In this tutorial, we are demonstrating a field strength meter circuit. A field strength meter is a valuable circuit to detect and quantify the RF signals and their strength. The field strength meter is really a basic receiver. The frequency range of the tuner is within the terrestrial broadcasting bands. Some FS meters can likewise get satellite (TVRO and RRO) frequencies.
Most FS meters have AF and VF circuits and can be utilized as standard receivers. Some FS meters are likewise outfitted with printers to record got field strength. The circuit that appeared here can be utilized as a wideband field strength meter and can also be utilized as a wideband RF detector.
Hardware Components
The following components are required to make Field Strength Meter Circuit
| S.no | Components | Value | Qty |
|---|---|---|---|
| 1 | Transistor | 2N4401 | 1 |
| 2 | Transistor | BC516 | 1 |
| 3 | Resistor | 10K, 2.2K, 1K, 680Ω | 1, 1, 2, 2 |
| 4 | Diode | 1N4148 | 6 |
| 5 | Diode | 1N34 | 2 |
| 6 | Antenna | 30 inches | 1 |
| 7 | Zener Diode | 3.3V | 2 |
| 8 | LED | – | 4 |
| 9 | Battery | 12V | 1 |
BC516 Pinout
For a detailed description of pinout, dimension features, and specifications download the datasheet of BC516
Field Strength Meter Circuit
Working Explanation
In this section, we are discussing the circuit operation of the field strength meter. The circuit is utilizing four LEDs, which will show the low, medium, high, and full signal quality indications. The working voltage of the circuit is 12 volt DC yet you can also work the circuit with 9 volts. For working with 9 volts basically remove D5 and D6 diodes.
It is imperative to utilize all LEDs from the same maker, same color, and type because there are some differences in brightness and other specifications of every producer’s LEDs because of which they won’t show equivalent results on the same milliampere and the circuit won’t show exact outcomes
Applications and Uses
There are various applications of a Field Strength Meter. A field strength meter is basically an instrument that is used to measure electric field signals. It is also used to adjust an antenna to get the best gain and to determine the transmitting range of radio controllers.
