On 6/3/2014 7:19 AM, Harry Yingst via Elecraft wrote:
Replacing the fans was a worthwhile improvement and made copy easier.
Something does not compute. The fan in my KPA500 is pretty quiet on RX, and only gets loud during long transmissions, continuing for a short time (a few seconds) after that. How does a fan that is noisy only on TX make copy difficult on RX?
Another thing that doesn't compute is that a lot of the noise I'm hearing is air flow. Perhaps the replacement fan is running slower, which would reduce air flow, which would reduce cooling. Again, I would approach all of this with great caution. Cooling of power devices is as important an element of the design of amplifier as any of the rest of the circuitry.
I think it's a mistake to think that we hear the fan because it's a "cheap" or inferior one. We hear it because it's working.
73, Jim K9YC ______________________________________________________________ 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]
