Rf Field Strength Meter Circuit Diagram

L1 480 khz to 2 4 mhz l2 2 4 mhz to 12 mhz l3 12 mhz to 40 mhz the antenna is made of 30 cm long metal rod.

Rf field strength meter circuit diagram.

How the circuit works. This circuit is another radio frequency rf field strength meter similar with our previous field strength meter circuit but with lower supply voltage only a single cell 1 5v battery. Adjust c1 for peak reading. This rf field strength meter has no absolute scale if we don t calibrate the scale using a standard instrument but the important thing for this.

To use turn on transmitter and meter. This is an exceptionally simple rf field strength meter circuit. The amplification can be adjusted by p1 and with s1 switch we can select three frequency ranges. Start your measurements by using low transmitter power and a near minimum sensitivity on the field strength meter.

The frequency is controlled by l and c. The circuit shown here can be used as a wide band field strength meter and can. Here is a very useful project schematic of a sensitive field strength meter circuit. The rf field strength meter circuit schematic.

The circuit use only one transistor mpsa18 as the active component. Here is the schematic diagram of this rf strength meter circuit. The main stage acts as a crystal recipient. You re measuring field strength from a transmitting vhf antenna use a vhf an tenna on the field strength meter.

Utilize a germanium locator diode like 1n34 yet aa119 is substantially more normal in europe a silicon one won t do. The signal strength meter display uses analog meter 1 ma full scale. Considering these factors a dual mosfet is used as an rf amplifier in this circuit.