High sensitivity field strength gauge ----- Field Stregth Analyzer

High sensitivity field strength, Field Stregth Analyzer Keywords: high sensitivity field strength This article introduces the field strength, the circuit is simple, and there is no change in the multimeter, and the sensitivity is high. The field strength instrument adopts the principle of first detection, the circuit is shown in the drawings. The circuit consisting of antenna Tx, diode D1, D2, and capacitor C1 receives a high frequency signal, and a DC voltage is generated after detecting. After V1, V2 is enlarged. Push the current table indication, adjust the base voltage of W1 control V2, and then change the indication of the current table to achieve the modulation sensitivity. When making, D1, D2 selects the detection diode 2ap7 (cutoff frequency. 1882.150MHz), V1 selected nutofin effect tube such as 3dJ6, 3DJ8, etc. V2 can be used with 9013 or 9014 (β>140), and the antenna is used in a small tie rod antenna. After the production is completed, the circuit should be placed in the shield to avoid external electric field interference. When using, the power supply and multimeter are connected, and the usage is rotated to 5mA gear, and the adjustment W1 makes the tablet need, because the antenna sensing signal is stronger, the smaller the pencilation is smaller. The radio was measured with this field strength.

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