Forward Path Alignment, Before You Begin

STARLINE3

Forward Path Alignment

The following subsections describe procedures required to obtain proper forward path alignment.

Before You Begin

For proper forward path alignment obtain:

1RF output levels and tilts of all amplifiers

2RF input level for the amplifier being set up (from system design or as-built map)

3A carrier at the system’s highest frequency. It can be modulated or continuous wave (CW) and should be inserted in the headend at standard video levels. This carrier is used to simplify field set up.

It is recommended that you:

1Install the system design value SFE-*-*and a high value (20 dB or above) forward input pad before you install or remove the electronics chassis or activate the system.

Leave the forward input pad location open if a high value pad is not available. A more accurate forward input test point reading is achieved with a high value pad installed.

2Do not use wire jumpers to bypass the SFE-*-*location.

3Recognize that actual pad and SFE-*-*values may differ slightly from their design values. This is caused by factors such as walkout errors, worst-case data utilization during design and temperature variation from 70ºF.

4Secure the electronics chassis in the housing and torque to 18 to 22 in-lbs to facilitate heat transfer.

5Perform a bench alignment. Pre-aligning the amplifier response on the bench for system signature simplifies field alignment. (If the unit is bench aligned properly, only minor adjustments may be necessary in the field.)

6Field sweep the entire bandwidth of the amplifier in the field to correct frequency response for passive signature and roll-off.

7Close the housing in accordance with the instructions provided in the subsection Closing the Housing at the end of this guide.

Manual Gain Control

To adjust manual gain control:

1Verify that the electronics chassis is installed correctly.

2Ensure that there is continuity in the forward path by installing the design value SFE-*-*and design value input JXP-*B attenuator.

3Ensure that the drive control select jumper is in the MAN position.

4Use a signal-level meter to measure the high band-edge carrier-input-level at the input test point: 750 MHz = channel 116, 870 MHz = channel 136. This carrier should be at standard analog level, non-scrambled.

RF Amplifier Quick Start Guide

RF Amplifier specifications

Motorola RF Amplifiers are integral components in radio frequency applications, known for their reliability and superior performance across various telecommunications platforms. These amplifiers are designed to enhance the strength of radio signals for wireless communications, ensuring clear and stable transmission over longer distances.

One of the key features of Motorola RF Amplifiers is their ability to deliver high linearity. High linearity is crucial in reducing distortion in transmitted signals, which is especially important in applications like mobile communications, where signal clarity can significantly affect call quality and data transmission. This characteristic allows for greater efficiency and effectiveness in systems where multiple signals are present, such as in densely populated urban areas.

Another significant aspect of Motorola RF Amplifiers is their broad frequency range. These amplifiers can operate across various bands, from VHF to UHF and even higher frequencies, making them suitable for diverse applications ranging from public safety communications to broadcast services. The versatility in frequency response adapts to the needs of different devices and systems, making them a preferred choice for engineers and manufacturers alike.

The technology underpinning Motorola RF Amplifiers includes advanced materials and integrated circuit designs that allow for higher thermal efficiency and reduced power consumption. This is particularly important in battery-operated devices where energy efficiency leads to extended operational life. Additionally, the compact packaging of these amplifiers ensures that they can be easily integrated into a variety of devices without requiring excessive space.

Motorola also places a strong emphasis on durability and ruggedness in their RF Amplifiers. Many models are engineered to withstand harsh environmental conditions, making them suitable for outdoor installations and challenging applications. Their ability to perform consistently in extreme temperatures, moisture, and vibration enables deployment in critical infrastructure contexts like base stations and emergency services.

Moreover, Motorola RF Amplifiers typically include built-in protection features, such as thermal shutdown, over-voltage protection, and automatic gain control. These safeguards enhance the longevity and reliability of the amplifier, reducing the need for maintenance and offering peace of mind to operators who rely on these systems.

In conclusion, Motorola RF Amplifiers are characterized by their high linearity, broad frequency range, energy efficiency, and rugged durability. With advanced technologies and features that ensure optimal performance, they continue to meet the demands of contemporary wireless communication systems, solidifying Motorola’s reputation in the RF engineering field.