field strength meter circuit

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Simple field strength meter circuit2015-01-11 12:33 Declaration:We aim to transmit more information by carrying articles . We will delete it soon, if we are involved in the problems ofarticle content ,copyright or other problems.

This simple circuit measures the strength of a radiated signal from a transmitter. It is commonly used by

model airplane builders to check whether their transmitter are really transmitting the radio signal. Using this

FS meter, one can quickly determine whether the problem lies on the transmitter or the receiver module.

A single transistor T1 is the only active element in this circuit. The transistor is designed as a “controlled

resistor” forming one part of a balanced bridge circuit. The base of T1 is directly connected to the

receiving antenna. With increasing radio frequency voltage at the transistor base, the transistor conducts

and disturbs the balance of the bridge circuit. With the bridge out of balance, currents flows to the meter

through R3, the meter and the emitter-collector junction of the transistor.

How to use: Set the meter to zero by adjusting P1 before you turn on the transmitter.

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field strength meter circuit

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