User's Manual
Table Of Contents
- Contents
- Chapter 1 Introduction
- Chapter 2 Preliminary Operations
- Chapter 3 Optimization/Calibration
- Introduction to Optimization and Calibration
- Preparing the LMF
- Overview of Packet BTS files
- LMF Features and Installation Requirements
- LMF File Structure Overview
- LMF Home Directory
- NECF Filename Conventions and Directory Location
- LMF Installation and Update Procedures
- Copy BTS and CBSC CDF (or NECF) Files to the LMF Computer
- Creating a Named HyperTerminal Connection for MMI Communication
- Span Lines - Interface and Isolation
- LMF to BTS Connection
- Using the LMF
- Pinging the Processors
- Download the BTS
- CSM System Time - GPS & LFR/HSO Verification
- Test Equipment Set-up
- Test Set Calibration
- Background
- Calibration Procedures Included
- GPIB Addresses
- Selecting Test Equipment
- Manually Selecting Test Equipment in a Serial Connection Tab
- Automatically Selecting Test Equipment in the Serial Connection Tab
- Calibrating Test Equipment
- Calibrating Cables Overview
- Calibrating Test Cabling using Communications System Analyzer
- Calibrate Test Cabling Using Signal Generator & Spectrum Analyzer
- Setting Cable Loss Values
- Setting TX Coupler Loss Value
- Bay Level Offset Calibration
- Purpose of Bay Level Offset Calibration
- What is BLO Calibration?
- Component Verification During Calibration
- When to Calibrate BLOs
- BLO Calibration Data File
- Test Equipment Setup for RF Path Calibration
- Transmit (TX) Path Calibration Description
- TX Calibration and the LMF
- TX Calibration
- All Cal/Audit and TX Calibration Procedure
- Download BLO Procedure
- Calibration Audit Introduction
- TX Path Audit
- TX Audit Test
- Create CAL File
- RFDS Set-up and Calibration
- Alarms Testing
- Chapter 4 Automated Acceptance Test Procedures
Test Set Calibration68P64115A18–1
Mar 2003
1X SC 4812T Lite BTS Optimization/ATP Software Release R2.16.1.x
DRAFT
3-77
Calibrating Cables Overview
The LMF Cable Calibration function is used to measure the path loss
(in dB) for the TX and RX cables, adapters, directional couplers, and
attenuators that make up the cable configurations used for testing. A
communications system analyzer is used to measure the loss of both the
TX test cable and the RX test cable configurations. LMF cable
calibration consists of the following processes:
1. Measure the loss of a short cable. This is done to compensate for any
measurement error of the communications system analyzer. The
short cable, which is used only for the calibration process, is
connected in series with both the TX and RX test cable
configurations when they are measured. The measured loss of the
short cable is deducted from the measured loss of the TX and RX
test cable configurations to determine the actual loss of the
configurations. This deduction is done so any error in the analyzer
measurement will be adjusted out of both the TX and RX
measurements.
2. Measure the loss of the short cable plus the RX test cable
configuration. The RX test cable configuration normally consists
only of a coax cable with type–N connectors that is long enough to
reach from the BTS RX connector to the test equipment. When the
BTS antenna connectors carry duplexed TX and RX signals, a
directional coupler and, if required by BTS type, an additional
attenuator are also required for the RX test cable configuration.
These additional items must be included in the path loss
measurement.
3. Measure the loss of the short cable plus the TX test cable
configuration. The TX test cable configuration normally consists of
two coax cables with type–N connectors, a directional coupler, a
termination load with sufficient rating to dissipate the BTS output
power, and an additional attenuator, if required by the BTS type. The
total path loss of the TX test configuration must be as required for
the BTS (normally 30 or 50 dB). The Motorola Cybertest analyzer is
different from other communications system analyzers because the
required attenuation/load is built into the test set. Because of this,
the Cybertest TX test configuration consists only of the required
length coax cable.