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The picture above shows the "new W3EDP antenna" which has an unsymmetrical wireman-feed ("Zepp") and a balun 1:4. At the end of the twinlead-feeder a feedpoint impedance in the range of 200-500 Ohm with some complex part +/-j X Ohm. The Balun 1:4 gives impedances, which can be matched by the built-in ATUs of the most transceivers.
22 wrz 2013 · Today, the W3EDP antenna is a favorite of many QRP (low power operation) aficionados because it is simple, compact, and easy to deploy. I decided to take a look at the W3EDP antenna as a possible multi-band antenna suitable for fixed location use and as an easily deployable portable antenna for events such as Field Days.
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.
23 cze 2006 · The W3EDP is an 85-ft. end-fed wire with a 17-ft. counterpoise. Of course, you need an antenna tuner to make this work, but I already have a tuner or two here. And, if you’re going to operate QRP, a small tuner is even pretty easy to build. Here are some links: QRP-L Archives and Articles.
Although the W3EDP antenna does not appear to have enjoyed the same popularity as some other multi-band antennas, its use can still be heard of on the Amateur bands from time-to-time. The W3EDP antenna is probably one of the simplest antenna designs around. The antenna is nothing more than a 25.9m end-fed wire tuned against a 5.18m counterpoise.
If you’re at a site calling for an end-fed antenna, the W3EDP may be the one for you. Rather than run the short wire off in an odd direction, slightly better performance results from configuring the two wires to produce an end-fed Zepp.
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 its length from ...
