SIEMENS WR SEND 50 K-04

GENERAL DESCRIPTION

50 kW Short Wave Broadcast Transmitter

The Siemens HF Transmitter type WR Send 50 K-04 with amplitude modulation operates with a carrier power of 50 kW. Being equipped with a synthesizer, it can be tuned to any frequency within the broadcasting bands of the frequency range.

The technical data and the safety precautions comply essentially with the standards of CCIR and ARD.

Features:

Power tubes cooled by vapor condensation
Pulse duration modulation, PDM (without modulation transformer)
Automatic re-start in case of interference
Fault memory
Logical monitoring
Power reduction for operation
Utilisation of silicon semiconductors in the prestages, blocking devices and power supplies
RF measuring outputs and demodulator
Crosspointer instrument for RF output power and VSWR
Removalbe trolley-like stages
Small dimensions
Simple installation and operation
Easy maintenance
Provided for remote control

photo Siemens WR Send 50 K-04 block diagram

TECHNICAL SPECIFICATIONS
Frequency range (i.e. all broadcasting bands within the frequency range of)	3,2 to 17,9 MHz or 4,75 to 26,1 MHz
Frequency stability	± 5 Hz
Power output	50 kW
Carrier shift	4% or less with 90% modulation at 1000 Hz
RF harmonic radiation	less than 50 mW
RF non-harmonic radiation	less than 70 dB
Type of transmission	A 3 E (Amplitude modulation, broadcasting, double-side band, band-width 9 or 20 kHz)
Output impedance	50 Ohms unbalanced
VSWR	less than 1 : 2
Audio input	600 or 2000 Ohms balanced
Input level	-4...+10 dBm
Audio frequency response	60... 100 Hz +2/-3 dB 100...4000 Hz ±1 dB 4000...5000 Hz ±2 dB
Audio frequency distortion	less than 3% at 60...5000 Hz with 80% modulation
Modulation capability	100%: 100...3000 Hz; 80%: 60...10000 Hz
Noise (unweighted)	50 dB or better
Noise (weighted)	60 dB or better
Power supply	three phases 380/220 V ±10%, 50 Hz ±5%
Max. power consumption	270 kVA (100% modulation)
Cos φ	0.9 or better
Total efficiency	≥ 55%
Tubes	2 tetrodes RS 2054 SK 3 tetrodes YL 1050
Dimensions (W x H x D)	4.0 m x 2.0 m x 1.8 m (transmitter) 0.8 m x 2.0 m x 1.8 m (HT transformer)
Specifications may change without notice

TUBE COMPLEMENT
RF stages		AF stages and modulator
Number	Type	Number	Type
1	RS 1084 CJ	1	RS 1084 CJ
1	RS 1072 C

THIS TYPE OF TRANSMITTER IS INSTALLED IN THE FOLLOWING COUNTRIES
	ITU	Country	ITU	Country
	AFG	AFGHANISTAN	BEN	BENIN
	BOT	BOTSWANA	BFA	BURKINA FASO
	MLI	MALI	YEM	YEMEN