RFmondial has successfully tested alternative distribution using DAB rebroadcasting in the case of a disaster

Hanover, 02.09.2022 - RFmondial has successfully carried out a field test in Hanover under real conditions as part of the development of solutions for alternative distribution to DAB+ transmitters in the event of a disaster.

In the event of a failure of the distribution link (modulation lines) to digital radio transmit-ters (DAB+), a stable radio broadcasting provision to the population must be guaran-teed. As recent events have shown in the event of a disaster, broadcasting coverage in particular is an essential building block for informing citizens, since mobile phone net-works are usually the first to fail. In order to increase the reliability of the broadcast an alternative distribution must be used during standard link failure (land-based lines in the event of flooding or satellite reception in the event of storms).
For this purpose, RFmondial has developed a system that uses the regular air interface for the distribution, the so-called rebroadcasting. Those DAB+ transmitters that are no longer able to receive their standard link receive the program over the air from another DAB+ transmitter, convert it to a different frequency (channel) and transmit it again with a short time delay. This transmitted program is now received by one or more other DAB+ transmitters and broadcast again on a different frequency. This guarantees na-tionwide broadcasting coverage even in the event of a disaster. In addition, the control of the transmitters can as well be maintained via a data channel hidden in the DAB+ broadcast.
The RFmondial technology was developed and tested in a field test in Hanover. For this purpose, a multiple frequency network (MFN) was operated, with a DAB+ transmitter (channel 5A) serving as the basic network transmitter in Hanover Hemmingen and an-other DAB+ transmitter (channel 7C) serving as a transmitter in rebroadcasting mode in Hanover Nordstadt. In addition to testing the rebroadcasting technology, the suitability of DAB+ receivers for switching to the now changed transmission frequency (service follow) has been examined. Manufacturers of consumer and automotive receivers took the opportunity to test and, in some cases, improve their receivers with regard to re-broadcasting.
New developments by Plisch GmbH from Viernheim were used as DAB+ transmitter systems, which are equipped with various redundancies and thus ensure trouble-free operation. The complete product portfolio can be found at www.plisch.com.
A detailed project description can be requested from info@rfmondial.de.

RFmondial GmbH
Dr. Jens Schroeder
Appelstr. 9A
30167 Hannover

Tel.: 0511 330995-62
E-Mail: schroeder@rfmondial.de

www.rfmondial.com

RFmondial GmbH offers professional products and services for the digital broadcasting industry as well as other industries with the need for innovative hardware and software. Research, development and prototype implementation for transmitter, receiver, and monitoring technology as well as design services for various industries are part of the core business. With broad experience in various technological areas, world-wide mar-kets are served, "Made in Germany".

Founded in 1955, Plisch GmbH, headquartered in Viernheim, develops and produces radio transmitter systems for TV and radio for worldwide use. With more than 20,000 installations in over 60 countries, Plisch is significantly involved in the expansion of national DAB+ broadcasting networks and with a "German engineering mentality" is always an innovative pioneer, for example in the implementation of broadcasting stand-ards such as DVB-T/T2.

This release was published on openPR.