[AMPS] AM-6155 Output Power / Plate Current Instabilty ( Drift Upward )

[K7xq@aol.com]

Has anyone experinced the following problem with thier modified AM-6155 at 432 MHz ??

1) At higher output power levels and a fix input power, the power output and Plate current drifts UPWARD to a point where it pegs the Current meter ( @ 500 ma )and still only 250 watts output ??

The modifications includes the air wound 5 turn coil just to the inside of the cavity at the anode side.There was a article written which actually states that this condition is a real condtion that can occur but I do not know how to stabilize the output and current and still get 300 watts out.This occurs when there is only 10 watts applied to the input so i dont think the grid is overdriven.

Jeff K7XQ



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