Field Strength Meter Circuit Diagram

The amplification of ic1 a r4 p1.

Field strength meter circuit diagram. The telescoping antenna may be adjusted to its shortest length when working at 2 meters to keep the needle on the scale. It can be used from 2 meters to 160 meters. Start your measurements by using low transmitter power and a near minimum sensitivity on the field strength meter. You re measuring field strength from a transmitting vhf antenna use a vhf an tenna on the field strength meter.

Circuit diagram with parts list. The unit discussed here indicates by means of a chain of leds in logarithmetic ratios the strength of an electric field surrounding the unit. Adjust c1 for peak reading. The rf field strength meter circuit schematic.

A field strength meter fsm is a very useful circuit to detect and measure the rf signals and their strength. Simple field strength meter circuit diagram. This circuit is a simple field strength meter that chooses a specific frequency range. Considering these factors a dual mosfet is used as an rf amplifier in this circuit.

Here is the schematic diagram of this rf strength meter circuit. 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 uncalibrated rf meter is that it can display the changes of an rf field when we calibrate the antenna or. With the bridge out of balance currents flows to the meter through r3 the meter and the emitter collector junction of the transistor. The signal strength meter display uses analog meter 1 ma full scale.

Here is a handy field strength meter that can be used to check the strength of am radio signals the circuit is a very useful for those who assemble radio transmitters. The circuit use only one transistor mpsa18 as the active component. The variable resistor on the field strength meter figure 3 the case circuit board and antennas for the field. 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.

The inputs signal across the conducting discs is applied to the non inverting input of ic1. This field strength meter uses an 1ma fsd ammeter dc and indicates the radio magnetic field strength between 0 to 1ma scale range. Set the meter to zero by adjusting p1 before you turn on the transmitter. Simple field strength meter circuit is designed by using single transistor and few easily available components.

This circuit help us to. 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. The circuit shown here can be used as a wide band field strength meter and can the circuit shown here can be used as a wide band field strength meter and can.