 MW
@telus.net | Dipole set up question Dipole: Is one side (+) and the other (-) insulated from ground? (T configuration.)
Which performer better Dipole or whip and at witch spectrum? |
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 drjimPremium,MVM
join:2000-06-13
Long Beach, CA
kudos:3
 ·Verizon FiOS
| One side goes to the center conductor of the coax, and the other side goes to the shield of the coax, BOTH are isolated from ground.
Your other question has too many variables to properly answer.
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One man's Magic is another man's Engineering. |
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 John GaltForward, MarchPremium
join:2004-09-30
Happy Camp
kudos:5 | reply to MW
drjim  is correct...there are -many- variables.
That being said, horizontal dipoles are generally preferred over verticals as they have a lower "take-off angle" when supported at an appropriate height.
Also, most noise is vertically polarized, so the horizontal antenna helps reduce that to some degree.
And, since I'm being wildly general  ...horizontal below 30 MHz and vertical above.
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»www.archive.org/details/Meatpies_1984
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MW
@telus.net | reply to MW
Thanks for the help trying to understand the different setups. Horizontal Dipoles are isolated from ground and im assuming the vertical is grounded on the shield part.
Kinda thought the vertical would be more useful at higher frequency. Where I live I dont own the right to put up any antenna, but I may be able to get away with a close to ground vertical at home. As well, Im surrounded by two story buildings all around me. It may be better just to stay with mobile at my home location. Just trying to figure it out. |
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| reply to MW
said by MW :Which performer better Dipole or whip and at witch spectrum?
Vertical antennas with a good counterpoise are better for low angle DX and on the low bands (40, 80, 160) because you don't need to put them as high as say a yagi and they are easier to erect and support. In fact for topband I would say 99% of DXers use some sort of vertical, whether it be an inverted L, sloper or similar.
Ground mounted verticals need more radials than elevated ones. Typically 4 radials will work for an elevated vertical whereas you'll need 40-120 for a ground mounted one.
But there's really no one size fits all antenna.
For local contacts and the sweepstakes contest, you want a low dipole.
For DXing and DX contesting you want a yagi at an optimal height above ground (1/2WL at least), or a stack of them so you can choose the height at will or phase them. Or if you can get a vertical or phased verticals over salt water that will be nice as well.
Of course all of this is given space and the means to put up your antennas. Most hams don't have the space for their optimal antennas so they have to make compromises. |
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| reply to MW
said by MW :Thanks for the help trying to understand the different setups. Horizontal Dipoles are isolated from ground and im assuming the vertical is grounded on the shield part.
Verticals don't have to be grounded.
However, a good radial system will make a vertical work well. |
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MW
@telus.net | said by fifty nine:said by MW :Thanks for the help trying to understand the different setups. Horizontal Dipoles are isolated from ground and im assuming the vertical is grounded on the shield part.
Verticals don't have to be grounded. However, a good radial system will make a vertical work well. Thxs for the confusion. lol Try to get one answered and come up with 100 more 
radial system? »www.bencher.com/pdfs/00361ZZV.pdf
Maybe I should just stay out of radio, all my rig/setup would be good for, would be collecting lightning! LoL (theirs gota be a question in there some where) |
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