May, 1998ADC Custom 102 v1.0 (c) 1998 Scott Baxter9 - 35 Neutralizing AM Broadcast Re-radiation by using a Detuning Skirt nL and C in box are chosen for resonance at AM frequency and tuned to set up proper current and phase in skirt L = typically 25 -125 uH @ 6 amps –use non-corroding straps, not wire or braid, for all connections –make connections to L using clips to allow very sensitive adjustment C = typically 1000 pF to 3000 pF –vacuum-variable best, but $$$; fixed mica OK - at least 6 kV, 5 A nAM field strength meter measures residual current in tower leg to indicate degree of cancellation L and C connections carefully adjusted to achieve resonance and then to minimize residual current Detail of Tuning Box Tower Leg L C Feed-through Insulator Skirt Wires AM Field Strength Meter inductive coupling
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