VHF field strength meter


Posted on Feb 5, 2014

This is a simple and low cost wide band VHF field strength meter. The field strength is measured by converting the radio signal to DC and measuring it. The RF signal will be picked up by the coil and rectified by the diode D1. Even a very small DC voltage is sufficient to alter the biasing of FET and it will be reflected in the meter as an indicati


VHF field strength meter
Click here to download the full size of the above Circuit.

on of the presence of a radio signal. The meter can be calibrated by adjusting the preset R2 to make meter M1 read ZERO in the absence of any radio signal. This circuit is not very sensitive, but can sense radio signals from hand held FM transmitters up to a distance of few meters( ideal for theoretical demonstrations).




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Digitally controlled FM transmitter with 2 line LCD display
    strobe light controller
    two transistor radio
    Shock alarm circuit
    SOS Alarm centralized control circuit
    XTR108 voltage excitation bridge circuit diagram
    One battery fast charge circuit



    Top