OPA 8500
Operating manual
Output amplifier
Version 1.0
Print: September 2000
BH_8300E
HIRSCHMANN
Description
General
The Output amplifier OPA 8500 amplifies TV/QAM/FM signals, which are present on the
inputs of the OPA 8500. The OPA 8500 supplies the following coaxial or optical
downstream distribution system with the amplified signals.
The RF-output, RF-inputs and two RF-monitoring outputs operate in the frequency
range 47 ... 862 MHz. The OPA 8500 is built with two parallel hybrids. Two equivalent
mains connections are available via the rear-panel.
The OPA 8500 is used in a combining network. The combining network consists of the
following functional groups:
l
RF-combiner RFC 8500/5
l
RF-combiner RFC 8500/4
l
1 HU Mounting frame MIO 8500 (for maximal 3 RF-combiners)
l
Output amplifier OPA 8500
The OPA 8500 has 10 RF-inputs and one RF-ouptut. The RF-inputs are meant:
l
for TV- or QAM-signals (4 RF-inputs)
l
for FM-signals (4 RF-inputs)
l
for pilot frequency signals or wobbler (2 RF-inputs)
OPA 8500
2 - 2 Output amplifier
Putting into operation
OPA 8500
Output amplifier 2 - 3
Putting into operation
MON.
Pilot or
Output amplifier OPA 8500
1
5
1
5
6
10
11
15
16
20
5x4
RFC 8500/4
RFC 8500/5
TV or QAM combining network
FM combining network
RFC 8500/4
RFC 8500/5
wobbler
RF
Example for a combining network
Design
View
The OPA 8500 is built asa1HU19"slide-in module.
The front-panel contains:
l
the display
l
the LED’s
l
the operating elements
l
two RF monitoring outputs
The rear-panel contains:
l
2 x mains connection
l
10 x RF input
l
RF output
l
RS232 interface
l
10 Mbit Ethernet-interface
l Remote monitoring interface ”ALARMS”
Cooling The SAI 8500 is cooled by convection.
Power supply
The OPA 8500 can be operated with the following mains voltages:
l
115 VAC
l
230 VAC
The power supply is of redundant design. For back-up purposes there are two mains
connectors available on the rear-panel. The OPA 8500 can be integrated into a back-up
supply system.
ATTENTION: Before operation make sure that the mains voltage matches the
supply voltage indicated on the device.
The mains fuse is located beside the mains socket. The OPA 8500 does not have a
mains switch. To disconnect the OPA 8500 from the mains, both mains plugs must be
pulled out of the device. Both mains voltages (mains 1, mains 2) can be monitored
through alarm messages.
OPA 8500
2 - 4 Output amplifier
Putting into operation
Output amplifier OPA 8500
Control
General For controlling there are the following possibilities:
l
Keypad and display on the OPA 8500 (see chapter ”Menu operation”)
l
10 Mbit Ethernet-interface (Software option “Network Access Control”)
l
RS 232 Interface for stand-alone devices (Software option “Network Access
Control*)
Remote control in a
network
(software option)
The OPA 8500 can be remote controlled via the Ethernet interface or RS232 interface.
A standard WWW-browser with TCP/IP protocol (e.g. Internet Explorer) is to be used.
The remote control can be disabled on the OPA 8500.
Monitoring
General For monitoring there are the following possibilities:
l
keypad and display
l
LED’s “ f ” and “OUT” (see interfaces and operating elements)
l
Monitoring outputs “RF m”
l
10 Mbit Ethernet-interface (Software option “Network Access Control”)
l
RS 232 interface for stand-alone devices (Software option “Network Access
Control”)
l
Remote monitoring interface ”ALARMS”
l
History / operation log (see menu operation)
l Status display (see menu operation)
Remote monitoring
interface ”ALARMS”
On the remote monitoring interface ”ALARMS” the status messages ”ALARM” and
”WARNING” are signalled via two floating double-throw contacts.
To the floating double-throw contacts external error indicators ( e.g. siren, lamp) can be
connected. The pin-assignment is shown in the section ”Interfaces and operating
elements”.
OPA 8500
Output amplifier 2 - 5
Putting into operation
Amplifier
The amplifier consists of two parallel hybrids (Amplifier A, Amplifier B). The current
consumption and the temperature of both hybrids are monitored. For monitoring the
temperature an alarm and warning threshold can be set. The nominal temperature
range of the amplifier is -10
o
Cupto+55
o
C.
Block diagram
OPA 8500
2 - 6 Output amplifier
Putting into operation
RF 5 e
RF 3 e
RF 7 e
RF 9 e
RF 2 e
RF 6 e
RF 4 e
RF 8 e
RF 10 e
RF OUT m
RF OUT m
Amplifier A
Amplifier B
RF 1 e
Output amplifier
Pilot
frequency
FM signals
Wobbler or
TV signals
or
QAM signals
RF a
OUT
LCD/
Keyboard
RS 232
Alarms
Ethernet
Monitoring/
Control
Power Supply
Mains 1
230/115 VAC
Mains 2
230/115 VAC
General data
Nominal temperature range : +5 ... +50
o
C
Operating temperature range : -10 ... +55
o
C
Storage temperature range : -20 ... +70
o
C
Cooling convection
Dimensions (WxDxH) :483x490x44mm
(19" main frame with 1 HU)
Mounting depth without cabling : 450 mm
Weight : max. 9 kg
Connection
Mains : 2 x compact mains plug
RF-output : BNC-socket, 75 ohm
RF-input : BNC-socket, 75 ohm
RF-monitoring output: : BNC-socket, 75 ohm
Interfaces “Alarms” : Sub-D socket 9 pole
Interfaces “RS 232” : Sub-D socket, 9 pole
10 MBit Ethernet interface : RJ-45 connector
Technical data
Power supply Mains supply:
at 115 V : 97 ... 132 VAC
at 230 V : 195 ... 264 VAC
Mains frequency: : 48 ... 63 Hz
Mains fuses:
at 230 V : 0,8 A slow
at 115 V : 1,6 A slow
Power consumption at nominal load: : max. 24 W
EMC : EN 50083-2/A1 edition 9/95 +
A1 edition 3/97
Safety standard : EN 60950 (edition 1997)
OPA 8500
6 - 2 Output amplifier
Appendix
Input RF/FM-input “RF1 e … RF10 e”:
Type / Impedance : BNC-socket / 75 ohm
Frequency range : 47 MHz … 862 MHz
Decoupling : typ. > 20 dB
Return loss : > 16 dB
Pilot-inputs
Type / impedance :BNC-socket / 75 ohm
Frequency range : 47 MHz … 862 MHz
Return loss : > 16 dB
Output RF-output “RF a”:
Type / Impedance : BNC-socket / 75 ohm
Frequency range : 47 MHz ... 862 MHz
Return loss : ≥ 16 dB
Nominal level
TV analog : 95 dBµV
DTV (256 QAM) : 91 dBµV
DTV (64 QAM) : 85 dBµV
FM :85…91dBµV
Gain TV : 9,5 dB ± 1 dB (47 MHz)
12 dB ± 1 dB (862 MHz)
FM :3dB ± 1dB
Pilot : -12,5 dB ± 1dB
Monitoring outputs RF-monitoring outputs “RF OUT m -20 dB”
Level (acc. to RF-output) : -20 dB ± 1dB
Impedance : 75 Ohm
RF combiner RF-input, RF-output : BNC-socket / 75 ohm
Frequency range : 47 MHz … 862 MHz
OPA 8500
Output amplifier 6 - 3
Appendix
Interfaces RS232: Pin-assignment : (see “Putting into operation \ Interfaces”)
NOTE: In order to meet the EMV-requirements a shielded cable must be
used with the RS 232 interface.
Ethernet:
10 Mbit interface “10 BASE-T”
Pin-assignment : see “Putting into operation \ Interfaces”
MPEG interface (option) : see “Putting into operation \ MPEG interface”
Remote monitoring interface “ALARMS”:
Max. switched voltage : 30 VDC or 42 VAC *(SELV acc. to EN60950)
Max. switched current : 0,5 A
Pin assignment : (see “Putting into operation \ Interfaces”)
*SELV....low voltage circuit (safety extra-low voltage)
OPA 8500
6 - 4 Output amplifier
Appendix
/