On Fri, 15 May 2009 09:14:50 -0700 (PDT), Hisashi T Fujinaka wrote: >Well, you're all ignoring the longevity reduction with heat.
I'm certainly not, and I doubt that the designers of the radio have either. K6XX, an engineer who has looked carefully at the design, considers it very well designed from the point of view of heat and ventilation. The lead engineer is the same guy who designed the K2/100. They've sold close to 7,000 of them, and I've never heard of a problem with heat. Those who talk about cutting holes to "help" ventilate the radio are probably forgetting the very well controlled heat flow that has been established by the design. One side of the radio runs warm because it is the heat sink for a couple of transistors. The bottom of the chassis runs warm because it is a heat sink for the driver transistors. This is very solid EE design. It is NOT indicative of a problem, or of operation that will cause premature failure. If you want to be super conservative, set up a small muffin fan to blow cool air on the radio. And, of course, calibrate the temperature sensors properly. But don't mess with the design. There's far more to it than meets the eye, especially the eye of someone who isn't an EE with this sort of design experience under his belt. 73, Jim Brown 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
