Acrartex ThunderBird SSAS User Manual download pdf (Page 9)

Y1-03-0180 Rev. D

3.3.4 Switch installation

Cut a 0.638” x 0.638” (16.2 mm x 16.2 mm) square hole in the selected panel. The recommended panel

thickness is 0.039” to 0.106” (1.0 mm to 3.2 mm).

The switch should be pushed back into the hole from the front. It is recommended to make the wire

connections before installing the switch into the panel. Connect the wires to the back of the switch; one

wire to “COM” terminal and the other to “N.O.” terminal. There should be no connection to the “N.C.”

terminal. The wires should be soldered to the switch terminals (see Figure 1). Once the connections are

made, make sure the spring-loaded switch guard is securely attached to the switch and press the switch

assembly into the panel hole. The switch will snap into place.

Repeat the above procedure for the other switch.

3.3.5 Connection to mounting bracket

Route the switch wire from the switch locations to the ThunderBird SSAS beacon mounting bracket. Care

should be taken to route and secure the wire properly. The wires should then be trimmed to the

appropriate length.

If using the recommended 16 to 22 AWG wire, crimp the terminal lugs (provided) onto the wires. If other

wire is used, appropriate lugs (Not provided) can be used. Alternatively, the wire can be connected directly

to the terminal block on the mounting bracket (see Figure 2). Connect one wire from each switch to one of

the two terminals on the top of the mounting bracket by placing the lug under the screw and tightening the

screw. Repeat with the other wire from each switch in the other terminal.

3.3.6 Switch installation verification

To verify proper installation of the switches, the following procedure should be followed (requires two

persons, preferably with 2-way radio communications):

Perform this procedure with all connections made between the switches and the beacon.

The beacon must be in OFF mode. Performing this test with the beacon in READY mode may result in

a live transmission to the satellite system.

With a multi-meter, measure the resistance between the two screws on the left side of the beacon.

This should be an open circuit (> 100 k .) If not, check the switch wire connections to make sure the

two wires from each switch are connected to different screws on the mounting bracket terminal block.

Depress each switch (one at a time) while measuring the resistance between the two pins on the

mounting bracket connector. The resistance should momentarily (as long as the switch is depressed)

read a short (< 10 .) If the resistance never reads a short, verify all connections are per 3.2.4 and

3.2.5 above.

3.4 Cross dipole antenna installation

3.4.1 General information

The cross dipole antenna is intended for operation far away from a ground plane. With this in mind, the

location of installation should be carefully selected to keep the antenna as far from horizontal conductive

(metallic) planes as possible (see Figure 12).

The length of cable from the SSAS beacon to the cross dipole should be kept as short as possible. Secure

antenna cable (3 ft. maximum) away from antenna to reduce stress on antenna connector (see Figure 12).

A stainless steel 4 inch tall antenna mount is included with your SSAS kit. If the supplied bracket is not

ideal for the desired mounting location, the cross dipole has a standard female 1” x 14 thread allowing it to

be mounted to a variety of off-the-shelf brackets and masts.

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Acrartex ThunderBird SSAS User Manual Page 9

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