Graphic analysis: all hand-made peeling antenna

The stripping antenna is an antenna that is easy to take, simple to manufacture, and easy to carry. If you can find a coaxial cable and an antenna plug for your radio, we can do it. It is important that the coaxial cable can use the feeder for CCTV, and the quality is better. The quality of CCTV feeders is uneven. There are three main points to choose. One is that the shielding net should be dense. The second is that the wire should be thick, but considering the ease of use, the wires of 75-5 and 75-7 can be used. The third is the line. The conductor materials should be easy to solder. Now many manufacturers use cheaper but less tin-welded materials to produce the feeders in order to save costs. Therefore, apply the soldering iron to test welding beforehand, and see if it can be used. If the antenna is done well, the result will not be welded. The antenna plug depends on your radio interface.

The following is the structure of the antenna:

The first step: take a length of coaxial cable, the length of the cable will be the total length of the antenna plus the feeder, you can stay longer.

Step 2: Measure the position of the quarter-wave from one end of the feeder. The wavelength (m) is equal to 300/frequency (MHz). In theory, it should be multiplied by about 96% of the shortening parameter. However, considering that the reservation is made longer, it is not necessary to shorten the parameter. For a 145MHz antenna, the position to be measured is: 300/145/4≈0.52m; for 29.6MHz, it is: 300/29.6/4≈2.53m; the length of other bands can be used to calculate the frequency. come out.

Step 3: Cut the cable sheath ring at the quarter-wavelength measured in the previous step, taking care not to injure the cable.