Portable 7MHz antenna production ----- 7MHz Antenna

Keywords: homemade short-wave antenna amplifier Homemade short-wave antenna amplifier This antenna amplifier is very simple, it can easily amplify signals from ring type antennas and longline antennas, and components are easy to find. This is a classic amplifier circuit that has appeared in 1970, there have been two versions, but the central part is almost the same, here is the standard version: Be Amplitude broadcast antenna amplifier The first version is provided with a 3PDT switch, not only as a power switch, but also as a signal through switch. This is useful in some places where strong stations can avoid overload of the receiver. The second version adopts an ferrite magnetic rod antenna, which has seriously affected the sensitivity, although the printing map is provided. I recommend using this amplifier to use a ring antenna, and T1 can be saved, and C1 can be used as a tuner of the ring antenna. When you use the long line antenna, you still need to retain T1. Any quality field effect tube can replace it, I use a microstrip package product. After the measurement, this amplifier has 40 dB gain, the biggest disadvantage is that the receiver will overload. Amplitude antenna amplifier

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