Antenna/Cable System Sweep MOP

Antenna/Cable System Sweep MOP
Antenna/Cable System Sweep MOP
ND-00029
Rev. 5.2 6/21/2010
Overview
This document describes the method of procedures for antenna system sweep testing and acceptance
requirements for all AT&T Mobility antenna and coax systems. It focuses on the use of standard setup
and calibration techniques to establish the necessary criteria that determine the validity of the antenna
systems being tested. Recording and saving the data is important for future sweep tests.
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Antenna/Cable System Sweep MOP
Contents
1.
About This Document....................................................................................................................... 6
1.1 Purpose ....................................................................................................................................... 6
1.2 Scope .......................................................................................................................................... 6
1.3 Audience ..................................................................................................................................... 6
1.4 Related Documentation............................................................................................................... 6
1.5 Acronyms and Terms .................................................................................................................. 7
1.6 Trademarks ................................................................................................................................. 8
1.7 Contacts ...................................................................................................................................... 8
2.
Sweep Objectives and Process ....................................................................................................... 9
3.
Preparation ......................................................................................................................................... 11
3.1 Tools and Equipment................................................................................................................. 11
3.2 Calibration ................................................................................................................................. 11
3.3 Certification ............................................................................................................................... 12
3.4 Testing....................................................................................................................................... 12
4.
Sweep Test Scenarios.................................................................................................................... 13
4.1 Return Loss of Antenna (Verify Antenna Quality) ..................................................................... 13
4.2 Return Loss – 50 ohm LOAD (Verify Cable System Quality) .................................................... 15
4.3 DTF – 50 ohm LOAD (Check Cable System Components Continuity) .................................... 17
4.4 Return Loss – SHORT (Measure Cable System Insertion Loss).............................................. 18
4.5 DTF – SHORT (Measure System Cable Length) ...................................................................... 19
4.6 Complete System Return Loss Sweep ..................................................................................... 20
4.7 Complete System DTF Sweep .................................................................................................. 22
4.8 Miscellaneous RF Equipment Verification ................................................................................ 23
5.
Reporting and Deliverables ............................................................................................................ 24
Appendix A – Anritsu Site Master® Setup Procedures .......................................................................... 25
A.1 Return Loss Mode – “A”, “B”, or “C” SiteMaster Model ............................................................. 25
A.2 Distance-to-Fault (DTF) Setup [2] ............................................................................................. 29
A.3 Anritsu Sweep Software ............................................................................................................ 29
Appendix B – Tektronix NetTek® Setup and Calibration Procedure ..................................................... 30
B.1 Return Loss Measurement Setup ............................................................................................. 30
B.2 Distance to Fault (DTF) Measurement Setup ........................................................................... 33
B.3 Cable Loss Measurement Setup ............................................................................................... 35
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B.4 Tektronix Sweep Software ........................................................................................................ 36
Appendix C – Agilent FieldFox Setup Procedures ................................................................................ 37
C1. Measure Return Loss ........................................................................................................... 37
C2. Measure Distance to Fault ................................................................................................... 38
C3. Measure Cable Loss (1-Port) ............................................................................................... 39
C4. Calibration............................................................................................................................. 40
C5. Save and Recall Files ........................................................................................................... 40
Appendix D – Rohde & Schwarz FSH DTF Measurement .................................................................... 42
Appendix E - Typical Cable Loss Reference.......................................................................................... 45
E.1 Andrew ...................................................................................................................................... 45
E.2 Commscope .............................................................................................................................. 45
E.3 Eupen ........................................................................................................................................ 46
E.4 RFS ........................................................................................................................................... 46
Appendix F – Exemplary Sweep Screenshots................................................................................................. 47
F.1 Return Loss Sweep ................................................................................................................... 47
F.1.1 Return Loss with 50-ohm load .......................................................................................... 47
F.1.2 Return Loss with short ...................................................................................................... 47
F.1.3 Return Loss – complete system ....................................................................................... 48
F.2 Distance-to-Fault Sweep ........................................................................................................... 48
F.2.1 Distance-to-Fault with 50-ohm load .................................................................................. 48
F.2.2 Distance-to-Fault with short .............................................................................................. 49
F.2.3 Distance-to-Fault – complete system ............................................................................... 49
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Document Revision History
Date
Rev
Revision Description
Writer
Sponsor
3/26/2004
3.1
ECR 4178, Updated Test Scenarios for AOA –
see section 3.5. Removed LMU references as
applicable.
PB Architects
Greg Long
5/10/2005
3.2
Converted to Cingular template
Gregory Long
Ali Jabbary
11/27/2007
4.0
Converted to ATT template
Ming Ho
Ayman Mostafa
Ming Ho
Adnan Naqvi
Ming Ho
Kaushik Gohel
Ming Ho
Kaushik Gohel
Updated diagrams, tables, TMA process
11/3/2008
5.0
Updated antenna sweep return loss criterion.
Updated DTF – Load criteria based on the
presence of surge arrestor or not.
Corrected typos and reorganized document.
Incorporated comments based on 10/28/08
review call.
10/2/2009
5.1
Added Agilent Fox tester MOP in Appendix C.
Added Rohde & Schwarz FSH MOP in Appendix
D.
6/21/2010
5.2
Updated sweep frequencies for 700 MHz and
AWS bands
RACI
This table identifies RACI team members.
Accountable
Responsible
Consulted
Informed
Kaushik Gohel
Ming Ho
Jay Young
Muhammad Gill
Mike Johnson
Wynn Batson
Nico Vlok
Effendi Jubilee
Randy Thomas
Jim Compton
Francis Malabanan
Richard Elder
Michael Tolbert
Somesh Dua
Anne Le
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Antenna/Cable System Sweep MOP
Mike Riebe
Chris Lee
Travis Duke
Otis Collier
Wiley Burns
Dinko Sefic
Anritsu
Tektronix
Agilent
Rohde & Schwarz
RF HW Task Force
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1. About This Document
Today’s digital wireless communication systems require much more rigorous component and
system specification than previous analog systems did. Consequently, there is a need for high
performance testing.
Antenna system sweeps are an invaluable tool that is used to identify cable, connector, surge
suppressor, TMA and antenna problems, or degradations to the complete antenna system. A
complete antenna system includes the components of the base station site that lie between the
base station equipment up to and including the antenna.
At newly installed sites, system sweeps are used to measure the quality of the installation and
identify or resolve any issues before a site is allowed to carry public traffic.
At existing sites, antenna sweeps are important from a preventive maintenance perspective.
Scheduled site antenna system sweeps can help to identify any adverse changes in the
antenna system before customers are impacted.
1.1
Purpose
The purpose of this document is to ensure that all installation technicians use the same method
and standards to sweep AT&T Mobility antenna systems.
1.2
Scope
This document provides the method to sweep AT&T Mobility antenna systems.
1.3
Audience
This document is intended for AT&T Mobility RF engineering, implementation engineering and
operation engineering personnel and folks authorized by AT&T Mobility including civil vendor and
contractor.
1.4
Related Documentation
The following documents are related to this document:
ND-00154
RF Coaxial Cable Guidelines
ND-00170
TMA Guidelines
ND-00166
Triplexer Guidelines
NG-0028
MCPA/SCPA Guidelines
NG-0029
RF Surge Arrestor Guidelines
ND-00026
RF Connector & Weatherproofing Guidelines
ND-00114
Antenna Guidelines
ND-00135
RET Guidelines
ND-00194
RX-AIT Guidelines
ND-00354
PIM Measurement MOP
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Reference:
[1] Testing Antenna System with Tower Mounted Amplifier, Tektronix Application Note.
[2] Site Master Distance-to-Fault, Anritsu Application Note.
[3] Tower Mounted Amplifiers, Diagnostics and Isolation Measurements, Anritsu Application Note.
[4] Basics of Using YBA250, Tektronix Application Note.
For AT&T Mobility network guidelines and documents, visit the mobility network services web site
at:
Network Guidelines: http://ns.cingular.net/netguide.aspx
Network Documents: http://ns.cingular.net/networkdoc.aspx
For AT&T Mobility approved RF hardware products, visit the mobility network services web site
at:
RF Equipment Engineering: http://ns.cingular.net/sites/RFEng/tools_d.aspx
1.5
Acronyms and Terms
The following acronyms and terms are used in this document:
ND-00029
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DIN
Deutsches Institut für Normung
DTF
Distance to Fault
MHA
Masthead Amplifier
PIM
Passive InterModulation
TMA
Tower-Mounted Amplifier
TVSS
Transient Voltage Surge Suppressor
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1.6
Trademarks
The trademarks used in this document are the property of their respective owners.
1.7
Contacts
For questions or comments about this document's technical content or to request changes
to the document, contact:
Ming Ho, 404-499-5582, MH8532@ATT.COM
Mike Johnson, 330-509-6581, MJ517t@ATT.COM
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2.
Sweep Objectives and Process
A complete system sweep testing consists of several tests such as Return Loss and Distance to
Fault (DTF). Return loss is a frequency domain sweep and is a measurement of the match
between RF components. DTF is a time domain sweep (vs. distance) and is a measurement for
pinpointing the location and reflection amplitude of a transmission line and associated component
and connection. It is primarily used for troubleshooting after return loss sweep fails. Table 1 lists
the objectives and criteria for each sweep test. Detailed discussions of individual test are
addressed in Section 4.
Table 1 – Different Sweep Tests and Objectives
Objective
Measurement
Section
Limit
Verify Antenna Quality
Return Loss of Antenna
4.1
Vendor Datasheet or
Market Requirement
Verify Cable System Quality
Return Loss – 50 ohm LOAD
4.2
-20 dB
Check Cable System
Components Continuity
DTF – 50 ohm LOAD
4.3
-25 dB (w TVSS)
Measure Cable System
Insertion Loss
Return Loss - SHORT
4.4
Measure Cable System
Length
DTF – SHORT
4.5
Verify Complete Antenna
System Quality
Return Loss of Complete
System
4.6
Verify Complete Antenna
System Quality
DTF of Complete System
4.7
-31 dB (w/o TVSS)
Appendix E
-15.5 dB
Figure 1 illustrates a high level flow chart that describes the typical work process to qualify and
quantify a complete antenna system.
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Figure 1 – Antenna System Sweep Process Flowchart
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3.
Preparation
3.1
Tools and Equipment
There are several manufacturers for site testing tools including spectrum analyzers and network
analyzers. Use and operation of sweep test equipment shall be in accordance with manufacturer’s
instructions. AT&T Mobility will not disqualify any manufacturer, nor sweep testing results, that are
completed using equipment other than what is outlined in this standard document. Currently, this
document recommends the use of the following test instruments:
Tektronix
•
NetTek Analyzer using the YBA250 Antenna Tester Suite with either the Y400 or
Y350 hardware platforms.
Anritsu
•
S331/332 A/B/C, S235/251 A/B/C, S400A Site Master
•
MT8222A/B BTS Master
Agilent Technologies
FieldFox RF Analyzer, N9912A
Rohde & Schwarz
FSH8
Other equipment required to complete the sweep tests:
3.2
•
Precision 7-16 DIN (or N) 50 ohm Open/Short/Load
•
7-16 DIN (or N) adapters including male-to-female or female-to-female
•
Two-way radio for communication between the testing technicians located at the
top of the antenna support structure and at the testing point
•
10-foot (3.05 meter) long, ½-inch diameter coax jumper with one 7-16 DIN male
connector located at each end of the jumper. (This is only required if the bottom
jumper is not already installed into the antenna feed line system.)
•
Connector torque wrench, such as Andrew Part# 244377 or equivalent.
Calibration
Test equipment shall be allowed to stabilize in the test environment prior to calibration for a
minimum of thirty minutes, and shall be recalibrated at a minimum of every two hours and after
any change in environment, to ensure accuracy.
Ensure all calibration equipment is clean and void of any debris or any obvious signs of
mechanical damage or defects.
If different jumper cables or connectors are used, then the instrument should be
recalibrated.
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It is required that all sweep & load equipment be certified and verified by an authorized
calibration facility on an annual basis. If requested, proof of calibration shall be submitted
to AT&T Mobility or AT&T Mobility’ designated representative.
The factory calibration can be used at any time when highly accurate measurements are
not required. A jumper cable cannot be used with the factory calibration. If a jumper
cable is required or the user wants the best accuracy, then the user should proceed with
the “User Calibration.”
3.3
Certification
It is required that all technicians and contractors operating sweep test equipment shall obtain or
attend a certified user’s training class before operating the equipment. Contact your local test
equipment Account Manager to arrange this.
3.4
Testing
Sweep test must be performed for each line. Preferably, the sector being tested
should be shut off, to prevent spurious transmissions from polluting the test results. No
sweeps will be passed that show interference from nearby antennas. All tests for a given
line must be from the same date.
Every effort should be used to limit the use of adapters; however, if it is unavoidable,
adapters should be high quality, and where possible, included in the calibration so that
when calibration is completed, the calibration point will connect directly to the device
under test.
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4.
Sweep Test Scenarios
4.1 Return Loss of Antenna (Verify Antenna Quality)
This step is required for all antennas including new and reused antennas. Testing all antennas
before mounting onto the antenna support structure eliminates any possibility of rework and cost
that may occur due to a faulty antenna. Testing should include all ports of the antenna and should
cover all operating frequency bands.
1. The antenna should be tested in an outdoor area where there are no obstructions to
avoid reflections. For directional panel antennas, the antenna shall be elevated at least 3feet above the ground, away from any metallic objects and in a face-up position pointed
at the open sky. Omni antenna should be placed in a vertical orientation clear of any
obstacles.
2. Configure the sweep test instrument for RETURN LOSS by either recalling the saved
Return Loss setup for the frequency band of interest or performed the step by step
process outlined in the Appendix for NetTek and SiteMaster.
3. Set Mask (Limit Line) to correct value based on market’s own requirement or antenna
datasheet. It is noted that different frequency band may have different return loss spec.
-
Cellular Band: 824 MHz – 894 MHz
-
PCS Band: 1850 MHz – 1990 MHz
-
700 MHz Band: 698 – 894 MHz
-
AWS Band (uplink): 1710 – 1755 MHz
-
AWS Band (downlink): 2110 – 2155 MHz
-
Due to wideband antenna, the VSWR spec listed in the datasheet is very relaxed. It
could be as low as 1.5 VSWR (-14 dB Return Loss). Typical antenna should perform
much better than the spec value. Markets should use their own experience or
requirement. For example, if a specific type of antenna usually perform better than 18 dB, then the antenna with -15 dB return loss should be scrutinized even if it is still
better than the datasheet. Similarly, if you verify a group of antennas, the outliners of
less performing antennas should be noted.
-
It is noted that sweep testing, itself, cannot tell the whole story of antenna quality.
Other key antenna factors like PIM, gain, beamwidth and directivity cannot be verified
from the sweep test.
4. Verify user calibration is valid and is displayed on the top of the display.
5. Locate the peaks across the entire test frequency and verify that the sweep in these
bands is below the return loss value limit line.
6. Every port of the antenna should be verified.
7. Verify all antennas are acceptable prior to installation.
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The following table lists Return Loss vs. VSWR for typical antenna measurement.
VSWR
1.05
1.10
1.15
1.20
1.25
1.30
1.35
1.40
1.45
1.50
1.55
1.60
1.65
1.70
1.75
1.80
1.85
1.90
1.95
2.00
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Return
Loss (dB)
-32.26
-26.44
-23.13
-20.83
-19.08
-17.69
-16.54
-15.56
-14.72
-13.98
-13.32
-12.74
-12.21
-11.73
-11.29
-10.88
-10.51
-10.16
-9.84
-9.54
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4.2 Return Loss – 50 ohm LOAD (Verify Cable System Quality)
The cable system is defined as the Equipment Jumper, TVSS (surge arrestor) device, Main Feed
Line, Feed Line Jumper, MHA Bypass Adapter (if applicable), and Top Jumper. TMA (MHA) is not
included. Figure 2 shows the diagram for verifying cable system quality. Any opens, shorts, or
kinks will appear as high return loss.
TMA/MHA must be operated at bypass mode. If bypass mode is not available, a Bypass
Adapter such as a 7-16 DIN female-to-female adapter should be used. Otherwise, only
the transmit frequency band should be observed.
If the equipment jumper is not already installed, configure a 10-foot (3.05 meter) jumper
and connect it to the input of the TVSS unit.
An ohmmeter can be used to verify the lines are correct.
Figure 2 – Verify Cable System Quality.
1. Configure the sweep test instrument for RETURN LOSS by either recalling the saved
Return Loss setup for the frequency band of interest or performed the step by step
process outlined in the Appendix for NetTek and SiteMaster.
2. Verify user calibration is valid and is displayed on the top of the display.
3.
Perform RETURN LOSS with a 50 ohm LOAD.
4. Set the Limit to –20 dB across the entire display range.
5. Place the 50 ohm LOAD (same one used for calibration) at the end of the ANTENNA
TOP JUMPER and measure RETURN LOSS.
6. If the value is above the –20 dB limit line anywhere across the sweep range, use the
DISTANCE-TO-FAULT, Section 4.3, as a troubleshooting aid to identify the questionable
component and repair or replace as necessary. Repeat RETURN LOSS and verify the
reading is below the –20 dB limit line across the entire sweep range.
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7. Place the marker on peak.
8. SAVE THE DISPLAY to memory and record PEAK value on the submission form.
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4.3 DTF – 50 ohm LOAD (Check Cable System Components Continuity)
The distance to fault test results shall be used to determine the component within the system
where the fault exists.
1. Configure the sweep instrument for DTF - RETURN LOSS by either recalling the saved
DTF setup for the frequency band of interest or performed the step by step process
outlined in the Appendix for NetTek and SiteMaster.
2. Verify user calibration is valid and is displayed on the top of the display.
3. On the main DTF screen, verify:
a.
Cable type is correct (predominant cable type installed).
b.
End Distance is at least 20% longer than the maximum line length to test.
c.
Method/RESOLUTION is set to Normal (1024 points).
1
4. Set the Limit to –25 dB or higher across the entire display range . For new site build,
some markets may have more stringent requirement.
5. If the value is above –25 dB limit line anywhere across the sweep range, identify the
questionable component and repair or replace as necessary. A visual inspection of
connector fit and for installation damage is likely to reveal the problem. Analyze the DTFLoad to determine the physical location of the failing element. Then consult with AT&T
project management who will consult the scope of the project to determine the
appropriate remediation. The following criteria can be used as a guideline to determine
the site requirements:
•
If bottom-side jumper, connector or TVSS are the source of the fault, they shall be
replaced.
•
If top-side jumper, connector, or antenna is the source of the fault, and the presweep test was no worse than the pass/fail limit, proceed with the work and notify
AT&T Mobility or AT&T Mobility’ authorized representative that the antenna system
does not meet the requirements. Tower top work may be required to correct the
fault at the direction of AT&T Mobility.
•
If main coaxial cable is the source of the fault, notify AT&T Mobility or AT&T
Mobility’ authorized representative of the fault. The main coaxial cable may be
replaced, with AT&T Mobility approval.
6. Save the display to memory and record the value on the submission form.
1
If no surge arrestor (TVSS) device or Bias-T is included in the test path, the limit should at -31 dB or
higher.
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4.4 Return Loss – SHORT (Measure Cable System Insertion Loss)
Figure 3 – Measure Cable System Insertion Loss.
1. Configure the sweep instrument for CABLE LOSS/RETURN LOSS by either recalling the
saved Return Loss setup for the frequency band of interest or performed the step by step
process outlined in the Appendix for NetTek and SiteMaster.
2. Verify user calibration is valid and is displayed on the top of the display.
3. Place the SHORT (same one used for calibration) at the end of the ANTENNA TOP
JUMPER and measure CABLE LOSS/RETURN LOSS.
4. Select AUTO SCALE to optimize display.
5. Using the Marker function, place M1 to PEAK and M2 to VALLEY.
6. Determine cable loss by adding M1and M2 markers and dividing by four:
(M1+M2)/4 = one-way cable insertion loss
7. Record value in SITE SUBMISSION FORM. Typical cable attenuation values can be
found in Appendix C.
8. Save the display to memory and record the value on the submission form.
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4.5 DTF – SHORT (Measure System Cable Length)
1. Configure the sweep instrument for DTF RETURN LOSS by either recalling the saved
DTF setup for the frequency band of interest or performed the step by step process
outlined in the Appendix for NetTek and SiteMaster.
2. Verify user calibration is valid and is displayed on the top of the display.
3. On the main DTF screen, verify:
a.
Cable type is correct (predominant cable type installed).
b.
End Distance is at least 20% longer than the maximum line length to test.
c.
Method/RESOLUTION is set to Normal (1024 points).
4. Measure & record cable lengths by placing M1 marker to peak and recording cable length
into the Antenna System Site Submission Form. Should be at or near zero dB and is
the length for the entire cable line as measured.
5. Save the display to memory and record the value on the submission form.
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4.6 Complete System Return Loss Sweep
The Complete Antenna System is defined to include the following equipment: Equipment jumper,
Duplexer, Diplexer, Diplexer Jumpers, Bottom Jumper, TVSS device, Main Feed Line, Feed Line
Jumper, TMA/MHA (if applicable), Top Jumper, and Antenna. It is a measure of the complete
transmission system quality.
Antenna
Equipment
Connection Point
Main Feed Line
Equipment Jumper
Top Jumper
Test Cable
Feed Line Jumper
MHA/MAU
(If Applicable)
Figure 2 - Verify Complete Antenna System – Return Loss
1. Connect the Antenna to the Top jumper.
2. Set LIMIT LINE to –15.5 dB across entire display.
3. Verify user calibration is valid and is displayed on the top of the display.
4. Using the Marker function,
700 MHz
Cellular
PCS
AWS
M1
698 MHz
824 MHz
1850 MHz
1710 MHz
M2
716 MHz
849 MHz
1910 MHz
1755 MHz
M3
728 MHz
869 MHz
1930 MHz
2110 MHz
M4
746 MHz
894 MHz
1990 MHz
2155 MHz
5. With only a Duplexer in-line, verify between Transmit markers (M3 and M4) and
Receive markers (M1 and M2) that the displays are below the –15.5 dB LIMIT LINE.
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2
6. With a TMA in line, set TMA at bypass mode . Verify between Transmit markers (M3
and M4) and Receive markers (M1 and M2) that the displays are below the –15.5 dB
LIMIT LINE.
7. If the TMA bypass mode is not available. Only verify between Transmit markers (M3 and
M4) that the display is below the –15.5 dB LIMIT LINE.
8. Neither a TMA or a Duplexer is in line, verify between markers across the entire band
(Transmit and Receive combined) that the display is below the –15.5 dB LIMIT LINE.
9. Save the display to memory and print out the copies.
2
All AT&T approved TMA include bypass functionality when DC power is lost.
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4.7 Complete System DTF Sweep
This test is used to identify any problems that may cause high loss in the system return loss test.
There is no acceptance criterion for this test. This test provides a baseline for the loss associated
with connectors and components in the transmission line. In the future, if the site performance
has degraded, comparison of DTF-System plots can identify the problem.
1. Configure the sweep instrument for DTF RETURN LOSS by either recalling the saved
DTF setup for the frequency band of interest or performed the step by step process
outlined in the Appendix for NetTek and SiteMaster.
2. Verify user calibration is valid and is displayed on the top of the display.
3. On the main DTF screen, verify:
a.
Cable type is correct (predominant cable type installed).
b.
End Distance is at least 20% longer than the maximum line length to test.
c.
Method/RESOLUTION is set to Normal (1024 points).
4. Display DISTANCE-TO-FAULT for the entire antenna feedline system. This sweep will
be used in the future as a baseline to track any changes in the cable system and to
increase the ability to identify potential problems early and correctly.
5. Save the display to memory and print out the copies.
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4.8 Miscellaneous RF Equipment Verification
The TMA/MHA should be verified at Depot or warehouse level prior to distribution to the
field. For TMA testing, please refer to [1] and [3].
Using the same tests outlined in Section 4.2, verify all miscellaneous RF equipment
(jumpers, diplexers, duplexers, filters, etc.), at minimum, meet the manufacturer’s
specifications. These tests need to be performed prior to installation into the antenna
feedline system.
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5.
Reporting and Deliverables
A completed sweep package shall be delivered to the AT&T Mobility Construction Manager or
3
AT&T Mobility’ designated representative for archiving , within 5 working days of completion of
the tests. The package shall contain the graphs and data sheet of each antenna path in three (3)
hard copies (printouts) and one (1) soft copy (electronic copy).
Return Loss – Antenna, Section 4.1 (for new antenna installation)
Return Loss – 50 ohm LOAD, Section 4.2
Return Loss – SHORT (insertion loss), Section 4.4
Distance-to-Fault – SHORT (cable length), Section 4.5
Return Loss – Complete Antenna System, Section 4.6
Distance-to-Fault – Complete Antenna System, Section 4.7
All screenshots and sweep log files should be stamped with measurement date and time.
3
All site sweep data should be archiving and constantly updated.
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Appendix A – Anritsu Site Master® Setup Procedures
A.1
Return Loss Mode – “A”, “B”, or “C” SiteMaster Model
1.
Connect test port extension cable to reflection port and ensure connection is tight.
2.
Press ON/OFF to turn on SiteMaster.
3.
Press ENTER.
4.
Press MODE.
5.
Select FREQ – RETURN LOSS.
6.
Select F1 soft key and type Uplink and Downlink Frequency Ranges for
appropriate bands that are listed in Tables A1-A3.
7.
}.
8.
Press ENTER.
9.
Select F2 soft key and type Uplink and Downlink Frequency Ranges for
appropriate bands that are listed in Tables A1-A3.
10.
}.
11.
Press ENTER.
12.
Press MARKERS.
13.
Select M1 soft key.
14.
Select EDIT soft key and set M1 to value as noted in the appropriate table.
15.
Select BACK soft key. {Model “B” only.)
16.
Perform the same process setting M2, M3, and M4 as noted in the appropriate
table.
17.
Press LIMIT {Model “A” or “B”}, Press AMPLITUDE {Model “C”}
18.
Select TOP soft key and type 0.
19.
Press ENTER.
20.
Select BOTTOM soft key and type 40.
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21.
Press ENTER.
22.
Select LIMIT soft key {Model “A” or “B”}, Press LIMIT {Model “C”}.
23.
Set Single LIMIT to -20.
24.
Press SWEEP {Model “B” and “C” only}.
25.
Select RESOLUTION soft key.
26.
Select 130 soft key.
27.
Verify SINGLE SWEEP is OFF by selecting/deselecting SINGLE SWEEP soft key.
28.
Press START CAL and follow the instructions at the bottom of the display:
29.
Connect OPEN calibration component to test port.
30.
Press ENTER.
31.
Connect SHORT calibration component to test port.
32.
Press ENTER.
33.
Connect LOAD calibration component to test port.
34.
Press ENTER.
35.
Press SAVE SETUP.
36.
Press UP/DOWN cursor control to select memory location.
37.
Press ENTER.
4
4
Various Site Master products have different capabilities, e.g., the 251B has multiple segments compared to
the 331B (and higher), which is single limit. When using the 251B, set limit to FULL SPAN and EDIT
SEGMENT accordingly.
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Table A1 - Cellular Uplink and Downlink Frequency Ranges
Cellular
Frequency
Band
F1
Soft
Key
F2
Soft
Key
Uplink Frequency
Range (MHz) Markers
1&2
Downlink Frequency
Range (MHz) Markers
3&4
A
810
910
824 – 847
869 - 892
B
810
910
835 – 849
880 - 894
A&B
810
910
824 – 849
869 - 894
Table A2 - PCS Uplink and Downlink Frequency Ranges
PCS
Frequency
Block
F1
Soft
Key
F2
Soft
Key
Uplink Frequency
Range (MHz) Markers
1&2
Downlink Frequency
Range (MHz) Markers 3
&4
A
1840
2000
1850 – 1865
1930 – 1945
B
1840
2000
1870 – 1885
1950 – 1965
C
1840
2000
1895 – 1910
1975 – 1990
D
1840
2000
1865 – 1870
1945 – 1950
E
1840
2000
1885 – 1890
1965 – 1970
F
1840
2000
1890 - 1895
1970 – 1975
Table A3 - GPS Uplink Frequency Ranges
GPS
Frequency
F1
Soft
Key
F2
Soft
Key
Uplink Frequency
Range (MHz) Markers 1
&2
Downlink Frequency
(MHz) Markers 3 & 4
-
1550
1600
1565.19 – 1585.65
Not Used
Table A4 – Lower 700 MHz Uplink and Downlink Frequency Ranges
Lower 700 MHz
Frequency Band
F1
Soft
Key
F2
Soft
Key
Uplink Frequency
Range (MHz)
Markers 1 & 2
Downlink Frequency
Range (MHz) Markers
3&4
A
690
760
698 – 704
728 - 734
B
690
760
704 - 710
734 - 740
C
690
760
710 - 716
740 - 746
A&B&C
690
760
698 - 716
728 - 746
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Table A5 – AWS Uplink and Downlink Frequency Ranges
AWS Frequency Band
F1 Soft Key
F2 Soft Key
Markers 1 & 2
Markers 3 & 4
A - uplink
1700
1765
1710 - 1720
Peak M1 & M2
A - downlink
2100
2165
2110 - 2120
Peak M1 & M2
B - uplink
1700
1765
1720 - 1730
Peak M1 & M2
B - downlink
2100
2165
2120 - 2130
Peak M1 & M2
C - uplink
1700
1765
1730 - 1735
Peak M1 & M2
C - downlink
2100
2165
2130 - 2135
Peak M1 & M2
D - uplink
1700
1765
1735- 1740
Peak M1 & M2
D - downlink
2100
2165
2135 - 2140
Peak M1 & M2
E - uplink
1700
1765
1740 - 1745
Peak M1 & M2
E - downlink
2100
2165
2140 - 2145
Peak M1 & M2
F - uplink
1700
1765
1745 - 1755
Peak M1 & M2
F - downlink
2100
2165
2145 - 2155
Peak M1 & M2
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A.2
Distance-to-Fault (DTF) Setup [2]
1. Press MODE.
2. Select DTF – RETURN LOSS.
3. Select DTF AID soft key.
4. Set D1 and D2 to desired points by using the CURSOR UP/DOWN to highlight
the corresponding section and press ENTER. Use keypad to enter value and
select ENTER.
D2 should be set to at least 20% farther than the known maximum
cable length.
5. Verify RES=130 pts {Greater than 300 feet. RES=517 pts}.
6. Set CABLE=LDF5-50A, LDF6-50A, or LDF7-50A, or equivalent, as desired.
7. Select CALIBRATION VALID – CONTINUE.
8. Press MARKER.
9. Select ALL OFF soft key.
10. Press SAVE SETUP.
11. Press UP/DOWN cursor control to select memory location.
12. Press ENTER.
A.3
Anritsu Sweep Software
The most recent Anritsu measurement software can be downloaded from the following
URL.
http://www.anritsu.com/Downloads/
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Appendix B – Tektronix NetTek® Setup and Calibration
Procedure
B.1
Return Loss Measurement Setup
1. Start the YBA250 application (if necessary).
2. Allow the instrument to warm up for at least 5 minutes.
3. Select the top, right button for Frequency Response Tests (Return Loss, VSWR, Cable
Loss).
4.
5. Select the channel standard.
6. Set the measurement type to Return Loss.
7. Set the measurement method to Normal (1024 points).
8. Enter the frequency range based on Tables B1-B3.
Table B1 - Cellular Uplink and Downlink Frequency Ranges
Cellular
Frequency
Band
F1
Soft
Key
F2
Soft
Key
Uplink Frequency
Range (MHz) Markers
1&2
Downlink Frequency
Range (MHz) Markers
3&4
A
810
910
824 – 847
869 - 892
B
810
910
835 – 849
880 - 894
A&B
810
910
824 – 849
869 - 894
Table B2 - PCS Uplink and Downlink Frequency Ranges
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PCS
Frequency
Block
F1
Soft
Key
F2
Soft
Key
Uplink Frequency
Range (MHz) Markers
1&2
Downlink Frequency
Range (MHz) Markers 3
&4
A
1840
2000
1850 – 1865
1930 – 1945
B
1840
2000
1870 – 1885
1950 – 1965
C
1840
2000
1895 – 1910
1975 – 1990
D
1840
2000
1865 – 1870
1945 – 1950
E
1840
2000
1885 – 1890
1965 – 1970
F
1840
2000
1890 - 1895
1970 – 1975
Table B3 - GPS Uplink Frequency Ranges
GPS
Frequency
F1
Soft
Key
F2
Soft
Key
Uplink Frequency
Range (MHz) Markers 1
&2
Downlink Frequency
(MHz) Markers 3 & 4
-
1550
1600
1565.19 – 1585.65
Not Used
Table B4 – Lower 700 MHz Uplink and Downlink Frequency Ranges
Lower 700 MHz
Frequency Band
F1
Soft
Key
F2
Soft
Key
Uplink Frequency
Range (MHz)
Markers 1 & 2
Downlink Frequency
Range (MHz) Markers
3&4
A
690
760
698 – 704
728 - 734
B
690
760
704 - 710
734 - 740
C
690
760
710 - 716
740 - 746
A&B&C
690
760
698 - 716
728 - 746
Table B5 – AWS Uplink and Downlink Frequency Ranges
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AWS Frequency Band
F1 Soft Key
F2 Soft Key
Markers 1 & 2
Markers 3 & 4
A - uplink
1700
1765
1710 - 1720
Peak M1 & M2
A - downlink
2100
2165
2110 - 2120
Peak M1 & M2
B - uplink
1700
1765
1720 - 1730
Peak M1 & M2
B - downlink
2100
2165
2120 - 2130
Peak M1 & M2
C - uplink
1700
1765
1730 - 1735
Peak M1 & M2
C - downlink
2100
2165
2130 - 2135
Peak M1 & M2
D - uplink
1700
1765
1735- 1740
Peak M1 & M2
D - downlink
2100
2165
2135 - 2140
Peak M1 & M2
E - uplink
1700
1765
1740 - 1745
Peak M1 & M2
E - downlink
2100
2165
2140 - 2145
Peak M1 & M2
F - uplink
1700
1765
1745 - 1755
Peak M1 & M2
F - downlink
2100
2165
2145 - 2155
Peak M1 & M2
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Note: The frequency can also be set automatically by pressing the uplink, downlink, or both
uplink and downlink frequency selection buttons.
9. Define the frequency mask (limit line) by:
a.
Select Tools > Mask Maker… from the menu.
b.
If necessary, delete the prior mask by pressing the delete mask button.
c.
If necessary, add a new single line trace by pressing the add trace button.
d.
Select the mask start and stop frequencies and enter the appropriate frequency range
{reference tableX, tableY, tableZ}
e.
Select the mask level and enter the appropriate level for the mask.
f.
Select the Save As… button to save the mask.
Note: it is recommended that the masks be saved by frequency band and antenna type. For
example: “Cell Band – Omni and AOA”.
g.
Enter the mask file name and press the Save button.
h.
Complete and use the mask by pressing the Done button.
10. Adjust the measurement reference levels by setting the reference manually or by pressing the
Auto Scale button.
11. Save the instrument setup:
12. Select Save > Setup from the menu.
13. Enter the setup name and select the Save button.
Note: it is recommended that setups be saved by frequency band and antenna type. For
example: “Cell Band – Omni and AOA”.
B.2
Distance to Fault (DTF) Measurement Setup
1. Start the YBA250 application (if necessary).
2. Allow the instrument to warm up for at least 5 minutes.
nd
3. Select the Distance to Fault button (2 button from the top right for DTF).
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4. Select the EDIT button.
You should now be at the Distance Options tab.
5. Select cable type. If you do not see the cable listed, select More and add the necessary cables
to the drop-down list.
6. Select Limit Bandwidth and enter the range (Stop Frequency – Start Frequency).
7. Enter in the Center Frequency which is the Start Frequency added to the Stop Frequency and
dividing by 2 (Stop Frequency + Start Frequency)/2.
8. Select the number of points desired under Method: Fast = 256 pts, Normal = 1024 pts, Long
Distance = 4096.
Note: depending on your configuration, all three choices may not be available
9. Double-check your values to the right of the screen.
10. If no changes, select OK.
11. Select the desired measurement: DTF Return Loss.
12. Save the instrument setup:
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a.
Select Save > Setup from the menu.
b.
Enter the setup name and select the Save button.
Note: it is recommended that setups be saved by frequency band and antenna type. For
example: “DTF Cell Band – Omni and AOA”.
B.3
Cable Loss Measurement Setup
1. Start the YBA250 application (if necessary).
2. Allow the instrument to warm up for at least 5 minutes.
3. Select the top, right button for Frequency Response Tests (Return Loss, VSWR, Cable Loss).
4.
5. Select the channel standard.
6. Set the measurement type to Cable Loss.
7. A Pop-up message will remind you to add an open or short to terminate the line. Select OK.
8. Set the measurement method to Normal (1024 points).
9. Enter the frequency range {reference Table 2}.
10. Adjust the measurement reference levels by setting the reference manually or by pressing the
Auto Scale button.
11. Save the instrument setup:
12. Select Save > Setup from the menu.
13. Enter the setup name and select the Save button.
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Note: it is recommended that setups be saved by frequency band and antenna type. For
example: “Cell Band – Omni and AOA”.
B.4
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Appendix C – Agilent FieldFox Setup Procedures
C1. Measure Return Loss
Return loss can be thought of as the absolute value of the reflected power as compared to the incident
power.
When measuring an OPEN or SHORT, all incident power is reflected and 0 dB return loss is displayed.
When measuring a LOAD, very little power is reflected and values of 40 dB to 60 dB are displayed.
1. Connect the Device Under Test (DUT), it can be cable or cable and antenna system.
2. Select Preset then Preset Returns the FieldFox to known settings.
3. Select Mode then CAT (Cable and Antenna Test)
4. Then Return Loss (Default measurement).
5. Press Freq/Dist and enter Start and Stop frequency values of the measurement.
6. Press Meas Setup 4 then Settings to make appropriate settings before calibrating.
7. Disconnect the DUT and press Cal 5 then follow the calibration prompts.
8. Reconnect the DUT (cable to be tested).
Optional
Add Markers – All Modes
Add Limits – All Modes
Save Settings and Data – All Modes
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C2. Measure Distance to Fault
Required Equipment:
LOAD with correct connector type and gender to terminate the end of the DUT.
Known length and cable type or Cable Loss (dB/Meter) and velocity factor of the DUT.
Optional phase stable jumper cable or adapter to connect the beginning of the DUT to the
FieldFox.
1. Connect any necessary jumper cable or adapter to the FieldFox RF OUT port.
2. Press Preset then Preset
3. Then Mode then CAT
4. Then Distance to Fault
5. Press Freq/Dist then Stop Distance and enter the length of the DUT.
6. If a diplexer or other filter is in the measurement path, press Freq/Dist then More, then select
Bandpass Mode ON and manually type the Center Freq and Max Span to test either the bandpass
or rejection capabilities of the filter.
7. Press Cal 5 and follow the Cal prompts.
8. Disconnect any components or antenna that should NOT be measured and connect a LOAD at the
end of the DUT.
9. Press Meas Setup 4 then DTF Cable Specifications.
10. Either press Recall Coax Cable or enter the Velocity Factor and Cable Loss of the DUT.
11. Connect the start end of the DUT to the FieldFox. The DTF measurement is displayed.
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C3. Measure Cable Loss (1-Port)
Required Equipment:
LOAD with correct connector type and gender to terminate the end of the DUT.
Optional phase stable jumper cable or adapter to connect the beginning of the DUT to the
FieldFox.
1. Press Preset then Preset
2. Then More then Cable Loss (1-Port)
3. Connect the DUT.
4. Press Freq/Dist and enter Start and Stop frequency values of the measurement.
5. Press Sweep 3 then Min Swp Time Increase the sweep time until a stable trace is visible on the
screen.
6. Press Cal 5 then follow the calibration prompts.
7. Connect the DUT (cable to be tested) to the FieldFox and connect a LOAD at the end of the DUT.
8. Press Trace 6 then Data->Mem to store the trace into Memory.
9. Remove the LOAD and leave the end of the DUT open.
10. Press Data Math then Data – Mem. The ripple in the measurement is removed.
11. Use Averaging for high-loss measurements. Press BW 2 then Averaging
Read Avg Cable Loss on the FieldFox screen
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C4. Calibration
Calibration is performed in CAT Mode.
A calibration is performed automatically when the FieldFox is powered ON and when Preset. This Preset
Cal (also known as CalReady) sets the reference plane at the RF OUT connector.
For highest accuracy, perform a QuickCal or O,S,L when any of the following occur:
The temperature changes significantly.
The Frequency Range, Resolution, Min Swp Time, or Power Level is changed.
When using a phase stable jumper cable or adapter to connect the DUT to the FieldFox. These
should be high-quality components.
Press Cal 5 then follow the prompts.
During a QuickCal, press Skip Load when NOT using a jumper cable or adapter.
Cal ON is shown on the screen when a Preset Cal is correcting the measurement.
Cal ON Q is shown on the screen when a QuickCal is correcting the measurement.
CAL ON U is shown on the screen when an O,S,L Cal is correcting the measurement.
When a calibration is being interpolated, an asterisk is added to the screen annotation as follows:
Cal ON*
A Normalization Cal is REQUIRED when making 2-port CAT or NA Mode measurements.
C5. Save and Recall Files
Save current settings and calibration, trace data (CSV) and .S1P), or a picture of the FieldFox screen.
Press Save/Recall 9
1. Then Select Device to set the LOCATION where the file is to be saved. Choose from the following:
Internal Saves/Recalls files to or from the FieldFox internal memory.
SD Card Saves/Recalls files to or from the mini SD card.
USB Saves/Recalls files to or from a USB Flash drive.
2. Then File Type
State Saves ALL FieldFox instrument settings and calibration for ALL Modes to an *.sta file.
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Trace + State Saves the current trace (all traces in SA mode) and instrument settings to an *.sta
file.
Picture Saves the FieldFox screen to a *.png file.
Data (S1P) Saves CAT and NA Mode trace data to an *.S1P file.
Data (CSV) Saves trace data from the current mode to a *.csv file.
3. Then press Save to save the specified file type to the specified device location.
4. Press Recall to read an *.sta file into the FieldFox.
C6. Agilent FieldFox Datalink Software
http://na.tm.agilent.com/fieldfox/
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Appendix D – Rohde & Schwarz FSH DTF Measurement
1. PRESS “MODE” HARDKEY
2. PRESS “MEAS MODE” SOFTKEY
3. PRESS “DISTANCE TO FAULT” SOFTKEY
4. PRESS “CABLE MODEL” SOFTKEY
5. USING THE SCROLL WHEEL OR UP\DOWN ARROWS, SELECT THE CABLE TYPE TO BE
MEASURED, THEN PRESS THE “SELECT” SOFTKEY.
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6. PRESS THE “CABLE LENGTH” SOFTKEY
7. ENTER THE LENGTH OF THE CABLE TO BE MEASURED (NOTE: ADD AN ADDITIONAL 1METER
TO THE CABLE LENTGH TO BE MEASURED).
NOTE: BEFORE PROCEEDING TO CALIBRATION, MAKE SURE TO ATTACH THE 1 METER TEST EXTENSION
CABLE TO PORT 1, AND PERFORM ALL CAL & MEASUREMENTS AT THE END OF THIS EXT CABLE.
8. PRESS THE “CALIBRATE” SOFTKEY
9. USING THE FSH-Z28 CAL TEE, FOLLOW THE SCREEN PROMPTS FOR CONNECTING THE
APPROPRIATE OPEN-SHORT-LOAD STANDARDS IN SEQUENCE WHEN ASKED, PRESSING
“CONTINUE” WHEN ASKED AFTER EACH STANDARD IS MEASURED.
10. WHEN THE OPEN-SHORT-LOAD CAL IS COMPLETE, LEAVE THE CAL TEE LOAD
CONNECTED TO THE TEST EXTENSION CABLE. YOU SHOULD SEE THE FOLLOWING TRACE.,
WHICH REPRESENTS VALIDATION OF THE CAL WITH A VERY LOW RETURN LOSS (>70dB) INTO
A 50OHM LOAD.
ND-00029
Rev. 5.2 6/21/2010
AT&T MOBILITY CONFIDENTIAL & PROPRIETARY
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Antenna System Sweep MOP
11. REMOVE THE LOAD STANDARD FROM THE END OF THE 1 METER TEST EXTENSION CABLE
AND CONNECT THE CABLE TO BE MEASURED. THIS SHOULD RESULT IN THE FOLLOWING
TRACE THAT REPRESENTS THE DTF MEASUREMENT OF THE CABLE UNDER TEST.
12. PRESS THE “MARKER” HARDKEY. THIS WILL PLACE A MARKER ON THE PEAK AND
INDICATE THE LARGEST FAULT OR REFLECTION OF THE CABLE UNDER TEST (WHICH IS LIKELY
THE LENGTH OF THE CABLE).
13. IF YOU HAVE ACCESS TO THE END OF THE CABLE BEING MEASURED, YOU CAN THEN
ATTACH THE LOAD STANDARD FROM THE CAL TEE TO THE END OF THE CABLE WHICH WILL
MATCH THE IMPEDANCE OF THE CABLE TO 50OHMS AND DROP THE RETURN LOSS AT THE
END OF THE CABLE DOWN 30 dB OR SO…VERIFYING A GOOD MATCH.
ND-00029
Rev. 5.2 6/21/2010
AT&T MOBILITY CONFIDENTIAL & PROPRIETARY
Use pursuant to Company instructions
Page 44 of 49
© 2010 AT&T
Mobility Network Services
Antenna System Sweep MOP
Appendix E - Typical Cable Loss Reference
E.1
E.2
Andrew
Cable Size
Model
attenuation
@ 900 MHz
[dB/100 ft]
attenuation
@ 2 GHz
[dB/100 ft]
1/4"
LDF1-50
3.911
6.097
1/2"
LDF2-50
3.313
5.172
3/8"
LDF4-50A
2.089
3.251
3/8"
FSJ4-50
3.38
5.37
7/8"
AVA5-50
1.08
1.68
7/8"
LDF5-50A
1.18
1.86
7/8"
VXL5-50
1.28
2.01
1 1/4"
LDF6-50
0.801
1.29
1 1/4"
VXL6-50
0.914
1.47
1 5/8"
AVA7-50
0.643
1.02
1 5/8"
LDF7-50A
0.694
1.131
1 5/8"
VXL7-50
0.694
1.13
2 1/4"
LDF12-50
0.601
0.994
Cable Size
Model
attenuation
@ 900 MHz
[dB/100 ft]
attenuation
@ 2 GHz
[dB/100 ft]
1/2"
CR-540
1.99
3.13
1/2"
FXL-540
2.06
3.19
1/2"
SFX-500
3.01
4.61
7/8"
FXL 1070-1
1.05
1.68
7/8"
FXL 780
1.12
1.74
7/8"
CR 1070
1.04
1.68
1 1/4"
CR 1480
0.775
1.26
1 1/4"
FXL 1480-1
0.784
1.24
1 5/8"
CR 1873
0.632
1.05
1 5/8"
FXL 1873
0.635
1.02
Commscope
ND-00029
Rev. 5.2 6/21/2010
AT&T MOBILITY CONFIDENTIAL & PROPRIETARY
Use pursuant to Company instructions
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© 2010 AT&T
Mobility Network Services
E.3
Eupen
D
E.4
Antenna System Sweep MOP
Cable Size
Model
attenuation
@ 900 MHz
[dB/100 ft]
attenuation
@ 2 GHz
[dB/100 ft]
1/4"
EC1-50
4.12
6.39
1/2"
EC2-50
2.975
4.603
3/8"
EC4-50
2.12
3.32
7/8"
EC5-50A
1.1
1.71
1 1/4"
EC6-50A
0.8
1.26
1 5/8"
EC7-50A
0.652
1.05
2 1/4"
EC12-50
0.611
1.028
Cable Size
Model
attenuation
@ 900 MHz
[dB/100 ft]
attenuation
@ 2 GHz
[dB/100 ft]
1/4"
SCF14-50
5.62
8.69
3/8"
LCF38-50
3.27
5.02
3/8"
SCF38-50
4.06
6.27
1/2"
LCF12-50
2.07
3.2
1/2"
SCF12-50
3.22
5.01
7/8"
LCF78-50JA
1.13
1.77
1 1/4"
LCF114-50JA
0.901
1.44
1 5/8"
LCF158-50JA
0.684
1.11
2 1/4"
LCF214-50JA
0.603
0.993
RFS
ND-00029
Rev. 5.2 6/21/2010
AT&T MOBILITY CONFIDENTIAL & PROPRIETARY
Use pursuant to Company instructions
Page 46 of 49
© 2010 AT&T
Mobility Network Services
Antenna System Sweep MOP
Appendix F – Exemplary Sweep Screenshots
F.1
Return Loss Sweep
F.1.1 Return Loss with 50-ohm load
F.1.2 Return Loss with short
ND-00029
Rev. 5.2 6/21/2010
AT&T MOBILITY CONFIDENTIAL & PROPRIETARY
Use pursuant to Company instructions
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© 2010 AT&T
Mobility Network Services
Antenna System Sweep MOP
F.1.3 Return Loss – complete system
F.2
Distance-to-Fault Sweep
F.2.1 Distance-to-Fault with 50-ohm load
ND-00029
Rev. 5.2 6/21/2010
AT&T MOBILITY CONFIDENTIAL & PROPRIETARY
Use pursuant to Company instructions
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© 2010 AT&T
Mobility Network Services
Antenna System Sweep MOP
F.2.2 Distance-to-Fault with short
F.2.3 Distance-to-Fault – complete system
ND-00029
Rev. 5.2 6/21/2010
AT&T MOBILITY CONFIDENTIAL & PROPRIETARY
Use pursuant to Company instructions
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© 2010 AT&T
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