RIZ TRANSMITTERS OR 50 K-02/A

GENERAL DESCRIPTION

50 kW SW BROADCASTING TRANSMITTER TYPE RIZ OR 50 K-02/A

BASIC CHARACTERISTICS AND USE

photo RIZ Transmitters OR 50 K-02/A

The 50 kW SW broadcast transmitter type RIZ 50 K-02/A is a member of the RIZ new generation of amplitude modulated transmitters. With completely solid state modulator and new approach for getting SSB signal this transmitter is superior to any other standard SW transmitter in the 50 kW power range.

Using DSP (Digital Signal Processing), and basic principles of Kahn System, the advanced SSB system is achieved and applied to C-class RF output amplifier, resulting in excellent overall transmitter efficiency.

This transmitter, as all other RIZ transmitters is designed in accordance with German ARD standards and CCIR recommendations.

The transmitter itself is constructed as a self-contained unit. All control and monitoring elements are installed on the front panel of the transmitter. Tuning, sequential control and audio processing of the transmitter are based on 16-bit microcontrollers, PLD-s and DSP-s.

FEATURES

The transmitter has the following features:

* operation at any frequency within the short wave bands between 3.2 and 26.1 MHz

* completely solid state modulator, adaptable encoding, fault tolerant

* high efficiency (modulator >95%)

* 30 sec max. tuning time

* microprocessor, PLD and DSP technology

* two graph displays for tuning and sequential control

* extremely compact design

* quick and simplified installation

* easy front and rear access

* Adaptable Carrier Control (ACC) in AM (A3) mode of operation (optional)

* SSB (optional)

* minimized exploitation and maintenance costs

* reliable operation in extreme climatic and environmental conditions

* possibility of remote control and unattended operation.

TECHNICAL SPECIFICATIONS
OPERATING CONDITIONS
Power Supply
Mains voltage	380V/220V 3-phase+neutral, +5% -10%
Power input (f_m=1kHz/m=1)	110 kVA, max
Mains frequency	50 Hz or 60 Hz (as option)
Power factor	> 0,95
Modulator Input
Input impedance	2000 Ohms balanced standard 600 Ohms balanced as option
Input level (for fm=1 kHz, m=1) (0 dBm 0.775V across 600 Ohms)	-10 dBm to +10 dBm
Transmitter Output
RF output load impedance	50 ohm unbalanced, 300 ohm balanced, as option
Permissible VSWR	s < 2 at 50 ohm unbalanced
Climatic Conditions
Temperature in transmitter hall	+1 to +45 °C
Max. altitude above sea level	2000 m
Relative humidity	< 95 %
ELECTRICAL CHARACTERISTICS
Frequency Range
Frequency range	3.2 - 26.1 MHz
RF Output Power
Output power in the range	50 kW carrier in A3 mode
Frequency stability	10^-8 Hz/day
Type of modulation	High level plate modulation
Modulation principle	SSDM
Type of emission	A3E (AM) H3E (SSB with -6dB carrier reduction, as option) R3E (SSB with -12dB carrier reduction, as option) DSB with ACC (as option)
Modulation Characteristics
Max. permitted ratio of input to output as function of modulation depth up to m=80%	±0.5 dB
Modulation capability: 50 Hz - 7.5 kHz	m=100% sine, continuous
Frequency response	±1 dB 50 Hz - 7.5 kHz, reffered to 70% - 1 kHz
THD + Noise	< 3.5% m=30% - 90%, f=50 Hz - 7.5 kHz
Modulator efficiency	> 95%, m=0-100%, f=50 Hz - 7.5 kHz
Signal to Noise Ratio
Unweighted	less than 55 dB Reference level m=100% fm=1 kHz,sinusoidal, mains voltage sinusoidal
RF Harmonic and Spurious Radiation
RF Harmonic and Spurious Radiation	< -60 dB
Carrier Shift
Carrier shift at m=95% with f_m=1 kHz sine shaped and at constant mains voltage referred to the unmodulated carrier	< 5%
Overall Efficiency
Carrier with 0 - 100% modulation	> 70%
Max. Tuning Time
Max. tuning time	30 sec.
Specifications may change without notice

TUBE COMPLEMENT
RF stages		AF stages and modulator
Number	Type	Number	Type
1	4CM100,000A/G

THIS TYPE OF TRANSMITTER IS INSTALLED IN THE FOLLOWING COUNTRIES
	ITU	Country	ITU	Country