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tuning capacitor and coils for each band as H.J. Siegel, they attach the antenna to a balun and use coax to connect the antenna to the tuner. H.J. Siegel originally designed the antenna for 4 bands, 80, 40, 20 and 10 meters.
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.
22 wrz 2013 · The modified W3EDP is definitely a multi-band antenna. However, an antenna tuner capable of matching a wide range of impedances is required. A 4:1 balun will definitely help with impedance matching. Undoubtedly, some autotuners will have difficulty handling the impedances presented by the antenna.
20 lip 2009 · Clearly, the W3EDP/MFJ-901B antenna system was not the ideal all-band antenna system. The arrival of the LDG Z-11 QRP Autotuner changed everything. The Z-11 easily tunes the W3EDP on 10, 15, 20, 40, and 80m through the homebrew 4:1 balun.
23 cze 2006 · Well, I’ve stumbled across something that may work—the W3EDP antenna. 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.
The W3EDP end fed wire antenna lends itself readily to QRP and portable operation. A simple matching unit is needed to couple the wire to the rig and a counterpoise is required for some bands, however there is room for experimentation here.
Figure 7: The Zepp antenna with tuning capacitor and unfolded transmission-line section. The first published amateur radio End-Fed appears to be the one by W3EDP from 1936. It is a regular multiband end-fed for 160-80-40-20-10m (there were no WARC bands in those days).
