DIGITAL RADIO GUIDE

SATELLITE TRANSMISSION - WORLDSPACE

Broadcasters using the service are able to uplink their programmes from either centralised hubs or via individual feeder links located in any of the uplink footprints of the 3 satellites. Whilst this ease of access for broadcasters is a plus feature, the low power single channel uplink with its large footprint could be vulnerable to jamming. There have not been any occurrences of jamming to either satellite in more than four years of continuous operation, and procedures are in place to handle such attempts.

Figure 5.2. WorldSpace Up-link Coverage

AmeriSpaceAfriSpaceAsiaSpace

Broadcasters using the WorldSpace system have the choice of using a low power uplink local to the studio (PFLS), or routing their service(s) to a remote, high power uplink (TFLS) site. This arrangement is possible by the use of Frequency Division Multiplex Access (FDMA) for the uplink.

When received at the satellite, the signals from a PFLS are ”assembled” by the on-board processors to form a broadcast multiplex. The arrangement will allow each of the three spot beams to downlink its own multiplex on the processed transponder. In short, the on- board processing simplifies the uplinking procedures.

The downlink for each beam uses Time Division Multiplex Access (TDMA) and the baseband processing on-board the satellite carries out the FDM to TDM conversion.

For its transmission system, WorldSpace uses a system it has developed itself (early in 1998, WorldSpace made details of the system available to the ITU-R and the system is now designated ITU-R System Ds). The WorldSpace decision to use time division multiplexing (TDM) provides a greater link margin (the extent to which the clear sky carrier to noise ratio exceeds the threshold for reception level) than would be available with a COFDM system such as Eureka 147 (T-DAB). A greater link margin can be used to serve a larger coverage area, but cannot overcome the problem of blockage, which is a fundamental problem for all satellite systems.

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Grundig Digital Radio manual WorldSpace Up-link Coverage

Digital Radio specifications

The Grundig Digital Radio represents a significant advancement in radio technology, combining aesthetics, functionality, and a user-friendly interface. As a pioneer in the audio and electronics industry, Grundig has successfully integrated modern digital capabilities into its traditional radio design, appealing to both nostalgic listeners and tech-savvy users.

One of the standout features of the Grundig Digital Radio is its versatility in reception. With DAB+ (Digital Audio Broadcasting) technology, users can enjoy a wide array of radio stations with superior sound quality, free from the hiss and interference commonly associated with analog broadcasts. The inclusion of FM and AM bands ensures that listeners are not limited, providing access to local stations that may not yet have transitioned to digital.

The Grundig Digital Radio is designed with ease of use in mind. Its intuitive interface, often featuring a clear LCD display, allows users to navigate through stations and settings effortlessly. Many models also include a built-in tuner that automatically scans and presets available stations, simplifying the setup process. For those who appreciate personalization, some variants come equipped with customizable presets, allowing users to save their favorite stations for quick access.

Portability is another key characteristic of the Grundig Digital Radio. Many models are lightweight and come with built-in handles, making them ideal for on-the-go listening, whether it's in the garden, on the beach, or during a picnic. Battery options, alongside mains power, ensure that users can take advantage of their radios wherever they choose.

In terms of sound quality, Grundig utilizes advanced audio technologies to deliver rich and clear sound. Enhanced bass responses and treble controls allow users to fine-tune their listening experience to match their preferences. Furthermore, many models feature additional inputs, such as AUX and USB ports, enabling users to connect their smartphones or other devices, expanding their audio options.

Other notable characteristics include built-in alarms and timers, which make the Grundig Digital Radio a versatile companion for daily routines. Some models even support Bluetooth connectivity, allowing for seamless streaming from a variety of devices.

In summary, the Grundig Digital Radio embodies the perfect blend of traditional radio appeal and modern digital technology, offering versatility, ease of use, superior sound quality, and portability to meet the diverse needs of today’s listeners. Its well-thought-out features and user-friendly design make it an excellent choice for anyone looking to enhance their audio experience.