Yesterday I reported that the screen current of my 4CX1000A was dropping
when the key was down for more than 10 seconds or so. Several of you
suggested that some component in the tank circuit or screen supply was
heating up.
Well, I found it. The dummy load! Sometimes you don't see the nose in front
of your face. I have a dummy load which is a Drake '1000-watt' unit that I
added several muffin fans to. I guess the fans weren't cooling it fast
enough -- the actual resistor element is rated at 500 watts -- so it was
heating up, changing in value, and therefore changing the loading.
--
Vic, K2VCO
Fresno CA
[1]http://www.qsl.net/k2vco/
References
1. http://www.qsl.net/k2vco/
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