To: | <amps@contesting.com> |
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Subject: | [Amps] Question on Ameritron amp wattmeter circuit |
From: | n1rj at pivot.net (Roger D. Johnson) |
Date: | Thu Feb 6 20:36:45 2003 |
To properly sense power you must sample both the current and voltage on the line. The toroid acts as a current trans- former to sample the current and the caps act as a voltage divider to sample the voltage. I don't have the schematic for reference, but I suspect the variable cap is used to set the power reading. 73, Roger |
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