User's Manual

Mechanical Assembling
3-2 Exciter EX21 Installation and Connections
Mechanical Assembling
To assemble the Exciter EX21, refer to the assembly drawing (900061), and complete the following
steps.
Assembling the LF
Antenna for EX21
The antenna frame consists of five separate segments, each with the following dimensions: two
pieces - 0.4m long, two pieces - 2.0m long, and one piece - 1.0m long. Each segment includes an
aluminum tube with an internal rubber hose. The segments are joined together using plastic
corners. The antenna cable (7-wire cable) runs through the rubber hose spacers inside the aluminum
tubes.
To assemble the antenna, do the following:
1. Starting with one side of the antenna frame that is beside the plastic enclosure (0.4 m segment),
place the corresponding rubber hose inside the aluminum tube, and run the antenna cable
through the rubber hose. Run the cable through a plastic corner, and secure the plastic corner
inside the aluminum tube using a rubber mallet.
2. Repeat Step 1 for each side of the frame, finishing with the last short segment (0.4m). You
should have a 1x2m rectangular aluminum frame with the antenna cable inside.
3. Terminate the antenna frame with the plastic base connectors.
4. Place the 90° brackets on each ends of the frame, and secure the frame against the plastic
enclosure using M6 screws, washers and nuts.
5. Connect the antenna frame to the LFA21 ground using the cable provided. Place one terminal
lug of the cable on the M6 screw and the other under one screw which holds the LFA21 board
in place as shown on the assembly drawing.
Note Always ensure that the ends of the antenna cable inside the plastic enclosure have at least - 110mm
respective - 360mm long. For more information, see the drawing 900061.
6. Use the self-drill screws (M3.5x9.5) to secure the 1 inch square aluminum tube in each corner
of the LF antenna frame, and to secure the 90° brackets against the aluminum tubes.
For tuning procedures refer to procedure 950031.