Installation . Motorola BLE100

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 desirable to have a full complement of channels available for balancing, you can adjust the BLE100 adequately with a limited number of channels.

You can install the BLE-HSG/15 on a messenger strand (aerial) or in a pedestal. The following subsections provide details on each application.

Aerial Installation

The housing is normally mounted horizontally below the strand without the electronics chassis 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 1.35 inches and the maximum length is 1.5 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

1.50” Max.

1.35” Min.

To install the unit:

7

8

1

2

3

4

5

6

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

Mount the housing, and torque the two 5/16-inch messenger clamp bolts (illustrated in

Figure 2-5) to 10 to 12 ft-lbs.

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

Tighten the center-conductor seizure screw using a Phillips-head screwdriver. An alternate method is to use a 3/16-inch socket and a torque wrench. The recommended torque is

12 in-lbs. maximum.

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

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

Remove the input pad (

JXP

-

IN

) to avoid damage to the hybrids.

Apply power to the unit and allocate a few minutes for warm up.

BLE100 Installation and Operation Manual

5-2

Installation

9

Check the voltage setting (jumper J1, Figure 2-6).

J1 position Description

LO

The voltage must be greater than 38 V as read with a true rms voltmeter or 42 V when using a conventional, average reading voltmeter.

HI

The voltage must be greater than 55 V when read with a true rms voltmeter or 61 V when using a conventional, average reading voltmeter.

10

Check the DC voltage. Verify that it is between 23.6 V and 24.4 V and re-install the input pad.

11

If necessary, rebalance the amplifier following the instructions in Section 3, “Amplifier

Setup.”

12

Check the tightness of the electronics chassis cover screws (10 to 12 in-lbs.) and electronics chassis hold-down bolts (18 to 22 in-lbs.).

13

Check the condition of the RF and weather gaskets and replace them if necessary. If needed, also apply a light coating of silicone grease.

14

Close the housing and use a torque wrench to sequentially and progressively tighten the housing bolts to a final torque of 6 ft-lb in the sequence specified on the housing cover and illustrated in Figure 5-2.

Figure 5-2

Torque sequence

4

2

6

IN

A

S

SE

MBLE

D

M E X I C

O

5

1

3

BLE100 Installation and Operation Manual

Installation 5-3

Pedestal Installation

Pedestal installation is similar to 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.

To mount the BLE100 on a pedestal:

1

Remove the two 5/16-inch messenger clamps and bolts located on the long side of the housing.

2

Locate the two 5/16-inch holes 4.0 inches center-to-center cast into the housing base.

3

Use the two 5/16-inch bolts to install the BLE100 to the pre-drilled pedestal mounting plate and torque to 10 to 12 ft-lbs.

BLE100 Installation and Operation Manual