RIZ TRANSMITTERS OR 500 K-01/A

GENERAL DESCRIPTION


500 kW SW BROADCASTING TRANSMITTER TYPE RIZ OR 500 K-01/A

BASIC CHARACTERISTICS AND USE

photo RIZ Transmitters OR 500 K-01/A The 500 kW SW broadcast transmitter type RIZ 500 K-01/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 500 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 and sequential control of the transmitter is based on 16-bit microcontroller INTEL 87 C 196 KC, "ALTERA" P.LD. and DSP (TMS 320)

FEATURES

The transmitter has the following features:

* operation at any frequency within the short wave band between 3.9 and 26.1 MHz

* one tube only

* completely solid state modulator

* high efficiency (modulator 97%)

* 30 sec max. tuning time

* microprocessor, PLD and DSP technology

* two graph displays for tuning and sequential control

* extremely compact design

* ISO standards in progress

* quick and simplified installation

* easy front and rear access

* Carrier Control Modulation (CCM) 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 3 x 11 kV, +5% -10%
Power input (fm=1kHz/m=1) 11280 kVA
Mains frequency 50 Hz or 60 Hz (as option)
Power factor cos phi greater than 0,9
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) 8 dBm ± 10 dBm
Transmitter Output
RF output load impedance 50 ohm unbalanced, 300 ohm balanced
Permissible VSWR s less than 2 at 50 ohm unbalanced
s less than 1.7 at 300 ohm balanced
Climatic Conditions
Temperature in transmitter hall +5 to +45 C
Max. altitude above sea level 2000 m
Relative humidity less than 95 %
ELECTRICAL CHARACTERISTICS
Frequency Range
Frequency range 5.9 - 26.1 MHz (3.9 - 26.1 Mhz as option)
RF Output Power
Output power in the range 500 kW
Frequency stability 10-8 Hz/day
Type of modulation High level plate modulation
Modulation principle SSDM
Type of emission DSB 9A3, DSB 15A3
As option: DSB with CC (Carrier Control Modulation), SSB
Modulation Characteristics
Max. permitted ratio of input to output as function of modulation depth up to m=80% ±0.5 dB
Signal to Noise Ratio
Unweighted less than 55 dB
Weighted less than 60 dB
Reference level m=100% fm=1 kHz, sine shaped, mains voltage sine shaped
RF Harmonic and Spurious Radiation
RF harmonic and spurious radiation -70 dB to -80 dB
Carrier Shift
Carrier shift at m=95% with fm=1 kHz sine shaped and
at a constant mains voltage referred to the unmodulated carrier		 less than 4%
Overall efficiency
Carrier with 0 - 100% modulation more than 70%, typ. 73%
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 RS 2078 SK or TH558 or 4CM500,000G

1 3CW20,000A7



THIS TYPE OF TRANSMITTER IS INSTALLED IN THE FOLLOWING COUNTRIES

ITU Country
ITU Country