I determined the cause was a flaw in the recent shack remodeling. I had the K-3 and the amp. under a shelf that apparently wasn't allowing enough air flow. Even though I had the more then the recommended clearances for air flow, that was not enough. I put the amp. out in the wide open Sunday morning and ran all day at 500 watts on all bands without incident. In addition the temperature in the shack was around 75 degrees Sat. night, apparently compounding the accumulation of heat under the shelf.
Thank you all for your responses and insight. 73 Dwight NS9I On 9/30/2012 1:43 PM, Jim Brown wrote: > On 9/30/2012 7:53 AM, DGB wrote: >> Anyone have a similar problem, makes it useless for rtty contesting and >> running. No problems in CW contests at full bore! > Something is broken. I get 500W out on 6M (the most difficult band) > with modes like JT65, ISCAT, and FSK441 for 48 seconds on each > transmission; typically the fan will crank higher after 35-40 seconds. > On the lower bands I run it at 600W on JT65 and RTTY. I also had a beta > unit for a RTTY contest weekend, with instructions to "run it with all > the lights lit." Never any problems. > > 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 > ______________________________________________________________ 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
