User manual
Table Of Contents
- User Manual
- Starlink SL9003Q
- Digital Studio Transmitter Link
- WARRANTY
- SL9003Q Manual Dwg # 602-12016-01 R: G Revision Levels:
- Using This Manual - Overview
- Section 1 System Features and Specifications
- Section 2 Quick Start
- Section 3 Installation
- Section 4 Operation
- Section 5 Module Configuration
- Section 6 Customer Service
- Section 7 System Information
- Table of Contents
- List of Figures
- List of Tables
- 1 System Features and Specifications
- 2 Quick Start
- 3 Installation
- 4 Operation
- 7.1 Introduction
- 7.2 Front Panel Operation
- 4.3 Screen Menu Navigation and Structure
- 7.4 Screen Menu Summaries
- 4.4.1 Meter
- 4.4.2 System: Card View
- 4.4.3 System: Power Supply
- 4.4.4 System: Info
- 4.4.5 System: Basic Card Setup
- 4.4.6 Factory Calibration
- 4.4.7 SYSTEM: UNIT-WIDE PARAMS
- 4.4.8 System: Date/Time
- 4.4.9 System: Transfer
- 4.4.10 System: External I/O (NMS)
- 4.4.11 Alarms/Faults
- 4.4.12 Radio: Modem Status (QAM)
- 4.4.13 Radio TX Status
- 4.4.14 Radio RX Status
- 4.4.15 Radio TX Control
- 4.4.16 Radio RX Control
- 4.4.17 Radio Modem (QAM) Configure
- 4.4.18 Radio TX Configure
- 4.4.19 Radio RX Configure
- 4.4.20 Radio Modem/TX/RX Copy Function
- 4.5 Intelligent Multiplexer PC Interface Software
- 4.6 NMS/CPU PC Interface Software
- 5 Module Configuration
- 6 Customer Service
- 7 System Description
- 8 Appendices
- Appendix A: Path Evaluation Information
- Appendix B: Audio Considerations
- Appendix C: Glossary of Terms
- Appendix D: Microvolt – dBm – Watt Conversion (50 ohms)
- Appendix E: Spectral Emission Masks
- Appendix F: Redundant Backup with TP64 and TPT-2 Transfer Panels
- Appendix G: Optimizing Radio Performance For Hostile Environments
- Appendix H: FCC APPLICATIONS INFORMATION - FCC Form 601
- Starlink SL9003Q & Digital Composite - 950 MHz Band
G-4 Appendix G: Optimizing Radio Performance for Hostile Environments
Moseley SL9003Q 602-12016 Revision G
QAM RATE
If you have found interference within your passband but you can’t change frequency, and you
can’t install larger antennae, then there is still another possibility that may help.
Lowering QAM mode will increase the receiver’s resistance to co-channel interference. The
lower QAM modes are more robust than the higher mode but at the expense of increased
bandwidth. For instance changing from 64 QAM to 16 QAM will improve sensitivity and co-
channel resiliency by 6 dB but will increase occupied spectrum by 33%. In general 16 QAM is
more robust against interference, microphonics, and impulse noise such as lightning.
To change QAM rate navigate to QAM RADIO –> CONFIGURE MODEM –> Mode/Effic. Switch
from 64Q/6 to 32Q/5 or to 16Q/4. It is imperative to match the QAM mode on both transmitter
and receiver or the system will not operate. Don’t forget to change both.
Note: When shipped from the manufacturer, the QAM mode is selected for optimal channel
utilization for the particular data rate that the link is using. Changing the transmission bandwidth
is left to the users discretion; exercise caution not to exceed Part 74 bandwidth allocation.
FRONT-END BANDPASS CONSIDERATIONS
The pre-selector filter that is shipped with the SL9003Q is a 5-pole inter-digital waveguide
bandpass filter. It has been optimize for lowest loss, high ultimate selectivity, and reasonable
cost. The bandpass is 20 MHz, which was designed to keep the loss consistent between the
inside and outside channel allocations. For most applications this pre-selector should provide
the best overall performance. But for extremely powerful near band interference such as pagers
this pre-selector may not provide adequate protection.
Moseley has a wealth of experience in specifying filters for resolving these types of interference
problem and can offer certain bandpass filters with high adjacent channel selectivity from stock.
Contact the broadcast sales manager for further details.