"I am not an expert on Bird 43 wattmeters..............I was curious as to
why it was typically 3X and not 4X as modulation theory would predict, for
100% sinewave modulation"
John,
Using an audio generator at 1 kHz, a scope and the peak reading bird I am
able to get the 4X peak from my AM transmitter. I will also mention that as
soon as the audio generator goes above 1.8 kHz the peak reading bird starts
to go down. By the time the audio generator gets to 5 kHz the peak bird is
reading the same as the non-peak bird, while at the same time the scope is
showing that the transmitter is still doing 100% modulation with an
undistorted sine wave.
73,
Ken W2DTC
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