Transmitter - Short Wave 500kW - product specification

OR 500 K-01/A - TECHNICAL DATA
OPERATING CONDITIONS:
Power Supply 
Main voltage

3 x 11 kV (3-24 kV on request) ± 5 %,

3 x 400 V / 230 V ± 5 %,  4 wires

Power input (fm=1kHz/m=1) 1067 kVA, max
Mains frequency 50 Hz ± 2 Hz, or 60 Hz (as option)
Power factor ≥ 0.95
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Modulator input
Input impedance 600 / 2000 Ω balanced or unbalanced
Input level(for fm=1kHz,m=1) -10 dBm  to + 15 dBm
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Transmitter Output
RF output load impedance 50 Ω unbalanced, 300 Ω balanced with balun as option 
Permissable VSWR 2:1 or less for full power at 50 Ω unbalanced
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Environmental Conditions
Temperature in transmitter hall +1 to +45 °C
Max. altitude above sea level 2000 m
Relative humidity < 95 %, non condensing
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ELECTRICAL CHARACTERISTICS:
Frequency range 5.9 - 26.1 MHz standard, 3.9 - 26.1 MHz optional
RF Output Power 500 kW AM / 250 kW DRM
Type of modulation High level plate AM
Modulation principle SSDM
Type of emission DSB, DSB with CCM, DRM, Simulcast
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RF Harmonic and Spurious Radiation   
According to  the ITU radio regulations
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Carrier Shift
Carrier shift at m = 95 % with fm = 1 kHz      ≤ 2 %
sine, shaped and at constant mains voltage referred to the unmodulated carrier
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Overall Efficiency
≥ 70 %, (typ. 72 %) with standard cooling system
Carrier with 0 – 100 % modulation
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Max. Tuning Time ≤ 30 sec., 20 sec. typically
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Audio characteristics
Audio frequency response ± 1 dB, 50 Hz to 7.5 kHz, at m = 30 – 70 %,
Reference fm = 1 kHz
Total harmonic distortion < 3.5 %, 50 Hz – 7.5 kHz, at m = 30 – 80 %
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Signal to noise ratio,unweighted ≥ 56 dB, reference level m = 100 % fm = 1 kHz
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Transmitter 500kW

500 kW SW Broadcast Transmitter OR 500 K-01/A


The 500 kW SW broadcasting transmitter type OR 500 K-01/A is a member of the RIZ's newest generation of digital transmitters.

 

Transmitter is capable for standard amplitude AM, digital DRM or SIMULCAST modes of operation.

 

The DRM Exciter / Modulator is integrated in the transmitter. The operating mode is changed by pressing a button on control panel.

 

Multifunctional LCD displays enable monitoring of all relevant parameters.


With completely solid state modulator and one tube in RF output stage this transmitter is superior to any other standard transmitter in the 500 kW power range.

 

Transmitter is automatically tunable in SW broadcast bands from 3.9 - 26.1 MHz, typically within 20 seconds (max 30 sec.).

This transmitter, as well as all other RIZ SW transmitters in the power range 20 kW up to 500 kW, is designed in accordance with IEC standards and ITU recommendations for this type of service.

 

  • High overall efficiency
  • AM, AM / CCM, DRM, Simulcast operating modes
  • DRM Exciter / Modulator integrated in the transmitter
  • Three Multifunctional LCD displays enable monitoring of all relevant parameters
  • Automatically tunable in SW bands between 3.9 - 26.1 MHz
  • Completely solid state modulator
  • Only one tube in RF output stage
  • Simple and cost effective maintenance
  • Possibility of remote control and unattended operation

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