Model 643

The Model 643 antenna is designed for applications requiring an antenna capable of handling both vertical and horizontal signal polarizations. The 643 allows broadband operation from 20 to 3,000 MHz for direction-finding (DF), 20 to 8,500 MHz for signal monitoring. Typical DF accuracy is 2 degrees RMS*. The 643 supports calibrated signal amplitude measurements over the full frequency range and includes built-in self-test (BIST) for automatic testing and verification of the antenna’s operational status.

Capture and locate both vertically and horizontally polarized signals.

The DF array in the Model 643 consists of nine dual-polarized antenna elements that are housed in a fiberglass radome. The radome includes broadband monitoring antennas and a broadband RF switch. In a spectrum monitoring system, the RF switch commutes signals from the DF elements to an external two-channel receiver and generates test signals for DF
calibration and automatic system test.