The connector of concern was fixed long ago and applied to units up to #800 or so from memory...others will correct me...:-)
The K3 is used extensively in contest, DXpeditions as well as daily for for long periods by many of us and to honest I rarely notice the K3 fans are on and cycling has never bothered me. I do use headphones most of the time, especially in a contest, maybe this is why I don't notice any noise? YMMV Gary On 14 April 2011 04:10, Paul Kirley <[email protected]> wrote: > There are indeed two ways to eliminate fan cycling. K2AV suggests one > approach, to run the fans all the time. Another approach is to run > QRP all the time. Neither of those extremities appeals to me. > > The K3 necessarily has a temperature spread (which seems to be small) > between fan-on and fan-off temperatures. I am merely suggesting that > this spread be increased. If "designer" options are a concern, the > current unadjustable spread could simply be increased to a greater, > but still unadjustable, spread. > > As I understand it, the K3's final transistors are quite robust with > regard to temperature. The thermal Achilles heel of the K3 appears to be > the amplifier's multipin connector, at least according to other posts. > The fans don't seem to be able to cool that connector adequately. Less > fan cycling will neither solve nor exacerbate that problem. > > 73, Paul W8TM > > *********************** > > K2AV sed: > If cycling bothers you try setting CONFIG:KPA3 to FAN1 or FAN2. If > you are operating SSB, that may remove most cycling. This adjustment > sets the MINIMUM fan speed. "NOR" is fan off until called for. > > > > ______________________________________________________________ > 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 > -- *VK4FD - Motorhome Mobile Elecraft Equipment K3 #679, KPA-500 #018 Living the dream!!!* ______________________________________________________________ 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
