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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.
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.
However, if you is to implement a W3EDP antenna, care should be taken to d.c. isolate the counterpoise system as described unless a Z-match a.t.u. is used. The W3EDP is an ideal antenna for temporary or portable operation, although it would also make a very effective all band system if sited in the open at a permanent location. PW Antennas ...
Chose H.J. Siegel’s (W3EDP’s) antenna from 1935 as modified by Bob Sharp (VA3QV) in 2010 because its an end‐fed wire antenna having multi‐band operating possibilities. The dimensions are 85 ft for main section and 17 ft for shorter section.
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 ...
