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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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