On 05/18/11 05:27 AM, Carey Lockhart, KC5GTT wrote:
> hello all,
>
> what is the proper formula to get the PA efficiency of a amplifier?
>
> Carey
1) Calculate the input power = V * I
where V is anode/collector/drain voltage (depending on whether its tube or
semiconductor
I is the anode/collector/drain current (depending on whether it's tube or
semiconductor)
2) Measure the output power P.
3) Efficiency (in percentage) = 100*P/(V*I)
Note, few power meters are going to be accurate to better than +/- 10%
(including the Bird, despite its spec of 5% of FSD), so don't expect an
accurate
result unless you use a precision power meter with a calibrated coupler or
attenuator.
Dave
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