Technical parameters of HF320A three-wire antenna:
1. Antenna type: HF320A2. Frequency range (MHz): 3.5 ~ 303. Rated impedance (Ω): 504. PER power (w): 2505. Wind resistance (km / h): 2106. Antenna length (m): 207. Antenna width (m): 0.658. Gain (dBi): 39. Packing weight (kg): 210. Standing wave ratio (VSWR): <2: 1
It has reliable performance and a communication distance of more than 3000 kilometers.
This is a full-band short-wave antenna with a working frequency of 3.5MHZ--30MHZ. It is suitable for you to work in the short-wave working frequency band (different frequency and frequency hopping).It is a government, military, and three defense , Fishery and other units commonly used short-wave base station antenna HF320A three-wire antenna is a short-wave wide-band (3.5--30MHZ) dipole omnidirectional non-blind zone base station antenna.It can maintain good communication in short distance, middle distance and long distance, so it is widely used in commercial fields, especially maritime. The base station antenna selected by Taiwan, fishery, meteorology, exploration, government, military and other units is a reliable and excellent fixed base station antenna and outdoor temporary base station emergency antenna. The HF320A three-wire wideband dipole no-blind zone antenna is completely different from the common wideband dipole antenna. It uses a unique three-wire dipole structure. The vibrator structure is double-loop. The radiation is higher than that of a single-loop dipole antenna (that is, a common wideband dipole antenna). The actual use effect is better than a cage antenna, a wideband dipole antenna, a Winton antenna, The shortened inverted V antenna, CP-6, stair antenna, T antenna, long line antenna, GP antenna, small loop antenna, etc. are all strong. The HF320A antenna has a gain of 3dbi --- 5dbi through simulation analysis. The performance in the operating frequency band is uniform, the standing wave is small, no sky tuning, and no ground network is required. The installation is simple and flexible. Communication, light weight (1.9 kg), stable installation status, good wind resistance, good resistance performance, fully meet the requirements of professional customers. The HF320A three-wire antenna can be installed in two ways (inverted V and horizontal cross-pull) to adapt to different uses.
1. Inverted ‘V’ erection ：
①. Inverted V erection is mainly used for omnidirectional 360-degree communication without blind spots and long-distance directional communication, and the communication distance can reach more than 2000-3000 kilometers. When the radius is 0-1000 kilometers and the operating frequency is below 12MHZ, there is no dead zone in the communication area. Therefore, it is often used as a central base station in a communication network, and can also be used for a local station to form a reliable communication emergency protection network. When the working frequency is above 12MHZ, the antenna also supports long-distance directional communication. The communication distance can reach more than 2,000 --- 3000 kilometers. The front of the antenna element is its radiation direction.②. Erection method: The recommended height is 6 meters --- 7.5 meters, the included angle of the antenna top is 10 --- 120 degrees (the smaller the included angle is, the closer the communication range is), and the tail is 1.5-2 meters above the ground. If communication is required within 1000 km, there is no restriction on the installation direction of the antenna. If more distance communication is required, it is advisable that the front side of the antenna face the communication direction. When hoisting, first fix the two terminals of the balun in the middle of the vibrator with an insulating rope, then lift it on the top of the pole, and tighten the two ends of the antenna according to a certain antenna angle, so that the vibrator is straightened obliquely. , Fixed to complete the installation.③. When setting up, please pay attention: the stainless steel cable vibrator should not touch the metal pole. When lifting, the balun should not be pulled. The balun cannot bear gravity and tension. The insulated wire should be pulled by the stainless steel cable vibrator at the 2 ends of the balun. , The stainless steel vibrator can withstand 300 kg of pulling force. The feeder should be fixed on the pole. At the distance of 3 meters from the ground, a coaxial lightning arrester should be installed on the feeder to ensure safe lightning protection. The yellow screws of the two ends of the yellow aluminum housing installed in the middle of the antenna (matched) must be rust-proof (you can apply thick butter only).④. The inverted V erection is suitable for the communication network of the central station to the substations in all directions to form a reliable communication network. It also takes into account both horizontally polarized and vertically polarized waves, and has a good communication effect on fixed stations using horizontal antennas, on-board stations using vertical whip antennas, and personal piggyback stations. Adaptation and application are very extensive.
2.Erection of horizontal cross-drawing method
①. Horizontal horizontal pull method is mainly used for long-distance directional communication, and the communication distance can reach more than 3000 kilometers. It is the main force of long-distance directional communication (taking into account short-range omnidirectional 360-degree communication without blind spots). The front radiating signal of the vibrator is strong, and there is a certain amount of radiation on the side (ordinary broadband and * -shaped dipole antennas seldom radiate in the lateral direction). At the same time, it has 0-300 km omnidirectional blind zone communication below 10MHZ. When horizontal cross-drawing is erected, the higher the height of the pole, the longer the communication distance. If the communication distance is less than 1000 kilometers, a height of 7.5 meters can be selected. If 1000 --- 2,000 kilometers of communication is required, the recommended height is 7.5--9 meters. If the communication distance is more than 3,000 kilometers, the recommended height is about 15-20 meters.②. When the antenna is horizontally stretched, the height will affect the signal radiation direction. When the antenna is erected at a height of 2 meters (lower), the transmitted signal is strong along the direction of the vibrator, and the pattern and direction at 7 meters (high) are exactly staggered by 90. This method is quick to set up and is mainly used for temporary temporary emergency communications outdoors. At an altitude of 7 meters, the signal direction is strong in the vertical direction of the vibrator (that is, the front), which is more suitable for long-range directional communication. There are no close-range blind spots in the elevated and low-elevation modes. Both far and near communication are taken into account.③. Horizontal cross-tensioning requires two vertical poles with a height of more than 7.5 meters. A pulley is installed at the top of the pole. After tightening the steel cables at the two ends of the antenna through the pulleys on the top, the antenna is pulled up and tightened to a horizontal state. . The feeder should be located at a distance of 3 meters from the ground, and a coaxial lightning arrester should be installed on the feeder to ensure safe lightning protection. The yellow screws of the two ends of the yellow aluminum housing installed in the middle of the antenna (matched) must be rust-proof (you can apply thick butter only).④. The horizontal cross-pull erection method radiates stronger in the wide direction of the antenna than in the narrow direction, which is suitable for point-to-point and point-to-surface communication. The height of the brackets on both sides is preferably 1/4 wavelength. (For example: F = 10MHz, the height of the bracket is about 7.5 meters).
