- Transmitter - Short Wave 50kW
Transmitter - Short Wave 50kW - product specification
| OR 50 K-04/A - TECHNICAL DATA | |
| OPERATING CONDITIONS: | |
| Power Supply | |
| Main voltage | 3 x 400 V ± 10 %, 4 wires |
| Power input (fm=1kHz/m=1) | 113 kVA, max |
| Mains frequency | 50 Hz or 60 Hz (as option) |
| Power factor | ≥ 0.95 |
 |
|
| Modulator input | |
| Input impedance | 600 /2000 Ω balanced, as standard |
| Input level(for fm=1kHz,m=1) | -10 dBm to + 15 dBm |
|
|
| Transmitter Output | |
| RF output load impedance | 50 Ω unbalanced, 300 Ω balanced with balun as option |
| Permissable VSWR | < 2.0 |
|
|
| Environmental Conditions | |
| Temperature in transmitter hall | 0 °C to +45 °C |
| Max. altitude above sea level | 2000 m |
| Relative humidity | < 95 %, non condensing |
|
|
| ELECTRICAL CHARACTERISTICS: | |
| Frequency range | 3.9 - 18.0 MHz, 3.2 - 26.1 MHz as option |
| RF Output Power | 50 kW AM / 25 kW DRM |
| Type of modulation | High level plate modulation |
| Modulation principle | SSDM |
| Type of emission | DSB, DSB with CCM, DRM, Simulcast |
|
|
| RF Harmonic and Spurious Radiation | |
| < 60 dB | |
|
|
| Carrier Shift | |
| Carrier shift at m = 95 % with fm = 1 kHz ≤ 2 % | |
| sine, shaped and at constant mains voltage referred to the unmodulated carrier | |
|
|
| Overall Efficiency | |
| ≥ 70 % (typ. 72 %) with standard cooling system | |
| Carrier with 0 – 100 % modulation | |
| |
|
| Max. Tuning Time | ≤ 30 sec., 20 sec. typically |
|
|
| 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 % |
|
|
| Signal to noise ratio,unweighted | ≥ 55 dB, reference level m = 100 %, fm = 1 kHz |
|
|
Transmitter 50kW
50 kW SW Broadcast Transmitter OR 50 K-04/A
The 50 kW SW broadcasting transmitter type OR 50 K-04/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 operating mode is changed by pressing a button on the touch screen main menu.
The DRM Exciter / Modulator is integrated in the transmitter.
Multifunctional touch screen menu enables controlling of the transmitter and 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 50 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
- Large Touch Screen Display
- 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
