Sorry if this has been covered before, but I can't recall that it has. Is there any reason why power output falls off over time? Here's what I did: using MMTTY, I "diddled" into a 50-Ohm dummy load for one minute. I initially had a power output of 525 Watts which went to 500 W shortly and went down to about 465 W when MMTTY "diddling" timed out. I repeated that process later, monitoring current and noted that it also went down over time...makes sense! But my question is WHY? I was under the impression that I needed to run the amp at 500 W on RTTY for optimum efficiency because in an earlier posting I noted that at 150W output (in BPSK31), the amp was very inefficient and the fan was pretty loud. If I can't derate the output and I can't run full output, what do I do with the KPA500 in the digital modes? Bert, N4CW ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected]
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