1PC EDC no blind area omnidirectional low noise floor short wave antenna base

Description

Jiaxing EDC no blind zone omnidirectional low-noise short-wave antenna base station horizontal oblique pull down V3 band inverted V antenna
model:
200W basic version
200W high version
100W basic version
100W high version
7M 14M 21M When trimming the antenna, first adjust 21MHz (that is, the first line from the balun), then adjust 14MHz, and finally adjust the 7MHz vibrator.
1. The communication quality of the positive V antenna is 5 stars-no need to trim: the reason is that the material is aluminum tube stainless steel sheet, the positive V is an omnidirectional antenna with two wings facing up, and each hole can be fixed with a metal plate to punch each frequency band You can fix a point independently to solve the natural resonance. Each time you set up the antenna, you only need to fix it according to the standard screw holes. The standing wave will not change much. The advantage is that the erection is simple and only need to fix a support point to complete
2. Winton antenna communication quality 3 stars do not need to be trimmed: the reason is made of flexible cords. The Winton antenna is a directional antenna based on two bands, so there will be two wings, one long and one short when the V is inverted. In order to be able to allocate the emission wavelength of each frequency point reasonably, a long line is needed to cooperate with it. The installation requires a lot of space, and the antenna impedance needs to be adjusted in conjunction with the antenna to reduce the standing wave ratio to reduce the risk of the machine because the resonance frequency is not in place and the standing wave burns the machine. Most of the transmitted power is consumed by the antenna to the actual antenna. There are not many signal sources left, and three support points are needed when setting up. The advantage is that the setting speed is fast and the randomness is strong, so the Winton antenna is suitable for temporary field setting up communication, and the communication quality and efficiency are relatively low
3. The communication quality of the trap antenna 4 stars needs to be trimmed-material flexible wire. Install the antenna upside down on the basis of the positive V antenna. The natural resonance can be adjusted independently for each frequency point. Since the antenna material is a wire and metal flexible wire, there is no way to fix the angle with a fixed metal sheet, screws, etc. like a positive V antenna, and it is inverted. It needs to cooperate with the ground wave reflection to complete the resonance. Different. The ground environment is different. So trim and adjust the line sequence according to the actual setting to fine-tune to the best resonant frequency point to achieve the effect of positive V. The advantage is that the setting space is relatively small, and each frequency point can be adjusted independently Resonance, relatively high efficiency, the disadvantage is that 3 support points are required for erection. Two support points are required for horizontal erection. After the erection is completed, it needs to be effectively adjusted and trimmed by a standing wave meter or talent.
Detailed antenna adjustment instructions:
Because many novice friends do not understand short-wave antennas, they will encounter many problems during installation and adjustment! Two of these issues are more prominent.
First, the height of the antenna:
More than half of the new HAMs believe that his family lives in dozens of high-rise buildings, so the height of the antenna is far more than 4-6 meters. Can the antenna be used directly on the floor? In fact, this is wrong. The height of the antenna is calculated from the ground or the floor from the starting point. On the ground, the ground is used as the basis. Of course, the height is calculated based on the floor. The horizontal pull between the two buildings is based on the ground. . Everyone must remember that it is impossible for the antenna to work properly on the floor.
Second, I do not know how to scan the resonance frequency of the antenna and trim the antenna:
As long as the antenna is installed correctly according to the instructions, the first thing to do after installation is to use the antenna analyzer or standing wave table plus radio to scan the resonance point of the antenna. The resonance point is based on the minimum point of the standing wave without the professional instrument Many HAMs are fixed at a frequency and repeatedly trimmed to measure at this frequency. For example, at 7.050 many people trimmed a section and then measured the standing wave, trimmed and measured again. This method is incorrect. . The correct method should be to scan the resonance points (minimum points of standing waves) of the four bands first, then record them, and then calculate the approximate trimming length.
When using a radio plus a standing wave table, first adjust the power of the radio to a minimum of about 5W-10W (this is safer for the machine). The mode is CW or FM. The step size is larger and the step size is 5K. ), Rotate the frequency while transmitting so that you can see a valley on the standing wave table, and the standing wave will change as the frequency increases or decreases. 14M and 7M can be scanned in the frequency range of 13-14MHZ 6-7MHZ, the scanning range can be wider, because the resonance point of the antenna with a trap is very sharp, so the scan must be careful, so that 100% can be scanned to the resonance point ( Minimum point of standing wave).
For example, when we trimmed the 40-meter band, we scanned 6.950 standing wave 1.3 6.900 standing wave minimum 1.1, 6.850 standing wave 1.3, then we probably calculated that if the antenna resonance frequency was increased to 7.050, it was still 150K, 7M 1CM resonance per trim The frequency is increased by about 60K. After this calculation, about 2.5CM of trimming can increase the resonance frequency to 7.050. When the actual trimming length is close to the frequency we want to work, be careful. Trim it bit by bit. The length is based on the actual (the above is just an example and does not represent the real parameters).
The purpose of pruning is to change the length of the antenna element. Lengthening the element will decrease the resonance frequency of the antenna, and shortening the element will increase the resonance frequency! The role of the notch is just equivalent to a switch, used to switch between different bands. The electrical length of the vibrator determines the resonant frequency of the antenna, and the height environment (electric field environment) of the antenna determines the impedance formed when the antenna naturally resonates. Therefore, the antenna has a erection height requirement, and it is not necessary to remember any erection! !
7M 14M 21M short-wave antenna Base station antenna, horizontal oblique pull inverted V Erecting height 2-6 meters can work normally
The total length is about: about 8 meters. The main vibrator adopts national standard high-quality BVR multi-strand ultra-soft pure copper cable, and the material is strong enough to withstand stretching! The four bands are completely natural resonance and do not need to be used in conjunction with natural adjustment. The screws are 304 stainless steel Screws, balun fully waterproof structure can be used for long-term outdoor erection. Main accessories: one balun; six vibrators; six adjustment wires; four coils; three insulating plates; two balun U-shaped fixing clips, instruction manual A copy.
The main vibration wire is replaced, which is stronger than the ordinary version. Corrosion resistance, UV resistance, oxidation resistance
Packing: 1PC
Warranty period: 120 days
On Apr-17-20 at 19:09:03 PDT, seller added the following information: