User's Manual

Model 1150A DVOR
1-14 Rev. - November, 2008
This document contains proprietary information and such information may not be disclosed
to others for any purposes without written permission from SELEX Sistemi Integrati Inc.
1.2.3.4 Tuning Stub
Refer to Figure 1-10. The tuning stub is a line section made out of RG-214 cable with a connector on one end and
open at the other end. The function of the stub is to supply the needed capacitive reactance to make the point of the
stub attachment pure resistive.
1.2.3.5
Positioning Piece
Refer to Figure 1-10. The positioning piece is a length of RG-214 cable with a connector at each end. The purpose
of the positioning piece is to place the tuning stub at a point on the input line where the resistive component of the
complex impedance is equal to the characteristic impedance of the line (50 ohms). The length of the positioning
piece is factory selected for the frequency band of operation.
1.2.3.6
Pedestal
Refer to Figure 1-11. The pedestal is a 6061-T6 aluminum tube with mounting plates on each end. The pedestal
supports the Alford loop antenna and provides a conduit for the feed cable, balun, positioning piece, and tuning stub.
1.2.3.7
Radome
Refer to Figure 1-11. The radome is a fiberglass enclosure that protects the radiating elements of the antenna from
the weather and vermin infestation.
Figure 1-11 Antenna Pedestal and Radome Diagram