J
JasonW
Guest
Hello All,I am familiar with the Terminated Tilted Folded Dipole (TTFD) antenna, which has a non-inductive resistor (or resistor array) opposite the feedpoint to give it a broadband response over a wider frequency range. Unfortunately, the resistor or resistor array absorbs a lot of transmitter power.That got me wondering--since there are physically-short inductively-loaded "simple" dipoles, would a physically-short inductively-loaded folded dipole also work? If a tapped inductor were placed opposite the feedpoint, it would seem that such a folded dipole could be tuned to resonance over a wider frequency range. Also, being an electrically closed antenna (like a loop) would make the folded dipole less prone to static buildup than a "simple" dipole. A motorized screwdriver mobile antenna loading coil might be perfect for tuning the folded dipole.The inductively-loaded folded dipole could be fed with 300 ohm TV twin-lead or 450 ohm ladder line or with coax (with a 6:1 or 4:1 balun at the feedpoint, depending on the coax impedance and transmitter output impedance).If such an inductively-loaded folded dipole would work, can anyone suggest any formulas for computing the loading coil inductances for given folded dipole dimensions and frequency ranges?Many thanks in advance to anyone who can help. -- Jason