- Transmitter - Short Wave 20kW
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
