Transradio Boosts Reliability of EFR Signal Service
BURG, Germany — Malfunction of a transmitting system can cause severe
damage in sensitive broadcast equipment, affecting reliability and performance.
To meet the specific requirements of communication services, Transradio realizes
transmitting systems offering redundancy of vital system components.
|The Antenna Tuning Unit at Burg
undertook the task of improving the operational stability of a communication service
provided by Europäischen Funkrundsteuerung GmbH (EFR) for energy management, lighting control,
smart metering and data services. The transmission from Burg, once one of the
biggest German broadcast radio stations, is now operated by Media Broadcast on
At the site, a
50 kW reserve Transradio TRAM transmitter automatically backs up the
main 100 kW TRAM transmitter in case of failure. Both transmitters are
very efficient and perform well and thus are used for LF time signal
The Burg antenna system comprises
a 324-meter/1,063-foot grounded lattice mast supporting a rhombic cage antenna
and a 210-meter/670-foot base insulated tube mast. The height of the tube mast,
originally designed for medium-wave broadcasting, is low compared to the LF
wavelength. High voltages appear at the mast base and cause unstable operation.
By changing the tube mast isolation design and using part of the uppermost guy
section as top-load capacitance, voltages at the mast base were reduced to less
than a half.
To maintain transmission of the signal in case of a disturbance in one
of the antennas or antenna tuning units, Transradio implemented a
sophisticated, customized antenna control and switchover system based on a programmable
logic controller. This system takes into account and covers all relevant
parameters of the transmitting installation, including status monitoring of safety
equipment such as UV detectors, access doors and earth grounds.
The antenna tuning unit
of the old cage antenna was replaced by a carefully shielded container equipped
with motor-driven grounding switches. After completing antenna modification, the
antenna tuning unit of the tube mast was upgraded for switchover and matched to
the changed base impedance. Properly adjusted spark gaps at all relevant positions
of the matching circuit protect the equipment against excess voltage when
For information, contact Michael Schmolke at
Transradio in Germany at 011-49-30-339781-305 or visit www.tsb-ag.de