea how this would compare to
cooling a 1500 watt RF power amplifier but probably more analogous than
an airplane engine.
73,
Drew
AF2Z
On 06/02/18 17:09, Dauer, Edward wrote:
From: elecraft-boun...@mailman.qth.net On
Behalf Of Don Butler
Sent: Saturday, 2 June 2018 2:01 PM
To: 'Richard Thorne' ; Elecraft@mailman.qth.net
Subject: [Elecraft] KPA1500 Fan Noise Video posted
In response to N5ZC’s request I just made this short video to provide a listen
to the KPA1500
Every amplifier has some level of fan noise. My new KPA1500 is seriously
quieter than my former Expert 2KFA.
My Henry 2K Ultra fans were so loud that I couldn't keep it in the radio room.
Luckily I had the remote version.
My Harris RF-3230 (all solid state) had 8 six-inch muffin fans! It
To: "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
,
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
To: Paul Baldock ,"Elecraft@mailman.qth.net"
Subject: Re: [Elecraft] KPA1500 Fan Noise Video posted
Message-ID:
Content-Type:
So far for the short time I've had the 1500, I've used it very heavily in WPX
CW recently. At constant running , sometimes getting no answers which is
probably max duty cyclefor this kind of operating, I never went over about 74
degrees C which kicks in fan speed 3 (I think, hi, I had it
> Sent from Mail for Windows 10
>
> From: Paul Baldock
> Sent: Saturday, June 2, 2018 8:38 AM
> To: Don Butler; Elecraft@mailman.qth.net
> Subject: Re: [Elecraft] KPA1500 Fan Noise Video posted
>
> Does the power supply make any significant noise?
>
> - Paul
>
&g
right at the end you
can hear when the PS fans stop.
Don, N5LZ
Sent from Mail for Windows 10
From: Paul Baldock
Sent: Saturday, June 2, 2018 8:38 AM
To: Don Butler; Elecraft@mailman.qth.net
Subject: Re: [Elecraft] KPA1500 Fan Noise Video posted
Does the power supply make any significant noise
Does the power supply make any significant noise?
- Paul
At 11:01 PM 6/1/2018, Don Butler wrote:
In response to N5ZCâs request I just made
this short video to provide a listen to the
KPA1500's fans ... at least as they sound in my
shack. Follow this link to view:
...@mailman.qth.net] On Behalf Of Don Butler
Sent: Saturday, June 02, 2018 2:01 AM
To: 'Richard Thorne' ; Elecraft@mailman.qth.net
Subject: [Elecraft] KPA1500 Fan Noise Video posted
In response to N5ZC’s request I just made this short video to provide a listen
to the KPA1500's fans ... at least
Nice video Don. Speed 4 and 5 might be like trying to operate with the XYL
vacuuming around you. I wonder what duty cycle and power level it takes
for these speeds to kick in. It was good to see a comparison with the tube
amps. My Alphas were hardly noticeable when running but remember they are
The Valve amps do not require such cooling. 73 Doug EI2CN
Sent from my Samsung Galaxy smartphone.
Original message From: Don Butler Date:
02/06/2018 08:01 (GMT+01:00) To: 'Richard Thorne' ,
Elecraft@mailman.qth.net Subject: [Elecraft] KPA1500 Fan Noise Video posted
In response to N5ZC’s request I just made this short video to provide a listen
to the KPA1500's fans ... at least as they sound in my shack. Follow this link
to view: https://vimeo.com/273064144
In addition to the KPA1500 the video also includes footage of my Alpha 9500 and
Icom PA1 … each
net] On Behalf Of j...@kk9a.com
> Sent: Monday, May 28, 2018 9:14 PM
> To: 'Elecraft Reflector'
> Subject: [Elecraft] KPA1500 fan noise concern
>
> I imagine that due to the KPA1500's size it requires a higher volume of air
> than a large amplifier would. Its small size and weight
...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of j...@kk9a.com
Sent: Monday, May 28, 2018 9:14 PM
To: 'Elecraft Reflector'
Subject: [Elecraft] KPA1500 fan noise concern
I imagine that due to the KPA1500's size it requires a higher volume of air
than a large amplifier
That’s will be great!
Enviado desde mi iPhone
El 29 may. 2018, a la(s) 22:47, escribió:
> I was suggesting an optional hardware controller separate from the amp, not
> operating it remotely though a computer. OM Power, Acom and Henry have done
> this with some of their models.
>
> John KK9A
I was suggesting an optional hardware controller separate from the amp, not
operating it remotely though a computer. OM Power, Acom and Henry have done
this with some of their models.
John KK9A
Bill Stravinsky k3wjv wrote
Tue May 29 14:40:43 EDT 2018
John
I would imagine the 1500 will be
John
I would imagine the 1500 will be remotable just as the 500 is. A friend of
mine remotes his 500 to the basement just as he did with his Acom 2000aand he
is investigating remoting the 1500 he just got. As for a control box I don't
know. Not sure if the amp faults will be visible in the
I imagine that due to the KPA1500's size it requires a higher volume of air
than a large amplifier would. Its small size and weight make it appealing.
The Acom 2000 has a control box that is separate from the amp so you really
never hear the amp run. I am wondering it something similar can be done
Thanks for the offer, Clay. But we actually did extensive thermal analysis of
both the heat sink and fans, tested many different fan types and
configurations, and did comparative noise testing of the KPA1500 vs. a number
of other amps.
As you allude to, there’s no magic bullet. Heat must be
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
My KPA1500 seems to max out at about 65 C when running and calling CQ.
At that temperature, the fans are just barely audible with the
Radiosport headset. That would be way too loud for me with any other
headset I've used, let along a speaker. While it has other big
advantages, the noise
Well, I manually set the fan to 2 when I’m going to use the amp heavily. It’s a
bit noisy but acceptable to me.
73
Carl Yaffey K8NU
Recording studio.
cyaffeyno_s...@gmail.com
614 268 6353, Columbus OH
http://www.carl-yaffey.com
http://www.grassahol.com
http://www.bluesswing.com
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
I'm on the list for a '1500, expected sometime in August (maybe).
However, I'm getting concerned about the reported high fan noise level.
I currently have a '500, and following a suggestion a year or two ago,
I've turned the fans around 'backwards' and they seem to be quieter in
this
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