John Smith wrote:
It was pointed out, that this was over-stressing components capabilites (Roy
even made comment)--the FET will just not take the demands put on it at 10
watts (I ran the ten watts through a resistive splitter and sent ~5 watts
too it--with a new FET, it lasted long enough for proof of concept tests...
then FET blew again)

For a matched Z0=50 ohm system, five watts of forward power
is 15.8 volts. When calibrated, the voltage from the toroid
has to equal that voltage. That means, for the forward power
indication, 31.6 volts must be tolerated for five watts.

For reflected power, the current will be driven by the difference
of the two voltages. When matched at five watts, that difference
will be 15.8v - 15.8v and the LED will be dark. This might be a
hint to eliminate the forward power indication altogether and
go with only a reflected power indication. After all, the reflected
power indication is the most useful and when zero, the system is
matched.
--
73, Cecil http://www.qsl.net/w5dxp


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