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Old April 29th 06, 09:49 AM posted to rec.radio.shortwave
Telamon
 
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Default QUESTION - Does a "Non-Resonant" Dipole Antenna work better {Benefit} when a Receiver is RF Grounded in the Shack ? ? ?

In article .com,
"RHF" wrote:

FWIW :

Starting with a Single Band Dipole Antenna :

First - Both the Wires of the Ladder Line / Twin Lead / Twisted Pair
are connected to "Antenna" HI-Z (500 Ohm) {Red} Terminal of the
Radio / Receiver.

Second - The Ground Wire is connected to the "Ground"
HI-Z (500 Ohm) {Black} Terminal of the Radio / Receiver.

For a "Receive Only" Shortwave Listening (SWL) Antenna
it works OK.

For use as a Transmitting Antenna then an Antenna Tuning
Unit (ATU) "Trans-Match" would be required.

SO... WHAT KIND OF ANTENNA IS IT ?

At the Top the Antenna has two Horizontal Arms that are
Part of the Wire Antenna Element.

The two feed-in-line Wires can be considered as simply
feed-in-line or as part of the Antenna.

David says that this is a Top Loaded Vertical.

I believe some refer to it as a Double Extended Zepp Antenna ?
http://www.dxzone.com/cgi-bin/dir/jump2.cgi?ID=7682

I tent to think of it as a Twin Inverted "L" Antenna -or-
opposing classic LongWire {Random Wire} Antennas.

WHAT WOULD YOU CALL THIS MISS WIRED DIPOLE ?


Sorry I misread your previous post.

Any time you have one element for the antenna and ground for the other
side of a radio input you have a common voltage mode antenna.

There are two basic voltage antenna types Marconi and Hertzian. The
Marconi is single element and ground common mode antenna. The basic
Hertzian is two elements and balanced making it a differential mode.

Depending on dimensions of the horizontal and vertical parts your
proposed antenna could be a top loaded vertical. Change the dimensions
and it could be an inverted L. Just understand that the mode the
antenna operates in does not change. The vertical portion can connect
to the horizontal section at the end, middle, or somewhere in between
and it still is a common mode antenna whatever the resulting shape.

Call it the RHF special.

--
Telamon
Ventura, California
 
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