|[AMRadio] AM Transmitter Advice??|
w5jo at brightok.net
Sat Feb 18 19:28:33 EST 2006
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".
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.
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