Power meter. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Measuring technology

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To reduce interference to radio stations operating on the air, when establishing transmitting devices, an antenna equivalent is used. It is easy to turn it into a transmitter output power meter.

A schematic diagram of a power meter for transmitting KB equipment is shown in Fig. 1. It consists of a load resistor R1, a voltage divider across resistors R2 and R3 (division factor 10). as well as a high-frequency voltmeter on the diode V1. Since the resistance of the resistor R1 is known, the power dissipated on it can be easily calculated using the formula P = U2 / R1. Here U is the effective voltage across the load.

As a load resistor RI, a TVO-60 resistor with a power of 60 W and a resistance of 75 ohms is used.

Table 1

It is placed in a brass case, which is a screen (Fig. 2).

A coaxial connector is installed on one of the walls of the case. Resistors R2 and R3 - TBO-0,5. If there is no TVO-60 resistor. then you can use a certain number of MLT-2 resistors connected in parallel. It is important that the total power is at least 60 ... 100 W, and the total resistance is 75 ohms.

The design uses an M24 microammeter with a total deflection current of 100 μA. Resistor R4 - MLT-0,5, capacitor C1 - KM.

Setting up a power meter comes down to calibrating a voltmeter. As a source of high-frequency voltage, you can use the GZ-41 measuring generator or a transmitter (transceiver). The signal is applied to the divider R2R3, and the resistor R1 is temporarily turned off. By controlling the RF voltage with an exemplary device, for example, VK7-9, the voltage is set corresponding to the upper measurement limit (it is calculated using the above formula). Selecting the resistor R4, set the microammeter needle to the last mark of the scale, and then, changing the input voltage. make a calibration table similar to that given in the text.

This completes the calibration of the power meter. The divider is connected to a load resistor and the power released on it is measured. In this case, it is desirable to compare the readings with the readings of an exemplary power meter, for example, MZ-3A. MZ-5A, etc.

Author:V. Skrypnik (UY5DJ), Kharkov; Publication: N. Bolshakov, rf.atnn.ru

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