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    J-type FM launch antenna size ----- fm antenna

     

    The J-type antenna is called the "Slim Jim" antenna, which belongs to the vertical polarization antenna, which is widely used in the communications. It is characterized by a low radiation angle (about 0 to 10 °) and has a certain gain (about 3 dB), which is twice the efficiency of 1/4 GP antenna. There is a data show that the Horizontal radiation intensity of the SLIM JIM antenna will have many GP antennas than 5/8 wavelengths, and it can be seen that its advantages are very obvious. The part of the J-type antenna is a radiation section, and the bottom below is a matching section. Adjusting the impedance of J-type antennas is 50 ohms, which can be connected directly to 50 ohms. Due to its easy production, it is easy to make, and many HAM's favorite. See Figure 1: The method of the feed point: 50 ohm coaxial cable of the core wire of the cable to the edge feeder, the outer skin is connected to the short side feed point. Be Be The adjustment of the standing wave: the J-type antenna SWR is affected by the environment, and the position of the feed point must be adjusted in the actual installation position. It should be noted that some HAMs use a plastic hard tube sleeve on the antenna to protect it, which is active. However, due to the difference in hard plastic quality, it may affect the standing wave ratio, please pay attention in the application.

     

     

     

     

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