Transcription of Simple RF-Power Measurement - QSL.net
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Simple RF-Power Measurement - QSL.net
By Wes Hayward, W7 ZOI, and Bob Larkin, W7 PUA. Simple RF-Power Measurement Making power measurements from PHOTOS BY. JOE BOTT. IGLI ERI, AA1G. W. nanowatts to 100 watts is easy with these Simple homebrewed instruments! M. easuring RF power is central to power indicators. power meter, extending the upper limit by almost everything that we do as The power-measuring system de- 40 dB, allowing Measurement of up to radio amateurs and experiment- scribed here is based on a recently intro- 100 W (+50 dBm). ers. Those applications range from sim- duced IC from Analog Devices: the ply measuring the power output of our AD8307.
An inside view of the simple attenuator shown in Figure 3. The tap extends the nominal +10 dBm power meter maximum level to +50 dBm, or 100 W. Power dissipation becomes an issue at this level, so R1 is built from three series-connected half-watt, carbon-film resistors. The tap is built with the J1 to J2 con-nection configured as a 50-Ω transmis-
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