50_W_RF

Published:2009/7/14 4:03:00 Author:May | From:SeekIC

Direct-reading RF wattmeter developed for use at 27.12 MHz is accurate to within 1% of full scale. Circuit can be adapted for other frequencies up to about 100 MHz. Does not require subtraction of two readings to find power transferred to mismatched loads. RF line current and voltage are sensed by current transformer and voltage divider that can be remotely located. Meter is driven by IC balanced mixer functioning as four-quadrant analog multiplier. Average product of voltage and current appears as DC reading on microammeter．-F. C. Gabriel，Compact RF Wattmeter Measures up to 50 Watts、Electronics, Nov. 8, 1973,p 122.



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