Motorola BT100 - Manual (Page 44)

BT100 Installation and Operation Manual
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:
1
Power down the cable before you install the housing. This avoids blown fuses, tripped circuit
breakers, and possible personal injury.
2
Mount 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.
3
Form the customary expansion loops and make all cable connections according to system
design.
4 Tighten 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.
5 To avoid water ingress, ensure that aluminum connectors are torqued to the specifications
recommended by the connector manufacturer.
6 If 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.
7 Remove the input pad (JXP IN) to avoid damage to the hybrids.