> To measure power delivered to the feedline, you have to subtract
> reflected power from forward.
It really works like that when the load impedance is enough close to the
nominal impedance of the line used as the directional coupler.
73,
Mauri I4JMY
> The best way to detect a load fault is to simply watch the reflected
> power. That's what radios do, and with a directional coupler it
> works perfectly fine. Sample forward power to control the drive
> power to the PA, and reflected power for SWR shutdown.
>
> This always works under any load condition.
>
>
> 73, Tom W8JI
> w8ji@contesting.com
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