User's Manual
Table Of Contents
- High Power
- Wideband Radio Head (WRH-V)
- Table of Contents
- Chapter 1 - Product Description
- Chapter 2 - Controls, Indicators and Connectors
- Chapter 3 - Installation
- Chapter 4 - Maintenance
- Chapter 5 - Specifications
- Appendix A - Block Diagrams
- Chapter 1 Product Description
- Introduction
- Scope of Manual
- Safety
- Overview
- Figure 1-1 Powerwave Wideband Radio Head (WRH)
- Chassis Design
- Wideband Amplifier PCBA (WBA)
- Multi-Carrier Power Amplifier PCBA (MCPA)
- Distribution PCBA (DIA)
- Figure 1-2 DIA PCBA
- Control Unit PCBA (CU)
- Figure 1-3 CU PCBA
- Low Noise Amplifier (LNA)
- Figure 1-4 LNA
- Duplex Filter (DPX)
- Fiber Optic Unit (FOU)
- Figure 1-5 FOU in WRH-V
- Fiber Optic Node (FON)
- Power Supply Unit (PSU)
- Remote Control Unit (RCU)
- Alarm Interface PCBA (ALI) and Remote Control Interface PCBA (RCI)
- Figure 1-6 WRH-V Sub Unit Locations
- Figure 1-7 Fiber Optic Star Configuration
- Figure 1-8 Multi-operator System
- Chapter 2 Controls, Indicators and Connectors
- Chapter 3 Installation
- Chapter 4 Maintenance
- Chapter 5 Specifications
- Appendix A Block Diagrams
High Power Wideband Radio Head (WRH-V) Commissioning
044-05251 Rev A 3-9
Passive Intermodulation (PIM) Testing
PIM is the non-linear effect of passive RF components in a desired RF transmission band. As higher per-
carrier transmit power levels are applied to duplexed passive RF networks, PIM becomes an increasingly
significant factor in potential receiver desensitization. A PIM tester may be used on the RF network prior to
turn-on and commissioning of the unit, but if a PIM tester is not available, the following may be used:
The following equipment is required to test for PIM:
❑ Anritsu Site eMaster or equivilent RF Spectrum Analyzer
❑ Agilent ESG4432B or equivilent Multi-Signal Generator (or commissioned BTS)
❑ Guarateed/calibrated PIM load capable of handling 20W composite power
❑ Low-PIM RF cable adaptors such as N-N female, Din male to N femaile, DIN-DIN, SMA-SMA
female, and N male to SMA female
❑ Installed and operational WRH-V unit
❑ Installed passive RF network under test
❑ Torque wrenches for DIN and N connectors
Two different types of setup are available, depeding on equipment availability and testing methods.
Figure 3-10 shows PIM testing with two carriers over one WRH-V, and Figure 3-11 shows PIM testing with
one carrier over each of two WRH-Vs.
Figure 3-10 PIM testing two carriers and one WRH-V
Figure 3-11 PIM testing one carrier over each of two WRH-Vs
The following PIM test uses the receive sensitivity and gain of the WRH-V under test to verify that the receive
path is free of PIM noise. For PIM to be a problem at a particular site, TX signals must exist such that their
products fall into the RX band using the formulae:
3
rd
order product = (2 * f
1
) - f
2
and
3
rd
order product = (2 * f
2
) - f
1
WRH-V
E4432B
SIG Gen
(
or BTS
)
E4432B
SIG Gen
(or BTS)
Load /
DAS
Σ
OCM
E4402B
Spec. An.
WRH-V
Under Test
E4432B
Sig Gen /
BTS 1
Load /
DAS
OCM
E4402B
Spec. An.
WRH-V
Hybrid
OCM
E4432B
Sig Gen /
BTS 2