I can't speak to the issue of the fan not coming on, but I can offer some experience with a hot heat sink. A few years ago I used my K2/100 to test the temperature compensation mods during which the heat sink became too hot to hold my hand on it. The internal air temperature of the K2 was around 50C/122F (monitored by a probe) with the fan running. No ill effects resulted. It's designed for that sort of thing.
Ron AC7AC -----Original Message----- Hi, Yesterday I participated with my K2/100 in the Pike Special Event station here in Colorado Springs, Colorado. It was in observance of Zebulon Pike's bicentennial discovery of Pikes Peak. We were in a terrible location in a downtown valley with antenna restrictions imposed by the city Parks and Recreation department as the trees are older than the bicentennial. Propagation on 20 meters was very bad from our perspective. Now to my point. We were outside in 90 degree plus temps for over four hours. We were running PSK31 and SSB. PSK was kept below 25 watts. The fan on the KPA100 did not come on the entire time. I had it set for LoHi in the KPA100 menu. So it should have at least been on low speed all the time. The heat sink got very hot....almost too hot to touch. A couple time I though I smelled hot electronics. The PA HOT message never appeared. To add complications when I got home it worked as advertised in my cool basement. I did find the temperature calibration was set at 11 degrees centigrade (51 degrees f). Must have set it during the winter when the basement gets chilly. I reset it to 23 degrees centigrade. (71 f). Does anyone know of any mystery problems or other legacy fan problems with the KPA100? In a couple weeks I plan to disassemble it and have a look after I finish another K2 for an acquantance. The schematic nor circuit description does not address the fan itself as I can find. There is a "T sense" circuit but how the fan ties in is not shown as I can find. Your comments and thoughts will be very welcomed. Jim, AB0UK K2/100 S/N 4787 _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
