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Expectations for 135 foot dipole
On Dec 31, 4:01*pm, John Ferrell wrote:
I am helping to install a 135 foot dipole on a hillside for HF activity. The antenna will be at least 45 feet from the ground in any direction. I can believe EZNEC so far as the effects of ground on impedance. but I am at a loss when it comes to considering the patterns on the various bands. The ridge is about 200 feet from the antenna. This is for a club member who recently upgraded to General Class. Since the ridge is close to the same height and south of the antenna, I am guessing that the computed charts will be a good representation of the northern half of the antenna. NVIS should not change much. The terrain may work as a reflector for over the pole operation. I am afraid the antenna will be of little use to the south. I expect we will eventually need to do the best we can with an antenna on the top of the ridge. When the snow melts I will try to climb the ridge for a look-see. It will likely be difficult to install due the dense trees. Any comments, advice, suggestions etc. are appreciated! John Ferrell W8CCW just put it up, hook up a tuner if the radio doesn't have one, and have fun. you can spend all your time modeling trying to figure out what it may look like, but if you are limited on how you can install it you can't really control much anyway. an antenna laying on the ground works much better than one that is only in your computer! |
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