1PC 4B100w short wave antenna 4 band natural resonance 7,14,21,28M BH7JYR
Antenna model: 4B100W (meaning 4 band withstand power 100W)
Antenna configuration:
1, one end feed balun 1
2, the national standard 2.5 square vibrator 19.8 meters
3, 20 meters outdoor rope. If you do not have a feeder, you have to purchase it separately. We have a high quality feeder for sale.
4, input power: ssb, cw mode 100W, digital transmission below 80w, AM.CW.SFK mode below 50W
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 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.
Delivery volume: 25x15x13cm, delivery weight 0.9KG
Packing: 1PC
Warranty period: 120 days
