Field Strength Meter Circuit

To use turn on transmitter and meter.

Field strength meter circuit. This circuit can be used to detect magnetic field strength of radio signal and common radio transmitting signal through antenna. This circuit help us to. A field strength meter is actually a simple receiver. You re measuring field strength from a transmitting vhf antenna use a vhf an tenna on the field strength meter.

Start your measurements by using low transmitter power and a near minimum sensitivity on the field strength meter. This field strength meter uses an 1ma fsd ammeter dc and indicates the radio magnetic field strength between 0 to 1ma scale range. When measuring with a field strength meter it is important to use a calibrated antenna such as the standard antenna supplied with the meter. Most modern fs meters have af and vf circuits and can be used as standard receivers.

For precision measurements. The variable resistor on the field strength meter figure 3 the case circuit board and antennas for the field. A field strength meter is used to align an antenna to get the best possible gain to determine the transmitting range of radio controllers. It is commonly used by model airplane builders to check whether their transmitter are really transmitting the radio signal.

Adjust c1 for peak reading. The field strength meter is a useful instrument in its own right but it can be made more versatile. Simple field strength meter circuit is designed by using single transistor and few easily available components. It uses the popular analog devices ad8307 logarithmic detector amplifier used in many popular vna s coupled with an on board digital voltmeter that has been modified to compare small signal changes of about 0 7db.

Simple field strength meter circuit. Rf field strength meter circuit. After a tuner circuit the signal is detected and fed to a micro ammeter or in this circuit a digital voltmeter dvm. This simple circuit measures the strength of a radiated signal from a transmitter.

A sensitive and reliable rf field strength meter is an invaluable instrument in amateur radio and in radio controlled model area. A field strength meter is an instrument that measures the electric field strength emanating from a transmitter. The capacitor c3 and inductor l1 forms a tuned circuit to receive a particular frequency the frequency of your transmitter the diode d1 detects the signal and applies to the base of transistor q1 mpsa 18 the collector current of the q1 will be proportional to the strength of this signal and will be shown in the meter m1 in result the meter. The qrpguys digital field strength meter can detect rf energy over the vlf 500mhz range with sensitivities from 80dbm to 10dbm.

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. Some fs meters are also equipped with printers to record received field strength.