R&S®SR8000 Family of VHF FM Transmitters

Air-cooled transmitters for 100 W to 2.5 kW

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  • Übersicht

Kerndaten

  • Digital exciter with excellent spectral purity
  • RF parameters meeting or exceeding ETSI and ITU-R requirements
  • Compact 19" rack format

Kurzbeschreibung

The synthesizer-based digital exciter generates a frequency-modulated RF signal in the range from 87.5 MHz to 108 MHz. The exciter combines the outstanding specifications of first-rate analog exciters with the reliability of modern digital signal processing.

Features

  • Exciter based on the R&S®SU800
  • Power amplifier
  • Housing with integrated cooling
  • Power supply

Technische Daten

Frequency range 87.5 MHz to 108 MHz
Internal tuning menu-controlled in 10 kHz steps
Frequency drift <200 Hz/3 months

Kerndaten

  • Digital exciter with excellent spectral purity
  • RF parameters meeting or exceeding ETSI and ITU-R requirements
  • Compact 19" rack format
  • Transmitter for 2.5  kW in only eight height units
  • Integrated stereo coder
  • Transmitter remote control and monitoring via SNMP option and web interface
  • Integrated parallel remote-control interfaces
  • Solid-state broadband amplifiers with guard circuits and integrated harmonics filter
  • Very robust operation even with high VSWR
  • State-of-the-art MOSFET technology in power amplifiers
  • Passive standby and (n+1) standby possible
  • Easy operation via graphical display
  • Easy installation, startup and maintenance due to all-in-one box concept

Kurzbeschreibung

Exciter

The synthesizer-based digital exciter generates a frequency-modulated RF signal in the range from 87.5 MHz to 108 MHz. The exciter combines the outstanding specifications of first-rate analog exciters with the reliability of modern digital signal processing.

Analog AF signals as well as digital signals can be processed in line with the bit-serial AES/EBU protocol. Left/right, MPX, RDS or SCA signals can be used as modulation signals.

All signal processing including frequency modulation is performed digitally. By using powerful digital technology and state-of-the-art D/A converters, this exciter meets the high requirements for spurious and spectrum masks. The integrated stereo coder has its own deviation limiter.

All parameters such as transmit frequency, operating mode and modulation mode, as well as properties of the modulation interfaces can be set from menus via the transmitter control unit. The measurement results of the exciter parameters, the exciter state (e.g. operating hours, system events) and modulation data (e.g. frequency deviation, AF level) are evaluated and displayed. An error table supplements the monitoring functions.

Power amplifier

Owing to state-of-the-art MOSFET technology, the power amplifier features excellent efficiency and compact design. In the RF amplifier, the signal is increased to a power of approx. 100 W, 250 W, 500 W, 1000 W or 1300 W. The harmonics filter integrated in the amplifier ensures compliance with ETSI standards.

An amplifier controller not only monitors and evaluates protective functions (e.g. overtemperature switchoff, VSWR reduction), but also provides phase correction and controls the output power, thus preventing the amplifier from being overdriven if a transistor fails, etc. This ensures a long life for the individual transistors. Each amplifier is, therefore, self-monitoring and self-protecting.

All relevant operating parameters and fault messages are transferred to the transmitter control unit via a CAN bus interface.

Transmitter control unit

The transmitter control unit handles both internal and external communications, including all control functions. It is integrated on the exciter board. It provides a straightforward summary of the transmitter‘s current status on a display.

Internal communication with the connected components (e.g. amplifier) is handled via CAN bus. The control unit communicates with the external components via Ethernet.

All transmitter and/or amplifier parameters required for diagnostics are available locally as well as remotely via standard (IP) protocol and standard software (webbrowser/SNMP browser). This enables the transmitter status of unattended stations to be accurately evaluated, and any servicing that may be needed to be optimally prepared.

Housing with integrated cooling

Nineteen-inch housing is used for all power classes. The transmitters are air-cooled with internal fans. The surrounding air is drawn in from the front. It cools the modules via conducted channels, and is expelled at the back. The compact fans are extremely powerful and highly efficient.

The fans are monitored at all times and can be replaced during operation, thus making transmitter servicing much easier.

Each amplifier module contains an optimized, highly efficient heat sink. This in conjunction with the elaborate cooling concept ensures effective cooling with only small amounts of air.

The frequency-response-compensated directional coupler integrated in the transmitter and built-in lightning protection round out the R&S®SR8000 transmitter family.

Merkmale

  • At a glance

    The air-cooled R&S®SR8000 generation of FM transmitters covers a power range from 100 W to 2.5 kW.

    The transmitters include the following components:

    • Exciter based on the R&S®SU800
    • Power amplifier
    • Housing with integrated cooling
    • Power supply
    • Integrated transmitter control unit

    All transmitters feature outstanding technical parameters, an optimum cost/benefit ratio, extremely high reliability plus ease of servicing. They contain the engineering of the digital state-of-the-art R&S®SU800 exciter and include an integrated AES/EBU interface.

    The air-cooled 19" units are extremely compact. The 100 W transmitter occupies two height units, the 1000 W transmitter four height units, and the 2.5 kW transmitter only eight height units. The 2.5 kW transmitter consists of two modules. The first module contains the exciter functions, an amplifier with an integrated splitter and a power supply. The second module contains the second amplifier, the combiner, the absorber and a second power supply.

    The transmitter control unit handles internal and external communications, including all control functions, and displays the transmitter‘s current status in various languages on a display. All transmitter and amplifier parameters required for diagnostics can be retrieved locally as well as remotely via standard (IP) protocol and standard software (web browser, SNMP option). In addition, an integrated parallel remote-control interface for message signaling and commands is available.

    Both (n+1) standby and passive standby systems can be implemented.

    The transmitters comply with the R & TTE Directive 1999/5/EC and meet the following standards: EN 60215 for protection of personnel, EN 301489-1 and EN 301489-11 for EMC, EN 302018-1 and EN 302018-2 for RF requirements and ITU-R B.S450-3 for stereo emissions.

Technische Daten

Specifications
Frequency range 87.5 MHz to 108 MHz
Internal tuning menu-controlled in 10 kHz steps
Frequency drift <200 Hz/3 months
Center frequency offset at ±75  kHz frequency deviation typ. 0 Hz
Nominal frequency deviation adjustable from ±40 kHz to ±150 kHz
Deviation limitation adjustable from ±40 kHz to ±150 kHz
Max. frequency deviation ±150 kHz
Emission class F3E, stereo and mono
Stereo emissions in line with ITU-R BS.450-3
RF ouput
Nominal impendance 50 Ω
Nominal power VSWR up to 1:1.5
Audio input
Connector XLR
  L and R mode multiplex mode AES/EBU mode
Input impedance 600Ω or >2kΩ, balanced/unbalanced 110Ω, balanced
AF input level for nominal deviation -6 dBu to +12 dBu +5 dBu to +7 dBu -12 dBFS to 0 dBFS
Control interfaces, remote-control interfaces
Parallel remote-control interface integrated
TCP/IP HTTP, SNMP (option)
Auxiliary frequency
Pilot-tone frequency 19 kHz
Amplitude 1 V (VPP) + 0.1 V into 1 kΩ; unbalanced
Pilot-tone deviation 0 Hz to 15 Hz, adjustable in 100 Hz steps
Output BNC
General data
AC supply voltage 100 V to 240 V, single-phase; R&S®SR8100: 220 V to 240 V
AC supply frequency 50 Hz or 60 Hz
Permissible voltage variation ±10 %
Power ratio >0.9
Cooling air cooling by internal fans (surrounding air)
Operating temperature range +1°C to +45°C, upper limit decreased by +5°C per 1000 m above mean sea level
Storage temperature range -40°C to +70°C
Permissible relative humidity <95% at +26°C
Permissible external electric field strength <10V/m
Maximum installation altitude 2000 m above mean sea level
Ordering Information
  R&S®SR8010 R&S®SR8025 R&S®SR8050 R&S®SR8100 R&S®SR8130 R&S®SR8250A
 
Nominal output power 100 W 250 W 500 W 1000 W 1300 W 2500 W
Power range (load with VSWR = 1) 10 W to 100 W 125 W to 250 W 125 W to 500 W 250 W to 1000 W 325 W to 1300 W 625 W to 2500 W
Connector N, female junction 7-16 junction 7-16 junction 7-16 junction 7-16 junction 7-16
Dimensions (W × H × D)
without power cable
420 mm x
2 height units
x 510 mm
(16.54 in x
2 height units
x 20.01 in)
420 mm x
4 height units
x 590 mm
(16.54 in x
3 height units
x 23.23 in)
420 mm x
4 height units
x 590 mm
(16.54 in x
4 height units
x 23.23 in)
420 mm x
4 height units
x 590 mm
(16.54 in x
4 height units
x 23.23 in)
420 mm x
4 height units
x 590 mm
(16.54 in x
4 height units
x 23.23 in)
420 mm x
8 height units
x 590 mm
(16.54 in x
8 height units
x 23.23 in)
Amplifier 100 W 250 W 500 W 1000 W 1300 W 2 x 1300 W
Order No. 5300.9002.02 5300.9102.02 5300.9202.02 5300.9302.02 5300.9302.03 5300.9502.02
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