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Element correction for through beem Yagi elements
Hi,
I am in the process of building a 4-Element Yagi to operate at 915 MHz. The design is as follows... Element Length Distance from REFL REFL 159mm 0mm DE 146mm 40mm D1 139mm 90mm D2 132mm 155mm Boom is 12.8mm OD square aluminium (1.6mm wall thickness) Elements are 6mm solid aluminium rod. The design was assuming that the elements were to be insulated from the boom but I am having trouble making small insulators to hold these in place. It would be simpler for construction if I could simply drill through the beam and weld the rods in place or connect via a screw through the centre of the beam. The correction factor formula I have found seems to be for insulated through-beam elements. Q: Is there a correction factor I can apply to enable me to construct the antenna in this manner ? Q: Does the Driven element need to be in the same plane as the other elements or can it be out of alignment (ie. If I use a small plastic enclosure to house the balun and make connection to the driven elements, the elements will not be in the middle of the beam but rather 5mm or so above the beam). Q: Is there an alternate design I could use that would be simpler to construct. (I am looking for around 7dB gain at low angle of radiation - point to point communications link). Feedline is 50 Ohm coaxial cable, power is less than 1 Watt. Hope I have given enough info to evoke some constructive advice, Thanks in advance for your help Regards David |
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