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List:       elecraft
Subject:    Re: [Elecraft] KPA1500 fan noise concern
From:       "john () kk9a ! com" <john () kk9a ! com>
Date:       2018-05-30 15:16:25
Message-ID: CAC1O_Bhk-vVwk4o8+bqq7SaL08k2abZFwPtrg-r6xucnLZ1MSQ () mail ! gmail ! com
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If you like computer control of your station, than I agree that the remote
program is a great solution.  I still have stacks of rotator control boxes
and relay switches on my desk and I can make QSOs without a computer, which
is why I suggested something like this
https://www.arraysolutions.com/om-2500-rem for the Elecraft amp.

John KK9A

Sent via the Samsung Galaxy 7 edge, an AT&T 4G LTE smartphone.

On Wed, May 30, 2018 at 10:15 AM, N2TK, Tony <tony.kaz@verizon.net> wrote:

> Hi John,
> For a long time I had the Acom 2000A sitting on a shelf in the basement
> right below my feet in the shack. I used their remote box which worked very
> well. I have a KPA500 on the same shelf using KPA500 Remote which also
> works
> very well for controlling the amp. Once the KPA1500 Remote is available I
> would think it would work as well as the KPA500 Remote program to control
> the amp. I can't think of a reason to have additional hardware in the
> shack.
> I am in the process of removing more of the manual controls to the
> basement.
> 73,
> N2TK, Tony
>
> -----Original Message-----
> From: elecraft-bounces@mailman.qth.net
> [mailto:elecraft-bounces@mailman.qth.net] On Behalf Of john@kk9a.com
> Sent: Monday, May 28, 2018 9:14 PM
> To: 'Elecraft Reflector' <elecraft@mailman.qth.net>
> 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 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
> with
> the Elecraft KPA1500, perhaps an option like the K-Pod, so that the noise
> source is further from the operating position?
>
> John KK9A
>
>
>
> 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 removed, with
> various physical and electrical constraints to be satisfied.
>
> We have some pretty amazing thermal imaging devices that we use to examine
> heat signatures of electrical components. These were used during R&D, which
> is how we determined that two LDMOS devices were far better than one for
> heat distribution. We also used it to evaluate the design of our very
> large/very thick copper heat spreader. On the production line, we review
> all
> modules for hot spots during burn-in and make sure the cooling is working
> perfectly (onset temperature, air distribution around modules, etc.).
>
> Of course supplemental cooling of various types has been used with
> amplifiers in the past. I believe we have a couple of customers and staff
> experimenting with this idea, and anything that emerges will be posted
> here.
>
> 73,
> Wayne
> N6KR
>
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>
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