This schema was designed to assist the installation of TV antennas. The signal is monitored using a small portable TV set and this schema monitors the output of the TVs FM detector IC via a shielded lead. To initially calibrate the meter, adjust trimpot VR2 to zero the meter. Trimpot VR1 is a sensitivity control and can be set for a preset reading (ie, 0dB) or can be calibrated in millivolts. Rotating the antenna for a minimum reading on the meter (indicating FM quieting) gives the optimum orientation for the antenna.
Circuit diagram:
TV Relative Signal Strength Meter Circuit Diagram
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