NEW K4EDF End Feed Antenna Ham Four Band Antenna SDR Short Wave Antenna


The latest upgraded vibrator adopts 1.5 square strands of pure copper wire, with a length of 20 meters, further improving the working bandwidth and tensile strength! Low standing wave and wider working bandwidth! Balun screw vias are filled with glue, and the full waterproof structure can be erected outdoors for a long time

The product does not include feeders. The antenna has a total length of 20 meters and needs more than 24 meters to be erected!

Special note: the broadband and parameters tested by k4edf are only responsible for the four band end feed parameters of our store. Balun 100W SSB passes safely after 30 minutes of continuous transmission

K4edf oscillator is 20m long, 40m wave band resonates naturally at half wavelength, 20m wave band resonates naturally at one wavelength, 15m wave band resonates naturally at one half wavelength, and 10m wave band resonates naturally at two wavelengths (with gain). The radiation efficiency of the oscillator is unmatched except for the higher gain of multi unit Yagi, and the working bandwidth is the best among the natural resonant antennas

K4edf is a four band end fed antenna. Its advantage is that compared with other types of antennas, it has a very wide working bandwidth (refer to the measured SWR curve). It can resonate normally from more than 1m above the ground at the frequency we need to work. Moreover, the height change will not have a great impact on the resonance point, so it can be used without pruning. In addition, the 40m band works at half wavelength, the 20m band works at one wavelength, the 15m band works at one and a half wavelength, and the 10m band works at two wavelengths. All four waves are naturally resonant and have gain, and the radiation efficiency is very high, A very suitable antenna for beginners (no pruning). The disadvantage is that the matching method adopts high proportion conversion balun. Due to the problems of turn ratio, magnetic flux density and upper limit of magnetic conductivity working frequency, the heat loss is relatively large. Therefore, this antenna is very suitable for beginners (not suitable for long-time continuous transmission, but suitable for interval transceiver) and amateur band SDR reception. There is no problem receiving radio, and it is also suitable for radio lovers. At present, the custom magnetic ring reduces the loss to the minimum. The actual test uses 100W SSB to launch continuously for 30 minutes and pass safely!

Main parameters: 7MHz, 14mhz, 21mhz, 28MHz four band

Standing wave less than 1.5,

Withstand power 100wpep,

Balun insertion loss is less than 1.5dB,

The interface is m seat (sl16 female head)

The vibrator adopts 1.5 square mm pure copper multi strand wire (UV resistant and can be erected outdoors for a long time), and the total length of the antenna is about 20 meters.

Erection method: horizontal, cable-stayed and vertical. Antennas are required to be erected more than 2 meters away from the ground or floor. Balun and vibrator must be suspended in the air and cannot touch any object (including leaves), let alone directly bond balun on metal support rods, and more than 2 meters away from these objects. The balun position and tail of antenna must be more than 2 meters away from objects, Pull rope must be used at the position and tail of antenna balun (insulated pull rope, telephone line with iron core inside and conductor wire are not allowed).