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I have tested the antenna from 6 m to 80 m with a coax length of 12 m H-155 and the IC-7400, the TS-590 and the TS-480SAT. The losses are negligible and the antenna is working quite well in the praxis. If you have matching problems you can change the length of the coax cable and try it again.
In the 1936 March issue of QST, Yardley Beers, W3AWH, described an antenna designed by his friend, Mr. H. J. Siegel, W3EDP. The design was based on the end-fed zep antenna as once trailed from Zeppelin Airships.
22 wrz 2013 · Figure-1b is a diagram of the original W3EDP antenna. W3EDP is reputed to have used over 1,000’ of wire to come up with the dimensions shown in Figure-1b. Wire L1 is 84′ long and attaches to one end of a parallel tuned tank. The distinguishing characteristic of the antenna is wire L2 that W3EDP referred to as a “counterpoise.” L2 was ...
FIG 3 - End-fed Antenna Designs • With an end‐fed antenna, longer is always better! Have 113 feet of lot depth but no anchor point in front yard. Possible antenna‐endpoint in trees in City greenspace behind the house. • Need to manage for feed‐line and common‐mode radiation.
The antenna is nothing more than a 25.9m end-fed wire tuned against a 5.18m counterpoise. The original configuration (Fig. 1) shows the antenna and counterpoise coupled via a link coil to the power amplifier (p.a.) tuned circuit.
The W3EDP multi-band HF wire antenna is popular among QRP enthusiasts because it is light weight and cheap. It is also used as a portable antenna for Field Days and other similar events. I decided to see if the W3EDP antenna could be optimized by adjusting the counterpoise lengths for each band. Figure-1 is a diagram of the original W3EDP antenna.
Any W3EDP‐like antenna can be viewed in three different ways: a) as a single wire end fed via a parallel line 1/4th its length, b) as an end‐fed wire with a single counterpoise 1/5th its length juxtaposed to its proximal section or c) as a wire antenna fed off‐center at 1/6th
