K4EDF end-fed antenna HAM four-band SDR shortwave antenna

Description

K4EDF end-fed antenna HAM four-band SDR shortwave antenna
Description
Function:
The latest upgraded version of the vibrator uses a 2.5 square MM multi-strand pure copper wire vibrator to further improve the working bandwidth and tensile strength! Low standing wave working bandwidth is wider! And free 15 meters of outdoor special drawstring.
Novice notice: This is only the price of a pair of antenna and supporting 15-meter pull cord as all components, not including the feeder, and the feeder needs to be purchased separately. Remember!
The K4EDF vibrator resonates naturally at a half-wavelength in the 20-meter-length 40-meter band, naturally resonates at one wavelength in the 20-meter band, naturally resonates at a half-wavelength in the 15-meter band, and resonates naturally at two wavelengths in the 10-meter band (with gain). The radiation efficiency of the vibrator is unmatched except for the higher gain of the multi-unit Yagi.
K4EDF is a four-band end-fed antenna. The advantage is that compared with other types of antennas, it has a very wide working bandwidth (refer to the measured SWR graph). It can be naturally resonated from the ground 1 meter above and we need to work. Frequency. And the height change will not have a great impact on the resonance point, so basically it can be used without trimming, and the 40-meter band works at half a wavelength, the 20-meter band works at one wavelength, and the 15-meter band works at 1 half-wavelength. Working, the 10-meter band works with two wavelengths. The four waves are all naturally resonant and have a gain. The radiation efficiency is still very high. It is very suitable for an antenna for beginners (no trimming). The disadvantage is that the matching method is to use a high-ratio conversion balun. The heat loss is relatively large due to the turns ratio and magnetic flux density and the upper limit of the magnetic permeability operating frequency. Therefore, this antenna is very suitable for beginners to use (not suitable for long-term continuous transmission. , Suitable for interval sending and receiving), amateur band SDR reception. There is no problem in receiving broadcasts, and it is also suitable for broadcast fans. The custom-made magnetic ring currently used reduces the loss to the lowest limit. The actual test uses 100W SSB to continuously transmit for 30 minutes and pass safely! (The normal test balun only needs 10 minutes to continuously launch and the temperature rises normally to pass), we all pass the super violent test to pass!
Main parameters: 7MHZ 14MHZ 21MHZ 28MHZ four bands, standing wave less than 1.5, withstand power 100WPEP, balun insertion loss less than 1.5DB, vibrator adopts 2.5 square MM pure copper stranded wire (anti-ultraviolet can be used for long-term outdoor installation in all weather), antenna The total length is about 20 meters.
Erection method: horizontal, oblique pull, vertical can be (refer to the antenna erection diagram).
K4EDF is a supplement for base antennas that cannot be erected on the roof of a building. We will never give a false description of the test specifications of the antenna, let everyone know about it and make a choice!
Package included:
1 x
NEW K4EDF end-fed antenna HAM four-band SDR shortwave antenna
If you have any questions, please contact us in time, we will help you deal with the problem for the first time.
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