Encyclopedia of radio electronics and electrical engineering / Civil radio communications
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Schematic diagram of the S-meter and level indicator is shown in the figure.
The control signal of the S-meter is taken from the microcircuit MS2 of the low-frequency unit U4, which includes the sensor amplifier "CHANNEL" and the detector, the voltage of which is used in the radio station to open the key of the indicator of the call and signaling unit. This voltage through the quenching resistor R1 and the diode VD1, which serves to prevent the positive voltage from the power level indicator detector (VD2) from entering the MC2 microcircuit, is fed to the PA1 microammeter. The transmitter output power level indicator consists of a sensor L1 (two turns of insulated wire around the antenna terminal), a detector VD2, a smoothing capacitor C1 and a quenching resistor R2.
Microammeter RA1 - M476 / 3 with a total deflection current of the arrow 100 μA (from the tape recorder "Romantic-3"). The power indicator detector is mounted directly at the antenna output, and the R1 and VD1 elements are installed on the board of the low-frequency unit U4 from the side of the printed conductors. The RA1 device is installed in the control panel block A4. The communication line with the microammeter RA1 is carried out through the available free contacts 10, 11, 12 of the control panel connector Ш1.
The establishment of the indicator is as follows: if, when receiving powerful stations, the arrow of the PA1 device goes off scale, then you should select a resistor R1 of greater resistance. When the arrow goes off scale during transmission, similar actions should be performed with the resistor R2.
Diode VD1 can probably be excluded from the circuit, but since the author does not have an internal circuit diagram of the MC2 microcircuit, he had to be installed (to play it safe) in order to avoid unpleasant surprises.
Author: Vladimir Rubtsov (UN7BV), Astana, Kazakhstan
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