Classic RF Probe using 1N34A Diode | RF Circuits

Saturday, November 24, 2012

Classic RF Probe using 1N34A Diode

One of the handiest accessories you can have around the shack is RF Probe. It can be used to measure RF voltage (and power), trace RF signals in a new design, and troubleshoot malfunctioning RF circuits. This RF probe is easy to build.


Complete Classic RF Probe Schematic



For best probe accuracy, size the resistor to match your DC Voltmeter's input impedance:
R = 4.7 Meg for Zin = 11-Meg;
R = 4.3 Meg for Zin = 10-Meg;
R = 430 K for Zin = 1-Meg;

Source: Classic RF Probe

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