User manual

1-2 Section 1: System Features and Specifications
Moseley SL9003Q 602-12016 Revision G
1.1 System Introduction
The Moseley STARLINK 9000 is the first all-digital, open-architecture, modular system
for CD-quality audio transmission. The versatility and power of the STARLINK 9000
comes from a complete range of “plug and play” personality modules.
The SL9003Q Digital Studio-Transmitter Link (DSTL) provides a transmitter/receiver pair
that conveys high quality digital audio, either discrete or composite audio program
information, across a microwave radio path. Typically, program material is transmitted
from a studio site to a remote transmitter site, to a repeater site, or in an intercity relay
application.
Utilizing spectrally efficient digital Quadrature Amplitude Modulation (QAM) technology,
the SL9003Q delivers either four discrete 16-bit linear audio channels with two data
channels or a 16-bit linear stereo composite channel with up to three data channels over
standard FCC Part 74 (950 MHz) STL frequency allocations.
As a discrete STL, the AES/EBU digital audio I/O, combined with a built-in variable
sample rate converter, provide seamless connection to the all-digital air chain without
compression. The system has provisions for two asynchronous auxiliary data channels
(up to 38,400 baud) that are used for communication in remote control applications.
Plug-in MPEG audio modules and a digital multiplex allow for additional program, voice,
FSK, async and sync data channels.
As a composite STL, the stereo I/O allows transparent analog-composite transmission
directly from the audio processor/stereo generator at the studio site to the FM exciter at
the transmitter site. The analog composite signal is digitized and transmitted digitally
providing both error-free RF performance and significant sonic benefit; near flawless
channel response that exceeds most generation equipment, ultimate stereo separation,
dynamic range, and virtually no low-end frequency overshoot. The digital composite
STL operates similar to a traditional analog composite STL, such as the Moseley PCL-
6000 and PCL-606C series, and can directly replacement an existing analog composite
STL (with special considerations for mixed analog-STL/digital-STL hot-standby
configurations – see appendix).
The high spectral efficiency of the SL9003Q is achieved by user-selectable 16, 32, 64 or
128 QAM. Powerful Reed-Solomon error correction with interleaving, coupled with 20-
tap adaptive equalization, provide unsurpassed error-free signal robustness in hostile RF
environments for which there is no comparable benefit in analog transmission.