Medium Wave SD line 25kW - product specification

OR 25 SD - TECHNICAL DATA
OPERATING CONDITIONS:
Power Supply 
Main voltage 3 x 400 V +5 %, -10 %, 4 wires
Power input (fm=1kHz/m=1) 49,3 kVA
Mains frequency 50 Hz or 60 Hz (as option)
Power factor ≥ 0.95
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Modulator input
Input impedance 2000 Ω balanced, standard, 600 Ω balanced, optional
Input level(for frn=1kHz,m=1) - 4 dBm + 10 dBm, adjustable in 0.5 dB(0 dBm = 0.775 V across 600 Ω)
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Transmitter Output
RF output load impedance 50 Ω unbalanced, standard, 1-5/8“ EIA Flange
60 Ω unbalanced, optional
Permissable VSWR s < 1.50
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Environmental Conditions
Temperature in transmitter hall +1 to +45°C
Max. altitude above sea level 2000m
Relative humidity <95%, non condensing
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ELECTRICAL CHARACTERISTICS:
Frequency range 525 kHz – 1605 kHz
RF Output Power 25 kW
Frequency stability ± 10 Hz, ± 2 Hz at typical conditions
Frequency source DDS Synthesizer
Modulation principle Pulse Duration Modulation
Postive peak modulation
capability
125 %
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Signal to Noise Ratio and Spurious Emission
Unweighted > 60 dB, Reference level m = 100 % fm=1 kHz sine, mains voltage sine
RF Harmonic and Spurious
Emission
< 50 mW (according to ITU)
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Carrier Shift and Overall Efficiency
Carrier shift at m = 90 % with fm = 1 kHz
sine-shaped and at constant mains voltage referred to the unmodulated carrier < 1 %
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Overall Efficiency
> 80 %
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Audio characteristics
Amplitude-Freq. Response 30 Hz to 10 kHz   ± 1 dB
Nonlinear Distortion 30 Hz to 10 kHz   < 1 %
The ratio of input to output as a function of modulation
depth up to m = 80 % does not differ by more than
 ± 0.5 dB
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Transmitter 25kW

25 kW MW Broadcast Transmitter OR 25 SD

The RIZ OR 25 SD is a member of the new series of RIZ totally solid state transmitters.
Reliable solid state technology provides enhanced overall efficiency and exceptional audio performance.
This RIZ solid state SD series continues a tradition of providing broadcasters superior value, performance and long term reliability.
The transmitter incorporates multiple protection systems which prevent failures due to atmospheric and man-made transient sources.
A maximum safety for operating and for the maintenance personnel is provided in compliance with the IEC 215 safety standards.
This transmitter, as well as all other RIZ transmitters, is designed in accordance with the IEC standards and ITU recommendations for this type of service.

  • Dual exciter section
  • Frequency agility (max tuning time 2 min)
  • Simple cost effective maintenance
  • Solid state hot-swap modules
  • FM-like audio performance
  • High overall efficiency
  • Compact design
  • Microprocessor, DSP and EPLD technology
  • Mobile or stationary versions available
  • Digital broadcasting compatibility (DRM)

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