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The 80421A from Giga-tronics is a Power Sensor with Frequency 10 MHz to 18 GHz, Power Range -47 dBm to +37 dBm, Max Input Power +37 dBm (5 W). More details for 80421A 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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