Bacon, not trying to be contrite, but where in the old rules did the .25
second time constant appear? I have a copy of the old rules and don't see
it. It says only that "have the means".
73 Jim
W5JO
At that time, plate power input to an AM
transmitter was measured by the reaings of DC meters
with approximately 0.25 second time constant. That
time constant would make the meters read average
voltage and current, which smoothed out SSB and
controlled carrier signals. But on plate-modulated AM
it did not read true power during modulation, because
it was looking at average voltage and average current
separately, while in AM the voltage and current are not
separate, but they increase and decrease together,
resulting in higher power input during modulation.
