KPA1500 fan noise concern
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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 ______________________________________________________________ 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] |
Re: KPA1500 fan noise concern
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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 vfo B area ofthe K3. It tells you its on-off or in standby. BillK3WJV On Monday, May 28, 2018, 9:18:04 PM EDT, [hidden email] <[hidden email]> wrote: 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 ______________________________________________________________ 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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In reply to this post by john@kk9a.com
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: [hidden email] [mailto:[hidden email]] On Behalf Of [hidden email] Sent: Monday, May 28, 2018 9:14 PM To: 'Elecraft Reflector' <[hidden email]> 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 ______________________________________________________________ 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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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 <[hidden email]> 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: [hidden email] > [mailto:[hidden email]] On Behalf Of [hidden email] > Sent: Monday, May 28, 2018 9:14 PM > To: 'Elecraft Reflector' <[hidden email]> > 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 > > ______________________________________________________________ > 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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