Ericsson LBI-39128 manual Power Sensor Calibration, Unidirectional Power Sensors

Page 19

 

 

 

 

 

INSTALLATION

LBI-39128

 

 

 

 

 

 

 

 

 

 

 

ANALOG INPUT CHANNEL 1

 

 

 

 

1.

CHANNEL TYPE (0-13) =

3

 

 

 

2.

DESCRIPTION

=

TX01

 

 

 

3.

UNIT ID =

 

AI01

 

 

 

4.

MEASUREMENT

UNITS =

Watts

 

 

 

5.

ALARM

DELAY

(1/4 sec) =

3

 

 

 

6.

LOWER

ALARM

LIMIT =

0.0

 

 

 

7.

UPPER

ALARM

LIMIT =

125.0

 

 

 

8.

ALARM

REPORT TYPES (1,2,3,4) =

 

 

 

 

9.

ALARM

RELAY

NUMBER =

0

 

 

 

10.

CHANNEL ENABLE METHOD (0-5) =

0

 

 

 

11.

CHANNEL ENABLE THRESHOLD =

0.0

 

 

 

12.

ANTENNA CHANNEL =

AI025

 

 

 

ENTER ITEM NUMBER TO CHANGE,

 

 

 

 

"H"

FOR HELP MENU, "A" TO ABORT,

 

 

 

 

OR "E" TO

END PROGRAMMING THIS CHANNEL: _

 

 

 

 

 

 

 

 

 

 

Figure 19 - Analog Input Channel Screen Showing Antenna Channel Parameter

28.With the Setup Selection Menu shown on the terminal, type 1 (for item #1 - Return To Operation Select Menu) and press the Enter key.

29.The Operation Select Menu should then be shown on the terminal. Type 1 (for item #1 - Disconnect) and press the Enter key.

Calibration Screw

30.The “Disconnected - Hit Any Key To Connect” prompt should then appear on the terminal.

POWER SENSOR CALIBRATION

The power sensor provides a DC voltage output representing the power through it. This calibration method uses an in-line wattmeter to read the power going through the power sensor, a DC voltmeter to measure the DC voltage out of the power sensor, and a conversion table to simulate the PMU’s calculation of power from this DC voltage. This DC voltage is then adjusted (using the 20-turn potentiometer mounted in the power sensor) until the power read from the conversion table agrees with the power read on the power meter.

Unidirectional Power Sensors

Use the following procedure to calibrate the unidirectional power sensors used at the output of each transmitter. Start with the transmitter for channel #1. The location of the calibration screw is shown in Figure 20.

Figure 20 - Unidirectional Power Sensor Calibration Screw

1.Turn off the 12V station power supply for the transmitter.

2.Disconnect the coax (from the power sensor to the combiner) at the power sensor end, and insert an in-line wattmeter (make sure the wattmeter is rated high enough to handle the power from the transmitter).

3.Disconnect the power sensor cable from the phono connector on the power sensor, and attach the DC voltmeter in its place (center pin is positive). (An alternate method is to disconnect the power sensor cable at the PMU - see interconnection diagram at end of manual - and attach the DC voltmeter to the end of the cable.)

4.Turn on the 12V station power supply for the transmitter.

5.Manually key the transmitter using the switch marked “REM KEY”, or press and hold the PTT switch on a hand-held microphone plugged into the transmitter.

6.Measure the DC voltage on the meter, look up this voltage in Table 6 (V in volts) to get the corresponding

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Contents Installation & Operation Contents Table of Contents List of Figures and Tables Figures and TablesSpecifications SpecificationsLBI-39128 Application Software Proms VAX Site Controller ComputerPersonality Proms Site Controller Software Site Controller HardwareAddition from No PMU PMU HardwareApplication Software PROMs Personality PROMsParts Required ProcedureDB-9 M DB-9 F Trunking Card Upgrade from Old PMUAdaptation from Old PMU Initial POWER-UP PMU Programming Terminal SetupSoftware Initialization Sentry PMU REV 8.6 12/07/94 Time/Date/Password Antenna Mapping Unidirectional Power Sensors Power Sensor CalibrationBi-directional Power Sensors Final Check Monitor StartupPower Measurements AlarmsSWR Calculations Excessive Alarms Alarm ReportingTransmitter Alarms Antenna AlarmsPMU Model Channel PMU EnableSite PMU Enable ParametersOperation Antenna Upper Alarm Limit Transmitter Lower Alarm LimitTransmitter Upper Alarm Limit Antenna Lower Alarm LimitAntenna Power Alarm Limits Alarm Limit RE-CONFIGURATIONTransmitter Power Alarm Limits Alarm Limits As InstalledAntenna SWR Alarm Limit Channel Monitor Screen Time and Date AdjustmentDiagnostic Screens Alarm History Report ScreenAlarm History Report Site not Programmed Time Erase ALL Programming Software UpdatesAlarm Delay Adjustment Symptom Possible Causes Corrective Action TroubleshootingMaintenance Glossary GlossaryInterconnection Diagram PMU Interconnection Diagram Edacs Site Controller Cabinet

LBI-39128 specifications

Ericsson LBI-39128 is a comprehensive communication solution designed to meet the ever-evolving demands of modern telecommunications. It is renowned for its ability to enhance network performance while providing a robust framework for various communication technologies. This product primarily targets service providers, enabling them to maximize their operational efficiency and improve service delivery.

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In summary, the Ericsson LBI-39128 is a state-of-the-art telecommunications solution that stands out due to its support for multiple technologies, advanced radio capabilities, energy efficiency, automated management, and robust security features. Its design reflects the needs of contemporary service providers, allowing them to build and sustain high-performance networks that meet the demands of future communications.