What is the RF probe?

Radio frequency probe (RF) is a simple circuit that allows the voltmeter to mark the relative amplitude of RF signals on different parts of the RF circuit. It is a very useful test tool in the radio laboratory and usually has a direct current department with a direct current (DC) that isolates any DC from the resulting measured voltage. The RF probe can be used to test oscillators, receivers and transmitters. Amplifier class A or linear amplifier with a level without a signal or quiet DC at about half of the DC supply voltage creates an output that is a DC level with a overlapping alternating signal measured by RF probe to insulate the effect of the DC component. For example, a linear amplifier with a 12-volt (V) power supply can have a quiet DC output level of about 6 direct current volts (VDC). If there is no RF input signal, the output is pure DC, but even when it is DC, the RF probe meter will indicate 0 V. Once the RF input and the subsequent output, the RF probe meter can indicate the DC -related DC voltageRCHOLA RF signal.

Radiofrequency oscillation (RFO) is a very important part of RF receivers and transmitters. RF oscillators are circuits that generate RF locally on receivers, where they are referred to as RF local oscillators. In the broadcasts, these oscillators are referred to as RF generators. The RF detector can be a simple capacitor input circuit that has a high -frequency diode that acts to shorten the negative cycle and at the same time allow the positive part of the RF cycle to achieve the DC measuring circuit. This results in a DC voltage with an average level that is approximately equal to the level of the peak of the RF signal.

RF detector can be a RF rectifier that simply produces the top level of the RF signal. RF amplitude carrier (AM) has an average level of peak, which is proportional to the news. Using RF rectifier as a RF AM detector can be reproduced. There is a very small passiveThe circuit that uses a wire antenna connected to a simple RF diode as an AM detector, which includes a resistor and a capacitor to shape the result as a low power sound. With the headphone, the result is a simple receiver without active parts and this passive receiver only works when there is a strong AM carrier in the area.

Electronic test devices use different types of RF probes. The oscilloscope depicts the periodic course on a two -dimensional screen with an amplitude on vertical and time level on a horizontal axis. For oscilloscopes, a high impedance RF is used to ensure that the test device does not change the measured signal.