Hello to all I have a Gates BC250L AM broadcast transmitter that was recently taken out of service. Before converting it, I fired it up into a dummy load, and measured all parameters. It made a solid 250 watts, as it was intended, and was capable of 300 watts or more. It had approximately 73% efficiency, which according to the Gates owner's manual was correct (72 to 75%) After converting it to 160 meters, scaling the components, reneutralizing the finals, and retuning it, I can still get 250 watts out with little difficulty, BUT my efficiency has dropped to 61%. I cannot change lead lengths, due to its construction. Does anyone have any ideas? While 61% isn't bad, it's not what I had on the broadcast band. Many thanks.
73 Jerry K9AF
