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KPA-1500 power supply fan noise

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Peter W2IRT

KPA-1500 power supply fan noise

Is there any way to power off the fans (or lower their RPM) on the PSU if
the amp is in standby mode?

I would like to keep my rig on 6m throughout the day during the Es season.
The problem is my 6m antenna is on antenna port 2 on the KPA, which requires
the amp to be powered up. I only need to TX when a new grid pops up, but I
do like to monitor the band during the day while I'm working. My XYL is
working from home, and is in the same room for about 9 or 10 hours a day,
and the noise after 10 minutes was too much for her. Any suggestions?

Please-n-thanks.

---------------------------------------------
73 and Good DX
Peter, W2IRT

President, North Jersey DX Association

DXCC Card Checker
Letter O Manager, ARRL Incoming 2nd District QSL bureau

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Lovin' my K3S (S/N 10023)
73, Peter W2IRT

NW0M

Re: KPA-1500 power supply fan noise

HI Peter,

Put the 6M antenna on Antenna Port 1 for now.

73, Mitch
NWØM

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Larry (K8UT)

Re: KPA-1500 power supply fan noise

In reply to this post by Peter W2IRT

Peter

I built a slightly longer cable to match the length of the control cable
that came with the amplifier (about 3 feet longer if I recall
correctly).

This allows the PS to operate "remote" in a closet with the door closed.

-larry (K8UT)

------ Original Message ------
From: "Peter Dougherty" <[hidden email]>
To: [hidden email]
Sent: 2020-05-23 10:33:19 AM
Subject: [Elecraft] KPA-1500 power supply fan noise

>Is there any way to power off the fans (or lower their RPM) on the PSU if
>the amp is in standby mode?
>
>I would like to keep my rig on 6m throughout the day during the Es season.
>The problem is my 6m antenna is on antenna port 2 on the KPA, which requires
>the amp to be powered up. I only need to TX when a new grid pops up, but I
>do like to monitor the band during the day while I'm working. My XYL is
>working from home, and is in the same room for about 9 or 10 hours a day,
>and the noise after 10 minutes was too much for her. Any suggestions?
>
>Please-n-thanks.
>
>---------------------------------------------
>73 and Good DX
>Peter, W2IRT
>
>
>
>President, North Jersey DX Association
>
>DXCC Card Checker
>Letter O Manager, ARRL Incoming 2nd District QSL bureau
>
>
>
>______________________________________________________________
>Elecraft mailing list
>Home: http://mailman.qth.net/mailman/listinfo/elecraft
>Help: http://mailman.qth.net/mmfaq.htm
>Post: mailto:[hidden email]
>
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>Please help support this email list: http://www.qsl.net/donate.html
>Message delivered to [hidden email]

Eric Swartz - WA6HHQ

Re: KPA-1500 power supply fan noise

Administrator

Hi Peter,

If the amp is on, there needs to be at least some PS fan activity at a low speed to cool the PS in idle.

What s/n is your 1500? On later s/ns we changed a resistor in the ps fan circuit to slow them down a bit more.

An alternative is to swap your ant 1 and 2 connections, putting the 6m ant on ANT 1. Then you can listen to 6m with the amp off.

73,
Eric
elecraft.com
---
Sent from my iPhone 6S

> On May 23, 2020, at 8:10 AM, Larry (K8UT) <[hidden email]> wrote:
>
> Peter
>
> I built a slightly longer cable to match the length of the control cable that came with the amplifier (about 3 feet longer if I recall correctly).
>
> This allows the PS to operate "remote" in a closet with the door closed.
>
> -larry (K8UT)
>
> ------ Original Message ------
> From: "Peter Dougherty" <[hidden email]>
> To: [hidden email]
> Sent: 2020-05-23 10:33:19 AM
> Subject: [Elecraft] KPA-1500 power supply fan noise
>
>> Is there any way to power off the fans (or lower their RPM) on the PSU if
>> the amp is in standby mode?
>>
>> I would like to keep my rig on 6m throughout the day during the Es season.
>> The problem is my 6m antenna is on antenna port 2 on the KPA, which requires
>> the amp to be powered up. I only need to TX when a new grid pops up, but I
>> do like to monitor the band during the day while I'm working. My XYL is
>> working from home, and is in the same room for about 9 or 10 hours a day,
>> and the noise after 10 minutes was too much for her. Any suggestions?
>>
>> Please-n-thanks.
>>
>> ---------------------------------------------
>> 73 and Good DX
>> Peter, W2IRT
>>
>>
>>
>> President, North Jersey DX Association
>>
>> DXCC Card Checker
>> Letter O Manager, ARRL Incoming 2nd District QSL bureau
>>
>>
>>
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> Message delivered to [hidden email]
>
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Dr. William J. Schmidt, II

Re: KPA-1500 power supply fan noise

I have a little bit different question. I've been stuck on J6 since Feb 20 and not much to do here but play radio. The K3 and KPA1500 are on 24/7 in a dusty humid atmosphere (but made over 86,000 QSOs so far since Feb 20). I can imagine a time in the NEAR FUTURE where the fans will need to be replaced due to use. Is there any recognition of this with a "replacement fan kit" when it's time...?

Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ

Moderator – North American QRO Group at Groups.IO.

email: [hidden email]

-----Original Message-----
From: [hidden email] [mailto:[hidden email]] On Behalf Of Eric Swartz WA6HHQ - Elecraft
Sent: Saturday, May 23, 2020 10:53 AM
To: Larry (K8UT) <[hidden email]>
Cc: [hidden email]
Subject: Re: [Elecraft] KPA-1500 power supply fan noise

Hi Peter,

If the amp is on, there needs to be at least some PS fan activity at a low speed to cool the PS in idle.

What s/n is your 1500? On later s/ns we changed a resistor in the ps fan circuit to slow them down a bit more.

An alternative is to swap your ant 1 and 2 connections, putting the 6m ant on ANT 1. Then you can listen to 6m with the amp off.

73,
Eric
elecraft.com
---
Sent from my iPhone 6S

> On May 23, 2020, at 8:10 AM, Larry (K8UT) <[hidden email]> wrote:
>
> Peter
>
> I built a slightly longer cable to match the length of the control cable that came with the amplifier (about 3 feet longer if I recall correctly).
>
> This allows the PS to operate "remote" in a closet with the door closed.
>
> -larry (K8UT)
>
> ------ Original Message ------
> From: "Peter Dougherty" <[hidden email]>
> To: [hidden email]
> Sent: 2020-05-23 10:33:19 AM
> Subject: [Elecraft] KPA-1500 power supply fan noise
>
>> Is there any way to power off the fans (or lower their RPM) on the
>> PSU if the amp is in standby mode?
>>
>> I would like to keep my rig on 6m throughout the day during the Es season.
>> The problem is my 6m antenna is on antenna port 2 on the KPA, which
>> requires the amp to be powered up. I only need to TX when a new grid
>> pops up, but I do like to monitor the band during the day while I'm
>> working. My XYL is working from home, and is in the same room for
>> about 9 or 10 hours a day, and the noise after 10 minutes was too much for her. Any suggestions?
>>
>> Please-n-thanks.
>>
>> ---------------------------------------------
>> 73 and Good DX
>> Peter, W2IRT
>>
>>
>>
>> President, North Jersey DX Association
>>
>> DXCC Card Checker
>> Letter O Manager, ARRL Incoming 2nd District QSL bureau
>>
>>
>>
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net Please help support this
>> email list: http://www.qsl.net/donate.html Message delivered to
>> [hidden email]
>
> ______________________________________________________________
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> list: http://www.qsl.net/donate.html Message delivered to
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NJ8M

Re: KPA-1500 power supply fan noise

In reply to this post by Peter W2IRT

Head to walmart and buy a box of cheap hot pink foam ear plugs that have 30
db noise reduction. Or have her wear earbuds to a new ipod listen to
music...sign her up for pandora.

LOL

Vy 73,
Morgan NJ8M

On Sat, May 23, 2020 at 9:35 AM Peter Dougherty <[hidden email]> wrote:

> Is there any way to power off the fans (or lower their RPM) on the PSU if
> the amp is in standby mode?
>
> I would like to keep my rig on 6m throughout the day during the Es season.
> The problem is my 6m antenna is on antenna port 2 on the KPA, which
> requires
> the amp to be powered up. I only need to TX when a new grid pops up, but I
> do like to monitor the band during the day while I'm working. My XYL is
> working from home, and is in the same room for about 9 or 10 hours a day,
> and the noise after 10 minutes was too much for her. Any suggestions?
>
> Please-n-thanks.
>
> ---------------------------------------------
> 73 and Good DX
> Peter, W2IRT
>
>
>
> President, North Jersey DX Association
>
> DXCC Card Checker
> Letter O Manager, ARRL Incoming 2nd District QSL bureau
>
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]
>

Jim Brown-10

Re: KPA-1500 power supply fan noise

In reply to this post by Peter W2IRT

On 5/23/2020 7:33 AM, Peter Dougherty wrote:
> Is there any way to power off the fans (or lower their RPM) on the PSU if
> the amp is in standby mode?

You did read the manual, right? Fan speed is on the menu.

73, Jim K9YC
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Charlie T, K3ICH

Re: KPA-1500 power supply fan noise

In reply to this post by Eric Swartz - WA6HHQ

Well, THAT's good to hear......
The PW-1 MUST be "ON" before ANY signals get to the radio.
Admittedly, this all happens automatically with the newer versions as soon as you punch the radio's power button, but it's great to hear even THAT won't be necessary with the KPA-1500 to simply "check-the-band".

73, Charlie k3aICH
'

-----Original Message-----
From: [hidden email] <[hidden email]> On Behalf Of Eric Swartz WA6HHQ - Elecraft
Sent: Saturday, May 23, 2020 11:53 AM
To: Larry (K8UT) <[hidden email]>
Cc: [hidden email]
Subject: Re: [Elecraft] KPA-1500 power supply fan noise

Hi Peter,

If the amp is on, there needs to be at least some PS fan activity at a low speed to cool the PS in idle.

What s/n is your 1500? On later s/ns we changed a resistor in the ps fan circuit to slow them down a bit more.

An alternative is to swap your ant 1 and 2 connections, putting the 6m ant on ANT 1. Then you can listen to 6m with the amp off.

73,
Eric
elecraft.com
---
Sent from my iPhone 6S

> On May 23, 2020, at 8:10 AM, Larry (K8UT) <[hidden email]> wrote:
>
> Peter
>
> I built a slightly longer cable to match the length of the control cable that came with the amplifier (about 3 feet longer if I recall correctly).
>
> This allows the PS to operate "remote" in a closet with the door closed.
>
> -larry (K8UT)
>
> ------ Original Message ------
> From: "Peter Dougherty" <[hidden email]>
> To: [hidden email]
> Sent: 2020-05-23 10:33:19 AM
> Subject: [Elecraft] KPA-1500 power supply fan noise
>
>> Is there any way to power off the fans (or lower their RPM) on the
>> PSU if the amp is in standby mode?
>>
>> I would like to keep my rig on 6m throughout the day during the Es season.
>> The problem is my 6m antenna is on antenna port 2 on the KPA, which
>> requires the amp to be powered up. I only need to TX when a new grid
>> pops up, but I do like to monitor the band during the day while I'm
>> working. My XYL is working from home, and is in the same room for
>> about 9 or 10 hours a day, and the noise after 10 minutes was too much for her. Any suggestions?
>>
>> Please-n-thanks.
>>
>> ---------------------------------------------
>> 73 and Good DX
>> Peter, W2IRT
>>
>>
>>
>> President, North Jersey DX Association
>>
>> DXCC Card Checker
>> Letter O Manager, ARRL Incoming 2nd District QSL bureau
>>
>>
>>
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net Please help support this
>> email list: http://www.qsl.net/donate.html Message delivered to
>> [hidden email]
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net Please help support this email
> list: http://www.qsl.net/donate.html Message delivered to
> [hidden email]

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Peter W2IRT

Re: KPA-1500 power supply fan noise

In reply to this post by NJ8M

Giving her anything hot pink will be met with words not fit for family newsgroups, and possibly the forced removal of a part or parts that’s very near and dear to me. Besides, the racket bugs the heck out of me, too.

And I won’t even get into the amp noise when I’m running FT8 on 6, but that’s to be expected, alas.

- pjd

From: Morgan Bailey <[hidden email]>
Sent: Saturday, May 23, 2020 2:11 PM
To: Peter Dougherty <[hidden email]>
Cc: [hidden email]
Subject: Re: [Elecraft] KPA-1500 power supply fan noise

Head to walmart and buy a box of cheap hot pink foam ear plugs that have 30 db noise reduction. Or have her wear earbuds to a new ipod listen to music...sign her up for pandora.

LOL

Vy 73,

Morgan NJ8M

On Sat, May 23, 2020 at 9:35 AM Peter Dougherty <[hidden email] <mailto:[hidden email]> > wrote:

Is there any way to power off the fans (or lower their RPM) on the PSU if
the amp is in standby mode?

I would like to keep my rig on 6m throughout the day during the Es season.
The problem is my 6m antenna is on antenna port 2 on the KPA, which requires
the amp to be powered up. I only need to TX when a new grid pops up, but I
do like to monitor the band during the day while I'm working. My XYL is
working from home, and is in the same room for about 9 or 10 hours a day,
and the noise after 10 minutes was too much for her. Any suggestions?

Please-n-thanks.

---------------------------------------------
73 and Good DX
Peter, W2IRT

President, North Jersey DX Association

DXCC Card Checker
Letter O Manager, ARRL Incoming 2nd District QSL bureau

______________________________________________________________
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Lovin' my K3S (S/N 10023)
73, Peter W2IRT

Peter W2IRT

Re: KPA-1500 power supply fan noise

In reply to this post by NJ8M

Lovin' my K3S (S/N 10023)
73, Peter W2IRT

Dave wo2x

Re: KPA-1500 power supply fan noise

In reply to this post by Eric Swartz - WA6HHQ

Hi Eric,

My 1500 is s/n 423. I do think the power supply fans are a bit loud in standby. Is my amp prior to the resistor change?
I have added the load resistor in the field and done the sample out mod for adaptive predistortion in the field also.

73
Dave wo2x

-----Original Message-----
From: [hidden email] <[hidden email]> On Behalf Of Eric Swartz WA6HHQ - Elecraft
Sent: Saturday, May 23, 2020 11:53 AM
To: Larry (K8UT) <[hidden email]>
Cc: [hidden email]
Subject: Re: [Elecraft] KPA-1500 power supply fan noise

Hi Peter,

If the amp is on, there needs to be at least some PS fan activity at a low speed to cool the PS in idle.

What s/n is your 1500? On later s/ns we changed a resistor in the ps fan circuit to slow them down a bit more.

An alternative is to swap your ant 1 and 2 connections, putting the 6m ant on ANT 1. Then you can listen to 6m with the amp off.

73,
Eric
elecraft.com
---
Sent from my iPhone 6S

> On May 23, 2020, at 8:10 AM, Larry (K8UT) <[hidden email]> wrote:
>
> Peter
>
> I built a slightly longer cable to match the length of the control cable that came with the amplifier (about 3 feet longer if I recall correctly).
>
> This allows the PS to operate "remote" in a closet with the door closed.
>
> -larry (K8UT)
>
> ------ Original Message ------
> From: "Peter Dougherty" <[hidden email]>
> To: [hidden email]
> Sent: 2020-05-23 10:33:19 AM
> Subject: [Elecraft] KPA-1500 power supply fan noise
>
>> Is there any way to power off the fans (or lower their RPM) on the
>> PSU if the amp is in standby mode?
>>
>> I would like to keep my rig on 6m throughout the day during the Es season.
>> The problem is my 6m antenna is on antenna port 2 on the KPA, which
>> requires the amp to be powered up. I only need to TX when a new grid
>> pops up, but I do like to monitor the band during the day while I'm
>> working. My XYL is working from home, and is in the same room for
>> about 9 or 10 hours a day, and the noise after 10 minutes was too much for her. Any suggestions?
>>
>> Please-n-thanks.
>>
>> ---------------------------------------------
>> 73 and Good DX
>> Peter, W2IRT
>>
>>
>>
>> President, North Jersey DX Association
>>
>> DXCC Card Checker
>> Letter O Manager, ARRL Incoming 2nd District QSL bureau
>>
>>
>>
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net Please help support this
>> email list: http://www.qsl.net/donate.html Message delivered to
>> [hidden email]
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net Please help support this email
> list: http://www.qsl.net/donate.html Message delivered to
> [hidden email]

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Jim Brown-10

Re: KPA-1500 power supply fan noise

In reply to this post by Jim Brown-10

Sorry, I missed that you were concerned with the PSU. I've never heard
them because the fan(s) on the RF deck are so loud. :)

73, Jim

On 5/23/2020 1:22 PM, Peter Dougherty wrote:
> Nothing in my manual (Revision B1, February 12, 2019).
>

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Eric Norris-2

Re: KPA-1500 power supply fan noise

In reply to this post by Jim Brown-10

I believe he is talking about PS fans, which is not on the menu. However,
there is a mod kit from Elecraft that includes the resistor. It is very
easy to install. No soldering is required, and the most time-consuming
part of the install is removing the cover. Contact Elecraft support and
they will send it to you, if they are in stock during the shutdown. It
helped my KPA1500 SN 4XX.

73 Eric WD6DBM

On Sat, May 23, 2020, 11:22 AM Jim Brown <[hidden email]> wrote:

> On 5/23/2020 7:33 AM, Peter Dougherty wrote:
> > Is there any way to power off the fans (or lower their RPM) on the PSU if
> > the amp is in standby mode?
>
> You did read the manual, right? Fan speed is on the menu.
>
> 73, Jim K9YC
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]
>

Dave wo2x

Re: KPA-1500 power supply fan noise

Thanks Eric. I have s/n 423 and will email support.

Dave wo2x

Sent from my iPad

> On May 23, 2020, at 9:07 PM, Eric Norris <[hidden email]> wrote:
>
> I believe he is talking about PS fans, which is not on the menu. However,
> there is a mod kit from Elecraft that includes the resistor. It is very
> easy to install. No soldering is required, and the most time-consuming
> part of the install is removing the cover. Contact Elecraft support and
> they will send it to you, if they are in stock during the shutdown. It
> helped my KPA1500 SN 4XX.
>
> 73 Eric WD6DBM
>
>> On Sat, May 23, 2020, 11:22 AM Jim Brown <[hidden email]> wrote:
>>
>>> On 5/23/2020 7:33 AM, Peter Dougherty wrote:
>>> Is there any way to power off the fans (or lower their RPM) on the PSU if
>>> the amp is in standby mode?
>>
>> You did read the manual, right? Fan speed is on the menu.
>>
>> 73, Jim K9YC
>> ______________________________________________________________
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