4244-2 Adapter

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4244-2 Adapter

Adapter for 12-ft Antenna

The purpose of NVIS (Near Vertical Incident Signal) is to enable communications in the area commonly called the “Skip Zone or “Dead Area.” This is accomplished by tilting the antenna so that its main radiating lobe is 73° to 83° above the horizon. The higher radiating lobe causes the signal to bounce off the ionosphere, returning to the earth in the dead area that may occur 10 to 150 miles out when using the antenna vertically.

The HF band is home to the most effective frequencies for NVIS applications: 6 to 12 MHz. Shakespeare’s Model 120 system is NVIS ready. The antennas can be mounted on a base, such as Model 4289-W Spring Base, which has tilt features built in, or adapted by inserting an adapter between the antenna and the base. In either case, the High Voltage Protection Device can still be used. For information about NVIS using Tilt Whip adapters, contact Shakespeare.

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