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    Measures Relative Field Strength with your wattmeter.

    Similar to the obsoleted Bird 4030 FS element.

    This sensor does not have an amplifier, it is a passive device for relatively larger signals.

    Use your Bird Model 43 as a relative field strength meter for sniffing out transmitters, antenna tuning, etc. 1 to 1000 MHz.

    Compatible with 30uA meter instruments - Bird Model 43, CDI 81000A, etc.

    No active components, no batteries required.