| Quantity | 3+ units | 10+ units | 30+ units | 50+ units | More |
|---|---|---|---|---|---|
| Price /Unit | $55.11 | $53.98 | $52.29 | $50.04 | Contact US |
Hantek DSO1102B Digital Oscilloscope USB 100MHz 2 CH LCD Multimeter OSC Portable Automotive Logic Analyzer
$456.20
Hantek DSO5202BMV Digital Mutlimeter Oscilloscope USB PC Automotive Osciloscopio Portable 200MHz 2CH LCD Logic Analyzer
$484.72
ZOYI ZT102A Autoranging Digital Multimeter 600V CAT III & 1000V CAT II Automatic & Manual Modes
$19.92
End-Fed Antenna HAM Four-Band Shortwave Antenna SDR Shortwave Receiving Antenna K4EDF
Description:
K4EDF is a four-band end-fed antenna.
The advantage is that it has a very wide working bandwidth compared with other types of antennas (refer to the measured SWR graph). Normally, the natural resonance is more than 1 meter above the ground.
On the frequency. And the height change does not affect the resonance point very much, so it can be used without trimming, and the 40-meter band operates at half wavelength, the 20-meter band operates at one wavelength, and the 15-meter band at one-half wavelength. Working, the 10 meter band operates at two wavelengths, the four waves are naturally resonant and the gain radiation efficiency is still very high, very suitable for a novice entry antenna (without 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 ratio of the turns ratio and the magnetic flux density and the upper limit of the magnetic flux operating frequency. Therefore, this antenna is very suitable for beginners (not suitable for long-term continuous launching). , suitable for interval transmission and reception), amateur band SDR reception. There is no problem in receiving broadcasts, and it is also suitable for broadcasters.
The custom magnetic ring currently used reduces the loss to the lowest limit, and the actual test is safely transmitted with 100W SSB for 30 minutes! (Normal test balun only takes 10 minutes to continuously emit normal temperature and is qualified), we are all passed the super-strength violence test!
2.5 square MM multi-strand pure copper wire upgraded vibrator increases working bandwidth and tensile strength. Low standing wave with wider operating bandwidth.
It is designed with M connector. Large magnetic ring (loss is minimized) plus PCB are used to fix balun.
Parameters:
- Four-Band: 7MHZ 14MHZ 21MHZ 28MHZ
- Standing Wave: Less than 1
- Withstand Power: 100WPEP
- Balun Insertion Loss: about 1.5DB
- Vibrator with 2.5 square MM pure copper multi-strand line (UV-resistant for all-weather outdoor long-term erection)
- Length of Antenna: about 20 meters
- Installation Way: Horizontal Installation, Incline Installation and Vertical Installation 
Package Included:
- 1 x End Fed Antenna
Note: Feeder is not included in the package. Please purchase separately. Thank you!
