Motorola BT100 operation manual Aerial Installation, Section

Section 5

Installation

The field installation procedures presented in the following subsections assume that the amplifier was previously tested and bench aligned. Cable power and RF signal must be available on the system. Although it is preferable to have a full complement of channels available for balancing, you can adjust the BT100 adequately with a limited number of channels.

You can install the BT100 housing on a messenger strand (aerial) or on a pedestal. The following subsections provide details on each application.

Aerial Installation

The housing is normally mounted horizontally below the strand, with the electronics chassis removed, to avoid possible damage during installation. Connections are made using standard pin-type connectors with a nominal center-conductor diameter of 0.067 inches. The minimum length of the center-conductor pin is 1.5 inches and the maximum length is 1.65 inches. Longer pins can extend past the center-conductor seizure mechanism and degrade the match. Extremely long pins can result in a short circuit.

Figure 5-1

Center-conductor pin length

1.65" Max.

1.50" Min.

To install the unit:

1Power down the cable before you install the housing. This avoids blown fuses, tripped circuit breakers, and possible personal injury.

2Mount the housing, and torque the two 5/16-inch messenger clamp bolts, located on the long sides of the housing (illustrated in Figures 2-5 and 2-7) to 12 ft-lbs.

3Form the customary expansion loops and make all cable connections according to system design.

4Tighten the center-conductor seizure screw using a Phillips-head screw driver. An alternative method is to use a 3/16-inch socket and a torque wrench. The recommended torque is 12 in-lbs. maximum.

5To avoid water ingress, ensure that aluminum connectors are torqued to the specifications recommended by the connector manufacturer.

6If previously removed, re-install the electronics chassis and fasten it to the housing with the six captive bolts. Torque to 18 to 22 in-lbs.

7Remove the input pad (JXP IN) to avoid damage to the hybrids.

BT100 Installation and Operation Manual