Wegener DR95 Manuale utente
Instruction Manual
MODEL DR95/DR96
DIGITAL AUDIO SCPC RECEIVER
Data, drawings, and other material
contained herein are proprietary to
Wegener Communications, Inc., and
may not be reproduced or duplicated in
any form without the prior permission of
Wegener Communications, Inc.
When ordering parts from Wegener
Communications, Inc., be sure to include
the equipment model number, equipment
serial number, and a description of the part.
In all correspondence with Wegener
Communications, Inc., regarding this
publication, please refer to
DR95-/DR96-001C.
First edition: December 1995
Revised: June 1998
WEGENER
COMMUNICATIONS
R
TECHNOLOGY PARK / JOHNS CREEK
11350 TECHNOLOGY CIRCLE
DULUTH, GEORGIA 30097-1502
(770) 814-4000 FAX (770) 623-0698
DR95/DR96-001 ii
THIS PAGE INTENTIONALLY BLANK
iii DR95/DR96-001
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK,
DO NOT REMOVE COVER (OR BACK).
NO USER-SERVICEABLE PARTS INSIDE.
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.
CAUTION
As this unit is intended to interface with other electrical/electronic systems, proper
engineering practices must be adhered to during installation and check-out.
All AC power and ground must be installed in accordance with National Electric
Code Standards as to conductor size and limitations (see NFPA 70, articles 200-
280, as amended, if required), and lightning protection must be provided.
All RF interconnections must be properly shielded to prevent ingression or
egression of potential interfering sources to existing services.
Any damage to this unit caused by improper wiring/interconnections will void any
warranty extended.
The following warranty applies to all Wegener Communications products.
All Wegener Communications products are warranted against defective materials and workmanship for
a period of one year after shipment to customer. Wegener Communications' obligation under this
warranty is limited to repairing or, at Wegener Communications' option, replacing parts, subassemblies,
or entire assemblies. Wegener Communications shall not be liable for any special, indirect, or
consequential damages. This warranty does not cover parts or equipment which have been subject to
misuse, negligence, or accident by the customer during use. All shipping costs for warranty repairs will
be prepaid by the customer. There are no other warranties, express or implied, except as stated
herein.
WARRANTY
DR95/DR96-001 iv
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v DR95/DR96-001
TABLE OF CONTENTS
SECTION 1
GENERAL INFORMATION
Paragraph Page
1.1 INTRODUCTION...........................................................................................1-1
DR95/DR96-001 vi
3.1 ACQUISITION MODES................................................................................3-1
3.1.1 Installation Mode...................................................................................3-1
3.1.2 Tracking Mode......................................................................................3-3
3.1.3 Fade Mode.............................................................................................3-3
3.1.4 Carrier Table Search Mode ...................................................................3-3
MODETS i.......................................................................................3-5 -3
vii DR95/DR96-001
APPENDIX A
TECHNICAL SPECIFICATIONS
APPENDIX B
TERMINAL COMMANDS
B-1 CONTROL COMMANDS ................................................................................B-1
B-2 REPORTING COMMANDS.............................................................................B-6
B-3 HELP COMMANDS .........................................................................................B-12
TABLE OF CONTENTS – Continued
LIST OF ILLUSTRATIONS
Figure Page
1-1 Addressable Digital Audio SCPC Transmit and Receive Systems....................1-2
2-1 Model DR95-1X Digital Audio SCPC Receiver, Front and Rear View............2-2
2-2 Model DR96-1X Digital Audio SCPC Receiver, Front and Rear View............2-3
2-3 DR95-1X/DR96-1X Serial Cables to Printer or Terminal.................................2-6
2-4 DR95-1X/DR96-1X Serial Cables to Computer................................................2-7
2-5 DR95-1X/DR96-1X Serial Cables to Telephone Modem..................................2-8
3-1 Acquisition Mode, DR95-1X/DR96-1X Digital Audio SCPC Receiver...........3-2
LIST OF TABLES
Table Title Page
1-1 DR95-1X/DR96-1X Applications Data Chart ...................................................1-2
2-1 Model DR95-1X/DR96-1X Digital Audio SCPC Receiver,
Interconnect Descriptions stems....................................................................2-5
2-2 Recommended LNB Converter Specifications ..................................................2-6
2-3 Demodulator Data Output, RS422.....................................................................2-8
2-4 Control Data, RS232, Connector Pin-Out.........................................................2-9
2-5 External MPEG Input, RS422, Connector Pin-Out............................................2-9
2-6 DIP Switch Settings and Their Functions ..........................................................2-13
DR95/DR96-001 viii
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DR95/DR96-001 1-1
SECTION 1
GENERAL INFORMATION
1.1 INTRODUCTION
The purpose of this manual is to describe the proper installation and operation of the Wegener
Communications Model DR95-1X and DR96-1X Digital Audio Single Channel Per Carrier
(SCPC) Receivers. The DR95-1X and DR96-1X receivers are used in satellite-based digital
audio broadcast networks to deliver audio and data to the receive locations (downlinks). For the
remainder of this manual, the DR95-1X and Model DR96-1X receivers will be referenced as the
Model DR95-1X/DR96-1X receivers except where the differences between the units are
described.
1.2 SYSTEM DESCRIPTION
The Wegener digital audio system is a broadcast audio system using the ISO MPEG compression
technique. At the transmit site (uplink) analog audio is applied to an MPEG encoder where it is
digitized, compressed, and multiplexed with auxiliary data. The auxiliary data is a packetized
data stream containing carrier identification “tags,” network control commands (in addressable
networks), and user data. The resultant aggregate data stream is forward error corrected (FEC)
using rate 1/2 coding. The data rate is dependent on the analog audio bandwidth and the selected
encoder mode of operation (refer to table 1-1 below). The data rate is not agile. However,
receivers in the network will follow the encoder automatically as it is changed between mono,
dual mono, and joint stereo modes of operation. After FEC encoding the data stream is BPSK
(bi-phase shift keyed) modulated and upconverted to the final satellite uplink frequency.
TABLE 1-1. DR95-1X/DR96-1X APPLICATIONS DATA CHART
Channel
Spacing
(kHz)
Data
Rate
Transponder
6dB Occupied
Bandwidth
(kHz)
160
240
320
480
640
200
300
400
600
800
64
96
128
192
256
Maximum
Control
Channel
Data Rate
(bps)
4800
4800
9600
9600
9600
Dual
Mono
8.2
10.5
10.5
20
20
Maximum Audio BW (kHz)
Mono
8.2
20
20
20
20
Joint
Stereo
8.2
12.5
20
20
20
*
* Recommended
DR95/DR96-001 1-2
At the receive site, a dish antenna recovers the signal and couples it to an LNB (low-noise block
downconverter). The LNB amplifies and downconverts it to L-band (950 to 1450 MHz). This L-
band signal is carried by coaxial cable (possibly through in-line amplifiers) to the DR95-
1X/DR96-1X. The DR95-1X/DR96-1X reverses the process described above thereby
reconstructing the original data and analog audio.
In an addressable network, the DR95-1X/DR96-1X is controlled by commands embedded in the
auxiliary data stream. These commands use a highly flexible addressing structure for targeting
commands and data to remote sites. All Wegener remote modules use a standard transmission
protocol which simplifies network expansion. Receive sites may be controlled individually, by
assigned group, or globally. Groups are defined at the uplink and receive sites may be assigned
to multiple groups.
Figure 1-1. Addressable Digital Audio SCPC Transmit and Receive Systems
WEGENER
COMMUNICA
TIONS
AUDIO
AMPLIFIER
L-Band
DR95 Digital
Audio Receiver
RECEIVE SYSTEM
Terminal, Serial Printer, or Phone Line Modem
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