Motorola operation manual Pedestal Installation, Grounding the BT100

Installation5-3

Pedestal Installation

Pedestal installation is similar to the aerial installation with the exception of temperature and mounting procedure. In an aerial installation, the cable and amplifier are subject to the same temperature. In contrast, pedestal installation provides a stable temperature environment for the buried cable while subjecting the elevated amplifier to higher temperatures. The ADU/QADU, if installed, functions the same as in an aerial installation, and does not require further attention. See Section 3, “Amplifier Setup,” Amplifier Level Control for additional information.

Manual thermal compensation provided by the TDU can be inaccurate and result in signal level changes with ambient temperature change. One approach to this problem is to select the least amount of cable setting (low) on the TDU. This results in minimal gain change with temperature. A preferred approach is to install a JXP-TH*C thermal attenuator while operating the BT100 in the manual mode.

To mount the BT100 on a pedestal:

1Remove two 5/16-inch messenger clamp bolts located on the long sides of the BT100 housing.

2Locate the two 5/16-inch holes (Figure 2-7) eleven inches center-to-center cast in the lower housing.

3Use the two 5/16-inch bolts to install the BT100 to the pre-drilled pedestal mounting plate and torque to 10 to 12 ft-lbs.

Grounding the BT100

The BT100 housing requires a good earth ground to function properly. You can establish a good earth ground by one of the following methods.

For aerial metal-strand installations — the metal strand clamp normally provides adequate grounding. However, if additional grounding is needed, you may attach a wire from earth ground to a 5/16 x 24 bolt that is tightly secured to one of the pedestal mounting holes on the bottom of the housing base.

For pedestal installations — the BT100 should be adequately grounded by routine mounting to the pedestal. However, if additional grounding is needed, attach a ground wire to a 5/16 x 24 bolt and tighten it into one of the strand clamp holes.

BT100 Installation and Operation Manual