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RF configurations

5th Feb 99

1–4

Service Manual Supplement: VSWR Monitor for M-Cell

6

68P02900W86-O

Multiple VM
configurations

If a sector uses two duplexers for both transmitting and receiving, then one VM will be
required for each Tx/Rx antenna, as shown in Figure 1-4.

VSWR Monitor

TX

TX

RX1

RX1

RX2

RX2

BTS sector

TX/RX

TX/RX

ANTENNA

ANT

BTS

VSWR Monitor

TX

TX

RX1

RX1

RX2

RX2

TX/RX

TX/RX

ANTENNA

ANT

BTS

TX/RX

TX/RX

Figure 1-4 Two antenna (Tx/Rx + Tx/Rx) configuration

Unused Rx ports on the VM do not require terminations.

NOTE

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Summary of Contents for VSWR

Page 1: ...CHAPTER 2 CHAPTER 3 CHAPTER 4 CHAPTER 5 CHAPTER 1 ...

Page 2: ......

Page 3: ...Cellular Infrastructure Group SERVICE MANUAL SUPPLEMENT VSWR MONITOR FOR M CELL6 68P02900W86 O ...

Page 4: ......

Page 5: ...5th Feb 99 Service Manual Supplement VSWR Monitor for M Cell6 68P02900W86 O i Service Manual Supplement VSWR Monitor for M Cell6 E Motorola 1999 All Rights Reserved Printed in the U K ...

Page 6: ...onable efforts have been made to assure the accuracy of this document Motorola assumes no liability resulting from any inaccuracies or omissions in this document or from the use of the information obtained herein Motorola reserves the right to make changes to any products described herein to improve reliability function or design and reserves the right to revise this document and to make changes f...

Page 7: ...gurations 1 3 Multiple VM configurations 1 4 VM alarm connections 1 5 Introduction 1 5 Individually wired VM alarms 1 5 Serial linked VM alarm 1 5 Chapter 2 Installation i Preparing to install the VM 2 1 Introduction to VM installation 2 1 Part numbers 2 1 Choosing a location 2 1 Tools and equipment required 2 1 Installing the VM 2 2 Safety precautions 2 2 Cable loss compensation jumper settings 2...

Page 8: ...5th Feb 99 iv Service Manual Supplement VSWR Monitor for M Cell6 68P02900W86 O ...

Page 9: ...e victim clear of the conductor WARNING Artificial respiration In the event of an electric shock it may be necessary to carry out artificial respiration Send for medical assistance immediately Burns treatment If the patient is also suffering from burns then without hindrance to artificial respiration carry out the following 1 Do not attempt to remove clothing adhering to the burn 2 If help is avai...

Page 10: ...re familiar with this procedure Procedure Whenever a safety issue arises 1 Make the equipment concerned safe for example by removing power 2 Make no further attempt to tamper with the equipment 3 Report the problem directly to GSM Customer Network Resolution Centre 44 0 1793 430040 telephone and follow up with a written report by fax 44 0 1793 430987 fax 4 Collect evidence from the equipment under...

Page 11: ...enance for example the use of adhesives and solvents as well as those inherent in the equipment Example and format Do not look directly into fibre optic cables or optical data in out connectors Laser radiation can come from either the data in out connectors or unterminated fibre optic cables connected to data in out connectors WARNING Cautions Definition A caution means that there is a possibility...

Page 12: ...or 415 V ac three phase mains which is potentially lethal Therefore the areas where the ac mains power is present must not be approached until the warnings and cautions in the text and on the equipment have been complied with To achieve isolation of the equipment from the ac supply the mains input isolator must be set to off and locked Within the United Kingdom UK regard must be paid to the requir...

Page 13: ...ipment Because of the danger of introducing additional hazards do not install substitute parts or perform any unauthorized modification of equipment Contact Motorola if in doubt to ensure that safety features are maintained Battery supplies Do not wear earth straps when working with standby battery supplies Toxic material Certain Motorola equipment incorporates components containing the highly tox...

Page 14: ...sure ceilings Controlled environment Controlled environments are locations where there is exposure that may be incurred by persons who are aware of the potential for exposure as a concomitant of employment by other cognizant persons or as the incidental result of transient passage through areas where analysis shows the exposure levels may be above those shown for uncontrolled environments but do n...

Page 15: ...0MHz 1970MHz Ceiling 1 287mW cm2 1 313mW cm2 6 433mW cm2 6 567mW cm2 If you plan to operate the equipment at more than one frequency compliance should be assured at the frequency which produces the lowest exposure ceiling among the frequencies at which operation will occur Licensees must be able to certify to the FCC that their facilities meet the above ceilings Some lower power PCS devices 100 mi...

Page 16: ...lanning and design validation that the operating facility using this equipment actually complies will require making power density measurements For information on measuring RF fields for determining compliance with ANSI IEEE C95 1 1991 see IEEE Recommended Practice for the Measure of Potentially Hazardous Electromagnetic Fields RF and Microwave IEEE Std C95 3 1991 Copies of IEEE C95 1 1991 and IEE...

Page 17: ...ty with swallowing and breathing Severe poisoning causes chest pain and wheezing which may progress to severe shortness of breath due to congestion of the lungs Incubation period for lung symptoms is 2 20 days Exposure to moderately high concentrations of Beryllium in air may produce a very serious condition of the lungs The injured person may become blue feverish with rapid breathing and raised p...

Page 18: ...la or similar tool The spatula tool used to collect the paste is also to be placed in the container The container is then to be sealed and labelled A suitable respirator is to be worn at all times during this operation Components which are successfully removed are to be placed in a separate bag sealed and labelled Disposal methods Beryllium Oxide or components containing Beryllium Oxide are to be ...

Page 19: ...n labels must not be removed painted over or obscured in any way Specific cautions Cautions particularly applicable to the equipment are positioned within the text of this manual These must be observed by all personnel at all times when working with the equipment as must any other cautions given in text on the illustrations and on the equipment Fibre optics The bending radius of all fibre optic ca...

Page 20: ...n handling the replacement S Always wear an earth strap which must be connected to the electrostatic point ESP on the equipment S Leave the short circuit on the leads until the last moment It may be necessary to replace the conductive foam by a piece of wire to enable the device to be fitted S Do not wear outer clothing made of nylon or similar man made material A cotton overall is preferable S If...

Page 21: ...5th Feb 99 Service Manual Supplement VSWR Monitor for M Cell6 68P02900W86 O i Chapter 1 Overview ...

Page 22: ...5th Feb 99 ii Service Manual Supplement VSWR Monitor for M Cell6 68P02900W86 O ...

Page 23: ...n of the VSWR monitor 1 1 Introduction to the VSWR monitor 1 1 Purpose of the VSWR monitor 1 1 VSWR monitoring range 1 2 RF configurations 1 3 Introduction 1 3 Single VM configurations 1 3 Multiple VM configurations 1 4 VM alarm connections 1 5 Introduction 1 5 Individually wired VM alarms 1 5 Serial linked VM alarm 1 5 ...

Page 24: ...5th Feb 99 iv Service Manual Supplement VSWR Monitor for M Cell6 68P02900W86 O ...

Page 25: ...tional VMs will be required The VM is designed to be installed in the Tx Rx lines between the BTS and the antenna It monitors the RF signals by means of side mounted dual directional couplers An integral mounting bracket is fitted to the base of the VM The VM requires an external 48 V dc power supply which must be provided by the user Alarm outputs are provided to connect the VM to an external PIX...

Page 26: ...e insertion loss of the antenna cable the distance between the VM and the antenna can be expressed as follows 1 5 1 VSWR 1 1 with antenna cable loss 0 2 dB 2 1 VSWR 1 1 with antenna cable loss 2 3 5 dB 3 1 VSWR 1 1 with antenna cable loss 3 5 5 dB Jumpers are provided on the side of the VM to enable the user to select the most appropriate setting to compensate for cable loss see Installing the VM ...

Page 27: ...sector has no more than three antennas and there is only one Tx antenna Figure 1 2 and Figure 1 3 illustrate typical RF configurations for a single VM VSWRMonitor TX TX RX1 RX1 RX2 RX2 BTS sector TX RX RX TX RX RX ANTENNA ANTENNA ANTENNA ANT BTS TX RX RX Figure 1 2 Simple three antenna Tx 2 x Rx configuration VSWRMonitor TX TX RX1 RX1 RX2 RX2 BTS sector TX RX RX TX RX RX ANTENNA ANTENNA ANT BTS TX...

Page 28: ...both transmitting and receiving then one VM will be required for each Tx Rx antenna as shown in Figure 1 4 VSWRMonitor TX TX RX1 RX1 RX2 RX2 BTS sector TX RX TX RX ANTENNA ANT BTS VSWRMonitor TX TX RX1 RX1 RX2 RX2 TX RX TX RX ANTENNA ANT BTS TX RX TX RX Figure 1 4 Two antenna Tx Rx Tx Rx configuration Unused Rx ports on the VM do not require terminations NOTE ...

Page 29: ...r to the appropriate section of the M Cell6 Service Manual for information on wiring alarm sensors to the PIX connector on the BTS Individually wired VM alarms Each VM unit can be individually wired to a separate external BTS PIX alarm as shown in Figure 1 5 VM 2 ALARM 1 VM 1 VM 3 ALARM 2 ALARM 3 Figure 1 5 Separate VM alarms Serial linked VM alarm The alarm outputs from all VMs can be wired toget...

Page 30: ...VM alarm connections 5th Feb 99 1 6 Service Manual Supplement VSWR Monitor for M Cell6 68P02900W86 O ...

Page 31: ...5th Feb 99 Service Manual Supplement VSWR Monitor for M Cell6 68P02900W86 O i Chapter 2 Installation ...

Page 32: ...5th Feb 99 ii Service Manual Supplement VSWR Monitor for M Cell6 68P02900W86 O ...

Page 33: ...oduction to VM installation 2 1 Part numbers 2 1 Choosing a location 2 1 Tools and equipment required 2 1 Installing the VM 2 2 Safety precautions 2 2 Cable loss compensation jumper settings 2 2 Mounting the VM 2 3 Connecting the RF cables 2 3 VM Alarm connections 2 3 VM Power connections 2 3 Testing the VM 2 4 General 2 4 Test procedure 2 4 ...

Page 34: ...5th Feb 99 iv Service Manual Supplement VSWR Monitor for M Cell6 68P02900W86 O ...

Page 35: ...th for the coaxial cables they should be kept as short as possible NOTE Choosing a location Choose a suitable location for mounting the VM paying particular attention to the following S The orientation of the VM so that the RF cable runs will be reduced to a minimum S Easy access to the six coaxial connectors on the VM will be required S The length of the coaxial cable set if a set of pre assemble...

Page 36: ...s Cable loss compensation jumper settings Figure 2 1 shows the arrangement of the three cable loss compensation jumper blocks on the side of the VM TX Off RX2 RX1 2 3 5 5 Off 2 3 5 5 Off 2 3 5 5 JUMPER JUMPER BLOCK ALARM LEDs Figure 2 1 Arrangement of cable loss compensation jumper blocks on the VM Set the position of the jumpers for each of the Rx and Tx connections according to the information s...

Page 37: ...e appropriate Tx or Rx connectors on the BTS 3 Connect the coaxial cables that were previously disconnected from the BTS to the appropriate connectors on the antenna side of the VM VM Alarm connections Plug the connector on the alarm cable into its socket on the VM the connector will only fit the socket in one position If multiple VMs are to be connected wire the alarm cables in accordance with th...

Page 38: ... connection points for the site and check that the corresponding alarm LED on the VM is illuminated Check that the DMM reads an open circuit of more than 100 kΩ on each Rx alarm circuit which is displaying an illuminated alarm LED 5 Reconnect the Rx cables Check that the Rx alarm LEDs on the VM are not lit and the DMM reads a short circuit of less than 1 Ω 6 Disable transmitter RF power to the VM ...

Page 39: ...5th Feb 99 Service Manual Supplement VSWR Monitor for M Cell6 68P02900W86 O i Chapter 3 Maintenance ...

Page 40: ...5th Feb 99 ii Service Manual Supplement VSWR Monitor for M Cell6 68P02900W86 O ...

Page 41: ...WR Monitor for M Cell6 68P02900W86 O iii Chapter 3 Maintenance i Troubleshooting the VM 3 1 Introduction to VM maintenance 3 1 Symptoms of a defective VM 3 1 Maintenance procedures 3 2 Maintenance philosophy 3 2 Replacing a defective VM 3 2 ...

Page 42: ...5th Feb 99 iv Service Manual Supplement VSWR Monitor for M Cell6 68P02900W86 O ...

Page 43: ...cted and known to be working False alarms For a true false alarm to occur thus indicating a failure within the VM all of the following conditions must be met 1 A Tx Rx alarm signal from the VM has been received by the BTS 2 The BTS is transmitting and receiving normally 3 The jumper settings for unused VM connections have been set to OFF if applicable 4 One or more of the alarm LEDs on the VM is i...

Page 44: ... be fitted with the VM by using lock device commands from the OMC or via a PC connected to the MCU Check that the orange Tx STATUS LEDs on the relevant TCUs are not lit before starting to disconnect the RF cables Removal procedure The procedure for removing a VM is as follows 1 Disconnect the 48 V dc supply from the VM 2 Disconnect the alarm cable from the VM 3 Label all RF cable connections to th...

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