[Elecraft] AW: [QRP-L] Feeding the Halfwave Ant

[Peter Zenker]

 Steve,

IMO you will find more center feed halfewave antennas then endfeed halwaves
because at Home it is normaly not so easy to have the ATU directly to the
antenna without feeder line. Endfeed halfwaves with feeder line result in
high impedance coupling which is not so easy to handle.

If we talk about portable Antennas, here in Germany the endfeed halfwave,
coupled directly to the ATU has become  one of the most used portable wire
antennas ever. It´s efficiency is great even if it ends very near to ground
with it´s feeded side. We use what we call a "Fuchs Kreis" to tune it. (this
type of Antenna was described By Mr. Arwed Fuchs, an Austrian Radio Amateur
in 1928. The Fuchs Kreis actually is a halve wave parallel tuned Circuit,
the antenna is directly coupled to the High impedans top of it. To make it
multiband, we use 2 Torroids with tapped coils, a switcheable coupling
winding and  a variable capacitor (exactly the same as it is used in the ZM)
BTW, the Z-Match itself is also a tuned parallel circuit. The difference: it
uses a different coupling method and it tunes to frequencies the same time.

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If you are interested, you will find the complete manual of our Multband
Fuchs here: http://www.qrpproject.de/UK/fuchs_ant_.htm

It is great for backpacking because it is very small, it needs no feeder, it
needs no counterpoise and it gives a ton of preselection to your receiver as
well.

73 de Peter, DL2FI