Transmitter - Short Wave 20kW - product specification

OR 20 K-03/A - TECHNICAL DATA
OPERATING CONDITIONS:
Power Supply 
Main voltage 3 x 400V ± 10 %,  4 wires
Power input (fm=1kHz/m=1) 53 kVA, max
Mains frequency 50 Hz or 60 Hz (as option)
Power factor ≥ 0.95
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Modulator input
Input impedance 600 /2000 Ω balanced, as standard
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 < 2.0
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Environmental Conditions
Temperature in transmitter hall 0 °C to +45 °C
Max. altitude above sea level 2000 m
Relative humidity < 95 %, non condensing
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ELECTRICAL CHARACTERISTICS:
Frequency range 3.2 - 18.0 MHz, 3.2 - 26.1 MHz as option
RF Output Power 20 kW AM / 10 kW DRM
Type of modulation High level plate modulation
Modulation principle Polyphase Pulse Duration Modulation
Type of emission DSB, DSB with CCM, DRM, Simulcast
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RF Harmonic and Spurious Radiation   
< 56 dB
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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
 60 % AM
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  55 dB, reference level m = 100 % fm = 1 kHz
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Transmitter 20kW

20 kW SW Broadcast Transmitter OR 20 K-03/A

The 20 kW SW broadcasting transmitter type OR 20 K-03/A is a member of 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 a completely solid state modulator and one tube in RF output stage this transmitter is superior to any other standard transmitter in the 20 kW power range.

 

Transmitter is automatically tunable in SW broadcast bands from 3.2 - 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 3.2 - 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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