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December 21st 04, 07:16 PM
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AB2RC wrote: On 2004-12-21, wrote: I am a newbie wanting to set up a base station at my house on top of my tv tower. I am interested in building one myself. I have the capability to weld. I hope you are referring to welding antenna elements, and not building a tower by yourself Do the j poles have gain to them? Are they near the performance of a several element yagi? Gain over what? Asking about gain without providing a reference point is sort of useless. If memory serves me correct (and I do admit that my memory is somewhat porous right now) a j-pole will have about the same gain as a dipole over an isotropic radiator or 2.4dbi. A yagi would certainly have more gain over a dipole or a j-pole. Remember that a yagi is directional, and the j-pole is not. If you want to hit repeaters in more than one direction, you will need a way to rotate the yagi. Can I make a dual band antenna in each of these styles? Yes, google is your friend here. Do the copper j poles last many years? I sometimes have high winds and lots of rain. Plus, I dont like heights and only want to do this once. I have one that has been up for 3 years now. The only difference between now and when it first went up is that it is a darker color now due to weathering. It seems to be just as strong now as t was then. I would ideally like to reach a repeater about 70 - 80 miles away from me. That would depend mostly on how high up you can get the antenna (yagi or j-pole) VHF/UHF is line of sight. -- Alex / AB2RC Linux is user friendly, however it is not idiot friendly No, the tv tower is already up. I meant I can weld the elements. (Of course only if it is weldable material.) I was wondering if emt tubing would be a good choice? The antenna would be about 25 feet up. I had someone else tell me that a j pole does not work very well. Is this true? I can rotate the mast by turning the antenna rotor hooked to my tv down stairs. The only pain would be running down stairs every time I want to do it. What would you do in this situation? Can you get as good as or better performance building one yourself? |
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