![]() Required characteristic impedance of the feeder Length of the terminating stub ℓ_Zterm = 1.229 ft Sum of all dipole lengths ℓₜₒₜ = 38.185 ft Log‑Periodic Dipole Array Calculatorĭiameter of the shortest element ⌀ = 6 inchĬharacteristic input impedance Zc_in = 50 Ω With these instructions and the junk I have on hand I could probably turn one out in an afternoon. You could also make the booms another 6" longer and attach to a plate to end mount the antenna. ![]() It says you need a a 1ft terminating stub a the rear of the antenna so you make the booms a little over 1ft too long and short them out 1ft from the rear of the antenna. I punched in 115Mhz for the low end and 470MHz for the high end and using the default settings it gave me reasonable dimensions for the elements and boom with 14 elements and a 3 1/2ft long boom. ![]() You could use 1/4" dia aluminum rods for the elements with a 1/4" through hole to fit them in the boom then drill and tap a 4-40 hole in each element about 3/4" from the end and put a screw through the boom into each element. The basic construction could be two square booms 1" wide running the full length of the antenna. Here is an online calculator that should work. Sounds like you really need a log periodic. ![]()
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