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Home » Measure Projects »
A RF probe is a circuit for testing equipment that converts a high frequency signal into a DC voltage. In this way it is very easy to measure RF voltages for either testing or adjustments of transmitters, receivers, modulators.
RF Probe Circuit Diagram
The RF probe circuit described here is suitable for signals with the frequency range from about 100 kHz to 1000 MHz. Although the diode used here can, in principle, go up to 3 GHz, the impedance of the ground connection will adversely influence the measurement at very high frequencies. Also, please keep in mind to use this probe only on low RF power.
RF Probe Components list
- 1 diode 1SS99
- 1 x 100p ceramic capacitor
- 1 x 10n ceramic capacitor
- 1 x 47K resistance
- 1 x small VU-meter
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Can some one tell me about the probe? Is it to be used instead of Antenna?
It is used as a piece of test equipment to measure the voltage generated by oscillators, RF amplifiers transmitters.
If connected to a long wire antenna and tuned LC tank circuit, and the meter replaced by 2000Ω headset, it would function as a crystal radio receiver.
May I use 1n4148 as probe diode? May I use multimeter to check?
Very nice