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KPA1500 fan on stby

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KPA1500 fan on stby

Why is the KPA1500 PS fan making so much noise when the amp is in STBY and just the ATU is being used? What are those big boys cooling?
I'd hoped this would change with the new firmware but it did not. Any hope for the future?
73 Eric WD6DBM

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Ned Mountain WC4X

Re: KPA1500 fan on stby

Eric,
I totally agree that the KPA 1500 PS fan noise is mildly irritating to the
point that I moved mine to the other side of the wall--An option not
available to all. It sure seems like it could run much less than it does.
I have yet to feel any heat coming from the PS unit even after relatively
heavy use. Maybe we can hope for this to be addressed in the future.
Otherwise---a fantastic product!!
Ned WC4X

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Richard Thorne-4

Re: KPA1500 fan on stby

In reply to this post by Elecraft mailing list

As soon as the supply has a load on it a good bit of the noise is reduced.

Maybe there's a way to put a small constant load on the supply?

Rich - N5ZC

On 11/8/2018 6:59 AM, eric norris via Elecraft wrote:

> Why is the KPA1500 PS fan making so much noise when the amp is in STBY and just the ATU is being used? What are those big boys cooling?
> I'd hoped this would change with the new firmware but it did not. Any hope for the future?
> 73 Eric WD6DBM
>
> Sent from Yahoo Mail on Android
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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> Please help support this email list: http://www.qsl.net/donate.html
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Eric Swartz - WA6HHQ

Re: KPA1500 fan on stby

Administrator

The PS fans run at a constant slow speed to primarily cool the main 50V
switching PS. Interestingly, even at idle, a switcher is a little less efficient
than at full load, so it still needs some cooling air flow.

We design all of our product cooling on a very conservative basis. There is a
chance we over did this and can slow down the the 1500's PS fans a bit - I'll
report back here after we do some further temperature testing.

I don't understand the comment about the PS fans getting quieter when the supply
is under load in TX. They always run at the same speed. Is there something else
I'm missing?

73,
Eric
/elecraft.com/

On 11/9/2018 2:52 PM, Richard Thorne wrote:

> As soon as the supply has a load on it a good bit of the noise is reduced.
>
> Maybe there's a way to put a small constant load on the supply?
>
> Rich - N5ZC
>
> On 11/8/2018 6:59 AM, eric norris via Elecraft wrote:
>> Why is the KPA1500 PS fan making so much noise when the amp is in STBY and
>> just the ATU is being used? What are those big boys cooling?
>> I'd hoped this would change with the new firmware but it did not. Any hope
>> for the future?
>> 73 Eric WD6DBM
>>
>> Sent from Yahoo Mail on Android
>> ______________________________________________________________
>> 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
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K9MA

Re: KPA1500 fan on stby

In reply to this post by Richard Thorne-4

I could be wrong, but I don't think the PS fan is controlled by the
KPA1500 at all. The power supply itself is from a third party, and I
think the fan is integral to it, and probably also the fan controller.

73,
Scott K9MA

On 11/9/2018 16:52, Richard Thorne wrote:

> As soon as the supply has a load on it a good bit of the noise is
> reduced.
>
> Maybe there's a way to put a small constant load on the supply?
>
> Rich - N5ZC
>
> On 11/8/2018 6:59 AM, eric norris via Elecraft wrote:
>> Why is the KPA1500 PS fan making so much noise when the amp is in
>> STBY and just the ATU is being used? What are those big boys cooling?
>> I'd hoped this would change with the new firmware but it did not.
>> Any hope for the future?
>> 73 Eric WD6DBM

--
Scott K9MA

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