On 2/6/2021 12:05 PM, Ray wrote:
Trust the Wattmeter Only if it is seeing a 50 Ohm Dummy Load.
Bird slugs have a tolerance of 5% of full scale, and the reading is only
valid into a 50 ohm resistive load. The LP100A is 5% of the reading at
any power level and into complex loads (i.e, not only 50 ohms
resistive). Years ago, Electraft used an LP100A for final test of their
rigs. Don't know if they still do.
About five years ago, I bought W6OSP's LP100A from his estate and added
a second coupler for my SO2R station, and had both calibrated at his
factory. It auto-switches with signal from the amplifiers for the two
radios.
73, Jim K9YC
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