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"V" Dipole Antenna
On Mar 22, 11:29*am, "Tam" wrote:
"Buck" wrote in message ... On Thu, 20 Mar 2008 13:34:40 -0700 (PDT), WB8YKH wrote: There is much literature on the inverted "V" antenna but I've found nothing on a "V" Dipole Antenna. *Can someone help me with resources or information on installation and effects of a "V" Dipole? *In my current location I am unable to raise my center point much more than 15 feet off ground. *However I can raise the endpoints 30+ feet. Before I go through much effort on the install I'd like to know what kind of performance I can expect. *Thank you for your insights! 73 WB8YKH My first thoughts are that instead of a 75 ohm antenna, you will now have one closer to 50 ohms. *It may have an unnoticeable loss figure due to the shortened length between the ends of the antenna, and if you tune it to a higher frequency (tune, not trimmed in length) you may find it more of NVIS, for example, a 40 meter v-pole might be almost equivalent to a dipole, but on 15 meters, it would point strait up. Question: *can you pull the legs through an insulator or something so you have hanging legs instead of a drooping center? * * _________| |_________ * *| * * * * * * * * * * * * * * * * * * * * * | * *| * * * * * * * * * * * * * * * * * * * * * | * *| * * * * * * * * * * * * * * * * * * * * * | -- 73 for now Buck, N4PGW www.lumpuckeroo.com "Small - broadband - efficient: pick any two." If you have horizontal room, you can do somewhat better. Put insulators on the ends, and pull out the ends so they go down at 45 degrees, or something, rather than hanging straight down. I am doing this on a 75 meter dipole that is supported by two 80 foot trees that are 60 feet apart. The antenna looks somethging like an upside down W. Tam/WB2TT- Hide quoted text - - Show quoted text - N4PGW and WB2TT - Your responses were very interesting to me and certainly worth my try. Yes, with my low center feed on the bazooka coax dipole I can drop the ends to form an "M" shape. Do you know how the radiation pattern would be effected? WB8YKH |
#2
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"V" Dipole Antenna
"WB8YKH" wrote in message ... On Mar 22, 11:29 am, "Tam" wrote: "Buck" wrote in message ... On Thu, 20 Mar 2008 13:34:40 -0700 (PDT), WB8YKH wrote: There is much literature on the inverted "V" antenna but I've found nothing on a "V" Dipole Antenna. Can someone help me with resources or information on installation and effects of a "V" Dipole? In my current location I am unable to raise my center point much more than 15 feet off ground. However I can raise the endpoints 30+ feet. Before I go through much effort on the install I'd like to know what kind of performance I can expect. Thank you for your insights! 73 WB8YKH My first thoughts are that instead of a 75 ohm antenna, you will now have one closer to 50 ohms. It may have an unnoticeable loss figure due to the shortened length between the ends of the antenna, and if you tune it to a higher frequency (tune, not trimmed in length) you may find it more of NVIS, for example, a 40 meter v-pole might be almost equivalent to a dipole, but on 15 meters, it would point strait up. Question: can you pull the legs through an insulator or something so you have hanging legs instead of a drooping center? _________| |_________ | | | | | | -- 73 for now Buck, N4PGW www.lumpuckeroo.com "Small - broadband - efficient: pick any two." If you have horizontal room, you can do somewhat better. Put insulators on the ends, and pull out the ends so they go down at 45 degrees, or something, rather than hanging straight down. I am doing this on a 75 meter dipole that is supported by two 80 foot trees that are 60 feet apart. The antenna looks somethging like an upside down W. Tam/WB2TT- Hide quoted text - - Show quoted text - N4PGW and WB2TT - Your responses were very interesting to me and certainly worth my try. Yes, with my low center feed on the bazooka coax dipole I can drop the ends to form an "M" shape. Do you know how the radiation pattern would be effected? WB8YKH I haven't tried it with the ends hanging straight down, but mine is the same length as a regular dipole. EZNEC plot looks like a dipoles. Tam |
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