Satellite antenna feedforward, feedback correcting feedback inverting and amateur production ----- The Use of Satellite Antennas

Extremely light HF antenna, HF Antenna Keywords: HF antenna production Be VR2GY has two main interest activities, and the author has not changed many years, which is (1) hiking climb (2) amateur radio station communication. In the 27MHz generation, it is often often in Hong Kong's famous mountains, and has a call of 8 feet 10 inch antennas, call the call at the time of Kaohsiung, Vietnam Saigon, Macau and the world's 27MHz enthusiasts. Since there are of course no current no-liquid batteries, you can only use a large pool with large weight, so you need to minimize the weight and volume of other equipment to facilitate field operation. And the antenna aspect is an open knife. After a variety of method tests, there are many types of antennas, and there are advantages and disadvantages, but the tape measure is more convenient in light. When we test the HF antenna, we often measure the size, and the most convenient tool is the tape measure for decoration of woodworking, which is made with a flexible metal sheet, which is printed above. The length is 1 meter, 3 meters, 5 meters more common, pulled out and locks in the need for the length, and it will automatically retract the small box. There is a test 27MHz Wire Dipole antenna, there are many metal objects around, due to insufficient experience, cutting from cutting and reducing the antennas to achieve SWR to achieve the ideal value. (In fact, this antenna will also change it when the antenna will be changed. During the test, since the tape measure was used multiple times, it reminded that this tape measure is a metal body, or it can be used as antenna, and the elongation is very convenient. There is also a scale above, the price is still cheap. To do it, you will do it, so I immediately go to the tool shop to buy a tape measure for the same brand to do the two poles of the Dipole antenna. The effect is good. When it becomes a ham, the square tape test has been used for 7, 14, 21, 28mHz antenna, and the situation is also ideal. You may wish to try. However, the metal piece of the tape measure is brittle, and the wind resistance is also large. It is not suitable for the permanent antenna, and the length is problematic when it is less than 14MHz, it is best to use nylon rope.

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