A simple field strength meter ----- Field Level Meter

Keywords: field strength gauge circuit diagram Author: Shen Yongming The field strength instrument plays a very important role in the erection of the antenna, and the faddle of wireless transmitters plays a very important role, but professional field strength instrument circuit is complex, and the price is expensive. General enthusiasts are powerless. The author designed a simple field strength instrument (circuit as shown), which can be used for general wireless transmitting and receiving equipment debugging. Generally, the professional field strength instrument circuit uses a special broadband amplifier to enlarge the inspection, and then sent to the instruction instrument through a series of circuits, the indication of this method is high, but the circuit structure and adjustment are very complicated, and the author is designed This simple field strong instrument is a plan for DC amplification after first detection, and the circuit is simple, the principle is as follows: The circuit consisting of antenna Tx, diode D1, and capacitor C1 receives a high frequency signal, a DC voltage generated after D2, C2, and then passes after: BG1, BG2 amplifying, pushing the LED lighting indication, adjusting W, control BG1 The base voltage, thereby changing the strength of the LED, and achieves the effect of adjusting sensitivity. Although the sensitivity of the detector (the ratio of DC voltage and high frequency AC voltage of the input to diode), the high frequency voltage is reduced, but for the simple field strength, select frequency characteristics The detection diode, adjusting W, or can be detected, the frequency test upper limit of the strong gauge depends on the operating frequency of the diode D1 and D2. When making, the components are selected according to FIG. 1, where W can be used with a linear potentiometer with a power switch, so that the uniform attenuation schedule is drawn on the panel, and the power supply can select a 6V stacking battery. The antenna can be used with a small rod antenna of a pocket receptacle. After the production is complete, the circuit should be placed in the shield to avoid external electric field interference. When using, pull out the antenna, close to the electrical appliance, rotate the W button, and adjust the luminescence intensity of i.ed, and combine the number of markings in this time that the scale is located, it is estimated whether or not The field is strong. For example, whether the cordless phone works, the wireless remote control electric toy remote control handle is normal to transmit radio waves, etc., the use is good, simple and practical.

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