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The 59318 from Boonton is a Power Sensor with Frequency 0.5 to 18 GHz, Power Range -34 to +20 dBm, Peak Power Range -24 to +20 dBm, CW Power Range -34 to +20 dBm, Rise time <10 ns. More details for 59318 can be seen below.
TVAC compliant USB and LAN Power Sensor
10 MHz to 8 GHz Three-path Diode Power Sensors
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