With an adequate sized heat sink, one could build a legal-limit solid state amplifier with no fan whatsoever, but the most Hams want physically smaller equipment even if it requires cooling fans. It's not bad engineering. It is good engineering coming up with a product the buyer wants.
I know that Wayne went to some effort to make select K3/ K3S fans that are as quiet as possible while still providing the needed airflow for high duty-cycle modes. The KPA500 demands far more air than the K3/K3S. The only really silent fan is no fan at all. That's something most QRP operators enjoy. 73, Ron AC7AC -----Original Message----- From: Elecraft [mailto:[email protected]] On Behalf Of Ignacy Sent: Tuesday, January 10, 2017 8:19 AM To: [email protected] Subject: Re: [Elecraft] KPA-500 Running hot on 20m I wrote an article on fan noise including in amplifiers. See http://www.eham.net/articles/38328. Ignacy, NO9E -- View this message in context: http://elecraft.365791.n2.nabble.com/KPA-500-Running-hot-on-20m-tp7625577p76 25633.html Sent from the Elecraft mailing list archive at Nabble.com. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
