End-feed 150w PEP HF Antenna 5 Bands 3.5/7/14/21/28MHz Resonance without Adjustments
Black Widow END-FED Antenna with power handling of 150w SSB and 100w on Digital modes like FT8! Covers 80/40/20/15/10 Bands.
This antenna is Black Widow certified, it passed our quality expectations and efficiency test. Designed by hams and made by hams!
Description: Total lenght is about 130 feet (36.9m)
How can it be called a long wire antenna? Do you just pull a thread? Do not! Strictly speaking, that's just. The name of the antenna should depend on the operating frequency. If the length of the antenna is exactly half the wavelength, it is called a Ziber antenna, also called a terminal-fed dipole antenna. An antenna whose length is greater than one wavelength is called a long-line antenna. A more strict definition can be summarized as: an antenna whose length is greater than one wavelength and an integer multiple of a half-wavelength can be called a long-line antenna. So when we use the same antenna to work in different frequency bands, the name of the antenna is different? For convenience, we call the antenna that works in the low frequency band as a long-line antenna.
It is designed with M connector. Large magnetic ring (loss is minimized) plus PCB are used to fix balun.
Antenna erection:
The requirements for erecting the antenna are very low. As long as it is more than 1 meter away from the ground, it will work normally. However, in order to achieve the desired effect, it should be as high as possible.
When the antenna is 1-2 meters away from the ground or close to other objects, the resonance point will be slightly higher. When the antenna is vertically erected, the angle of the elevation is low, which is equal to the omnidirectional antenna. When the erection is horizontal, the elevation angle is relatively high. There is also a certain direction. The specific erection method can refer to the following figure.
Antenna adjustment:
Because the feeder and the erection environment will also affect the resonance point, the antenna will be slightly longer when the antenna is shipped, that is, the resonance point of each band may be low. When you set up the antenna, please perform the standing wave (resonance point) test to 7 trillion. As a benchmark,
Measure 7.00M, 7.05M, 7.10M, 7.15M. Find the resonance point (that is, the lowest standing wave frequency). If the assumption is 7.00M, the resonance point is low, and the length of the vibrator should be shortened. -3cm or so) until the resonance point is around 7.03M or according to your usual frequency, this antenna uses the principle that the four bands are multiples to realize the resonance of one vibrator at the same time, so the resonance point of its four bands is Linked,
Assuming that the resonance point is at 3.5mhz, 7.03M, the other bands are around 14.180, 21.250, and 28.500. On the contrary, if the resonance point is too high, the vibrator should be lengthened.
