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4B100W Withstand Power 100W End-Fed HF Antenna Shortwave Antenna 7-14-21-28MHz Easy Erection
Specifications:
- Antenna model: 4B100W (meaning that 4-band; withstand power is 100W)
- Antenna configuration: 1 x end-fed balun; 2.5 square oscillator 20m/65.6ft
- 20m/65.6ft outdoor drawstring, storage bag, without feeder which needs to be purchased separately
- Input power: SSB, CW mode 100W (PEP), FT8, AM.FM.SFK mode below 60W
Package Included:
- 1 x Set of End-Fed Antenna
Note: Feeder line is not included, please purchase separately.
How To Put Up The Antenna?
The requirements for the erection of end-fed antenna are very low. It can work normally if it is more than 2 meters away from the ground. To achieve a desired effect, the antenna should be erected in a high and open place as much as possible. When the antenna is erected vertically, because of the low elevation angle, the communication distance is far, it is equivalent to an omnidirectional antenna now. When installed horizontally, due to the high elevation angle of the antenna, the communication distance is relatively short, and it also has a certain directivity. Refer to the figure below for specific erection methods.
Antenna Adjustment:
The antenna has been adjusted before delivery. If your feeder line and the installation environment may affect resonance points, it is recommended to perform a standing wave (resonance point) test when you set up the antenna. If the resonance point may be affected by your feeder cable or erection environment, use 7.05Mhz as the reference resonance point (that is, the lowest standing wave frequency point).
This antenna uses the multiplier relationship of 4 bands to realize the principle that one oscillator resonates 4 frequency points at the same time, so the resonance points of its 4 bands are linked. Assuming that the resonance point is at 7.05M, the other bands are about 14.250, 21.350, and 29.00. To change the resonant frequency, just change the length of oscillator (the length of the antenna oscillator can be adjusted) without trimming. Or adjust according to your usual frequency without trimming.
