In this tutorial, we are going to demonstrate a project Field Strength Meter in detail. In general, The field strength meter is a signal receiver. Therefore, a sensitive and reliable RF field quality meter is a significant instrument in mature radio and the radio-controlled model region. Moreover, a field strength meter utilizes to adjust an antenna to get the most ideal increase, to determine the transmitting range of radio controllers. Some FS meters can likewise get satellite (TVRO and RRO) frequencies.
Nowadays FS meters have AF and VF circuits likewise utilizes as standard receivers. Some FS meters are additionally outfitted with printers to record got field strength. The field strength meter circuit is a valuable device for estimating the RF output of any transmitter specifically experimenting with different antennas.
Hardware Components
The following components are required to make Field Strength Meter Circuit
| S.No | Components | Value | Qty |
|---|---|---|---|
| 1 | Antenna | – | 1 |
| 2 | Germanium Diode | OA91/1N60 | 2 |
| 3 | Ceramic Capacitor | 0.01µF, 0.047µF, 470pF | 1, 1, 1 |
| 4 | Variable resistor | 47K | 1 |
OA91/1N60 Pinout
For a detailed description of pinout, dimension features, and specifications download the datasheet of 1N60
Field Strength Meter Circuit
Circuit Operation
Crafted by the field strength meter (FSM) changes over RF power into DC voltage certainly. And this DC voltage can likewise effectively be coherent with a digital multimeter meter (DMM).
Furthermore, changing RF power to DC voltage is performed by OA91 Germanium Diodes. On the web, there are many field strength meter schematics however the majority of them are utilizing batteries yet the beneficial thing about this circuit is that it is battery-less and it is likewise enough delicate. Ensure that the digital multimeter ought to be determined to be 200mV while checking any transmitter or antennas. Be that as it may, you can likewise build it to 1000mV or more if the RF yield of the transmitter is solid. The frequency data transfer capacity of this circuit is tremendous yet I have only tried it on the VHF band.
Applications and Uses
The FSM arrangement of field strength meters is perfect for the accompanying applications:
- You can find directions by utilizing a directional antenna.
- Propagation study or mapping of radio frameworks including analog and digital frameworks.
- Measurement of an antenna performance of a mobile phone or two-way radio.
