- Transmitter - Short Wave 250kW
Transmitter - Short Wave 250kW - product specification
| OR 250 K-02/A - TECHNICAL DATA | |
| OPERATING CONDITIONS: | |
| Power Supply | |
| Main voltage |
3 x 11 kV (3-24 kV on request) ± 10 %, 3 x 400 V / 230 V ± 10 %, 4 wires |
| Power input (fm=1kHz/m=1) | 530 kVA, max |
| Mains frequency | 50 Hz ± 5 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 | 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 | 5.9 - 26.1 MHz standard, 3.9 - 26.1 MHz optional |
| RF Output Power | 250 kW AM / 125 kW DRM (with 9 dB crest factor) |
| 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 = 100 % with fm = 1 kHz ≤ 3 % | |
| sine, shaped and at constant mains voltage referred to the unmodulated carrier | |
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| Overall Efficiency | |
| ≥ 70 %, (typ. 74 %) 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 | < 3.0 %, 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 250kW
250 kW SW Broadcast Transmitter OR 250 K-02/A
The 250 kW SW broadcasting transmitter type OR 250 K-02/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 250 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
